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Article ; Online: Dissection of structural and functional requirements that underlie the interaction of ERdj3 protein with substrates in the endoplasmic reticulum.

Otero, Joel H / Lizák, Beata / Feige, Matthias J / Hendershot, Linda M

2014 Volume 289, Issue 40, Page(s) 27504–27512

Abstract: ERdj3, a mammalian endoplasmic reticulum (ER) Hsp40/DnaJ family member, binds unfolded proteins, transfers them to BiP, and concomitantly stimulates BiP ATPase activity. However, the requirements for ERdj3 binding to and release from substrates in cells ... ...

Abstract	ERdj3, a mammalian endoplasmic reticulum (ER) Hsp40/DnaJ family member, binds unfolded proteins, transfers them to BiP, and concomitantly stimulates BiP ATPase activity. However, the requirements for ERdj3 binding to and release from substrates in cells are not well understood. We found that ERdj3 homodimers that cannot stimulate the ATPase activity of BiP (QPD mutants) bound to unfolded ER proteins under steady state conditions in much greater amounts than wild-type ERdj3. This was due to reduced release from these substrates as opposed to enhanced binding, although in both cases dimerization was strictly required for substrate binding. Conversely, heterodimers consisting of one wild-type and one mutant ERdj3 subunit bound substrates at levels comparable with wild-type ERdj3 homodimers, demonstrating that release requires only one protomer to be functional in stimulating BiP ATPase activity. Co-expressing wild-type ERdj3 and a QPD mutant, which each exclusively formed homodimers, revealed that the release rate of wild-type ERdj3 varied according to the relative half-lives of substrates, suggesting that ERdj3 release is an important step in degradation of unfolded client proteins in the ER. Furthermore, pulse-chase experiments revealed that the binding of QPD mutant homodimers remained constant as opposed to increasing, suggesting that ERdj3 does not normally undergo reiterative binding cycles with substrates.
MeSH term(s)	Adenosine Triphosphatases/metabolism ; Animals ; COS Cells ; Chlorocebus aethiops ; Dimerization ; Endoplasmic Reticulum/chemistry ; Endoplasmic Reticulum/enzymology ; Endoplasmic Reticulum/genetics ; Endoplasmic Reticulum/metabolism ; HSP40 Heat-Shock Proteins/chemistry ; HSP40 Heat-Shock Proteins/genetics ; HSP40 Heat-Shock Proteins/metabolism ; Humans ; Kinetics ; Protein Binding ; Protein Folding ; Proteins/metabolism
Chemical Substances	DNAJB11 protein, human ; HSP40 Heat-Shock Proteins ; Proteins ; Adenosine Triphosphatases (EC 3.6.1.-)
Language	English
Publishing date	2014-08-20
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ZDB-ID	2997-x
ISSN	1083-351X ; 0021-9258
ISSN (online)	1083-351X
ISSN	0021-9258
DOI	10.1074/jbc.M114.587147
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Article ; Online: Large 1p36 Deletions Affecting Arid1a Locus Facilitate Mycn-Driven Oncogenesis in Neuroblastoma.

García-López, Jesus / Wallace, Kirby / Otero, Joel H / Olsen, Rachelle / Wang, Yong-Dong / Finkelstein, David / Gudenas, Brian L / Rehg, Jerold E / Northcott, Paul / Davidoff, Andrew M / Freeman, Kevin W

Cell reports

2019 Volume 30, Issue 2, Page(s) 454–464.e5

Abstract: Loss of heterozygosity (LOH) at 1p36 occurs in multiple cancers, including neuroblastoma (NBL). MYCN amplification and 1p36 deletions tightly correlate with markers of tumor aggressiveness in NBL. Although distal 1p36 losses associate with single-copy ... ...

Abstract	Loss of heterozygosity (LOH) at 1p36 occurs in multiple cancers, including neuroblastoma (NBL). MYCN amplification and 1p36 deletions tightly correlate with markers of tumor aggressiveness in NBL. Although distal 1p36 losses associate with single-copy MYCN tumors, larger deletions correlate with MYCN amplification, indicating two tumor suppressor regions in 1p36, only one of which facilitates MYCN oncogenesis. To better define this region, we genome-edited the syntenic 1p36 locus in primary mouse neural crest cells (NCCs), a putative NBL cell of origin. In in vitro cell transformation assays, we show that Chd5 loss confers most of the MYCN-independent tumor suppressor effects of 1p36 LOH. In contrast, MYCN-driven tumorigenesis selects for NCCs with Arid1a deletions from a pool of NCCs with randomly sized 1p36 deletions, establishing Arid1a as the MYCN-associated tumor suppressor. Our findings reveal that Arid1a loss collaborates with oncogenic MYCN and better define the tumor suppressor functions of 1p36 LOH in NBL.
MeSH term(s)	Animals ; Chromosome Deletion ; Chromosome Disorders/genetics ; Chromosomes, Human, Pair 1/genetics ; DNA-Binding Proteins/metabolism ; Humans ; Mice ; N-Myc Proto-Oncogene Protein/metabolism ; Neuroblastoma/genetics ; Transcription Factors/metabolism
Chemical Substances	Arid1a protein, mouse ; DNA-Binding Proteins ; MYCN protein, human ; N-Myc Proto-Oncogene Protein ; Transcription Factors
Language	English
Publishing date	2019-12-09
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2649101-1
ISSN	2211-1247 ; 2211-1247
ISSN (online)	2211-1247
ISSN	2211-1247
DOI	10.1016/j.celrep.2019.12.048
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Article ; Online: Life and death of a BiP substrate.

Otero, Joel H / Lizák, Beáta / Hendershot, Linda M

Seminars in cell & developmental biology

2009 Volume 21, Issue 5, Page(s) 472–478

Abstract: BiP is the mammalian endoplasmic reticulum (ER) Hsp70 orthologue that plays a major role in all functions of this organelle including the seemingly opposing functions of aiding the maturation of unfolded nascent proteins and identifying and targeting ... ...

Abstract	BiP is the mammalian endoplasmic reticulum (ER) Hsp70 orthologue that plays a major role in all functions of this organelle including the seemingly opposing functions of aiding the maturation of unfolded nascent proteins and identifying and targeting chronically unfolded proteins for degradation. The recent identification of mammalian BiP co-factors combined with delineation of the ER degradation machinery and data suggesting that the ER is subdivided into unique regions helps explain how these different functions can occur in the same organelle and raises some unresolved issues.
MeSH term(s)	Animals ; Endoplasmic Reticulum/metabolism ; HSP70 Heat-Shock Proteins/metabolism ; Humans
Chemical Substances	HSP70 Heat-Shock Proteins
Language	English
Publishing date	2009-12-21
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	1312473-0
ISSN	1096-3634 ; 1084-9521
ISSN (online)	1096-3634
ISSN	1084-9521
DOI	10.1016/j.semcdb.2009.12.008
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Article ; Online: ERdj4 protein is a soluble endoplasmic reticulum (ER) DnaJ family protein that interacts with ER-associated degradation machinery.

Lai, Chunwei Walter / Otero, Joel H / Hendershot, Linda M / Snapp, Erik

The Journal of biological chemistry

2012 Volume 287, Issue 11, Page(s) 7969–7978

Abstract: Protein localization within cells regulates accessibility for interactions with co-factors and substrates. The endoplasmic reticulum (ER) BiP co-factor ERdj4 is up-regulated by ER stress and has been implicated in ER-associated degradation (ERAD) of ... ...

Abstract	Protein localization within cells regulates accessibility for interactions with co-factors and substrates. The endoplasmic reticulum (ER) BiP co-factor ERdj4 is up-regulated by ER stress and has been implicated in ER-associated degradation (ERAD) of multiple unfolded secretory proteins. Several other ERdj family members tend to interact selectively with nascent proteins, presumably because those ERdj proteins associate with the Sec61 translocon that facilitates entry of nascent proteins into the ER. How ERdj4 selects and targets terminally misfolded proteins for destruction remains poorly understood. In this study, we determined properties of ERdj4 that might aid in this function. ERdj4 was reported to retain its signal sequence and to be resistant to mild detergent extraction, suggesting that it was an integral membrane protein. However, live cell photobleaching analyses of GFP-tagged ERdj4 revealed that the protein exhibits diffusion coefficients uncommonly high for an ER integral membrane protein and more similar to the mobility of a soluble luminal protein. Biochemical characterization established that the ERdj4 signal sequence is cleaved to yield a soluble protein. Importantly, we found that both endogenous and overexpressed ERdj4 associate with the integral membrane protein, Derlin-1. Our findings now directly link ERdj4 to the ERAD machinery and suggest a model in which ERjd4 could help recruit clients from throughout the ER to ERAD sites.
MeSH term(s)	Animals ; Cell Line ; Dogs ; Endoplasmic Reticulum/genetics ; Endoplasmic Reticulum/metabolism ; Endoplasmic Reticulum-Associated Degradation/physiology ; Intracellular Membranes/metabolism ; Membrane Glycoproteins/genetics ; Membrane Glycoproteins/metabolism ; Membrane Proteins/genetics ; Membrane Proteins/metabolism ; Mice ; Models, Biological ; Protein Sorting Signals/physiology ; Protein Transport/physiology
Chemical Substances	ERdj4 protein, mouse ; Membrane Glycoproteins ; Membrane Proteins ; Protein Sorting Signals ; derlin-1 protein, mouse
Language	English
Publishing date	2012-01-20
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ZDB-ID	2997-x
ISSN	1083-351X ; 0021-9258
ISSN (online)	1083-351X
ISSN	0021-9258
DOI	10.1074/jbc.M111.311290
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Article ; Online: Cancer Mutations of the Tumor Suppressor SPOP Disrupt the Formation of Active, Phase-Separated Compartments.

Bouchard, Jill J / Otero, Joel H / Scott, Daniel C / Szulc, Elzbieta / Martin, Erik W / Sabri, Nafiseh / Granata, Daniele / Marzahn, Melissa R / Lindorff-Larsen, Kresten / Salvatella, Xavier / Schulman, Brenda A / Mittag, Tanja

Molecular cell

2018 Volume 72, Issue 1, Page(s) 19–36.e8

Abstract: Mutations in the tumor suppressor SPOP (speckle-type POZ protein) cause prostate, breast, and other solid tumors. SPOP is a substrate adaptor of the cullin3-RING ubiquitin ligase and localizes to nuclear speckles. Although cancer-associated mutations in ... ...

Abstract	Mutations in the tumor suppressor SPOP (speckle-type POZ protein) cause prostate, breast, and other solid tumors. SPOP is a substrate adaptor of the cullin3-RING ubiquitin ligase and localizes to nuclear speckles. Although cancer-associated mutations in SPOP interfere with substrate recruitment to the ligase, mechanisms underlying assembly of SPOP with its substrates in liquid nuclear bodies and effects of SPOP mutations on assembly are poorly understood. Here, we show that substrates trigger phase separation of SPOP in vitro and co-localization in membraneless organelles in cells. Enzymatic activity correlates with cellular co-localization and in vitro mesoscale assembly formation. Disease-associated SPOP mutations that lead to the accumulation of proto-oncogenic proteins interfere with phase separation and co-localization in membraneless organelles, suggesting that substrate-directed phase separation of this E3 ligase underlies the regulation of ubiquitin-dependent proteostasis.
MeSH term(s)	Cell Compartmentation/genetics ; Cell Line, Tumor ; Humans ; Mutation ; Neoplasms/genetics ; Neoplasms/pathology ; Nuclear Proteins/genetics ; Proteostasis/genetics ; Repressor Proteins/genetics ; Ubiquitin/genetics ; Ubiquitin-Protein Ligases/genetics ; Ubiquitination/genetics
Chemical Substances	Nuclear Proteins ; Repressor Proteins ; SPOP protein, human ; Ubiquitin ; CULL-RING ligase, human (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27)
Language	English
Publishing date	2018-09-20
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ZDB-ID	1415236-8
ISSN	1097-4164 ; 1097-2765
ISSN (online)	1097-4164
ISSN	1097-2765
DOI	10.1016/j.molcel.2018.08.027
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Article: Interaction networks and the use of floral resources by male orchid bees (Hymenoptera: Apidae: Euglossini) in a primary rain forests of the Chocó Region (Colombia).

Ospina-Torres, Rodulfo / Montoya-Pfeiffer, Paula María / Parra-H, Alejandro / Solarte, Victor / Tupac Otero, Joel

Revista de biologia tropical

2015 Volume 63, Issue 3, Page(s) 647–658

Abstract: Orchid bees are important keystone pollinators from the Neotropics. With the aim to study the relationships between orchid bees and their nectar and aromatic host species, we made systematic samplings of males across two conservation areas in the ... ...

Abstract	Orchid bees are important keystone pollinators from the Neotropics. With the aim to study the relationships between orchid bees and their nectar and aromatic host species, we made systematic samplings of males across two conservation areas in the biogeographic Choc6 Region of Colombia. We used chemical baits to collect 352 male bees during five months. The pollen attached to their bodies was extracted for palynological identification and to estimate interaction networks. The euglossine community consisted of at least 22 species including Eg. maculilabris, Eg. orellana, Eg. championi and Eg. ignita. The male bees were associated with 84 plants but depended on a small group of them (Peperomia spp. and Anthurium spp, as well as species of Solanaceae, Ericaceae and Malpighiaceae) which were widely distributed across the altitudinal gradient, and were available through the year. The resulting interaction networks revealed a typical nested pattern usually found in plant-pollinator interactions, with several rare bee and plant species interaction with a small group of generalist bees and plant species. Albeit, we found variation within networks related to species composition. Such variation may be a consequence of specific differences in plant flowering phenology.
MeSH term(s)	Animals ; Bees/classification ; Bees/physiology ; Colombia ; Ecosystem ; Male ; Orchidaceae/classification ; Pollination ; Population Density ; Rainforest
Language	English
Publishing date	2015-09
Publishing country	Costa Rica
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2020929-0
ISSN	2215-2075 ; 0034-7744
ISSN (online)	2215-2075
ISSN	0034-7744
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Article ; Online: Int6 and Moe1 interact with Cdc48 to regulate ERAD and proper chromosome segregation.

Otero, Joel H / Suo, Jinfeng / Gordon, Colin / Chang, Eric C

Cell cycle (Georgetown, Tex.)

2010 Volume 9, Issue 1, Page(s) 147–161

Abstract: Int6/eIF3e is implicated in tumorigenesis, but its molecular functions remain unclear. We have studied its fission yeast homolog Yin6, reporting that it regulates proteolysis by controlling the assembly/localization of proteasomes, and binds directly to ... ...

Abstract	Int6/eIF3e is implicated in tumorigenesis, but its molecular functions remain unclear. We have studied its fission yeast homolog Yin6, reporting that it regulates proteolysis by controlling the assembly/localization of proteasomes, and binds directly to another conserved protein, Moe1. In the present study, we isolated Cdc48 as a Moe1-binding protein from a yeast two-hybrid screen, and confirmed biochemically that they form a stable complex in fission yeast. Overexpressing Moe1 or Yin6 partially rescued phenotypes of cdc48 mutants; conversely, overexpressing Cdc48 partially rescued phenotypes of moe1 or yin6 mutants. Mutants defective in both Cdc48 and the Yin6-Moe1 complex showed growth defects that were far more severe than either alone. These double mutants were severely deficient in endoplasmic reticulum associated degradation (ERAD), as they were hypersensitive to accumulation of misfolded proteins. In addition, their chromosomes showed frequent defects in spindle attachment and segregation--these mitotic defects correlated with Ase1 and Bir1/survivin mislocalization. These results suggest that Cdc48, Yin6 and Moe1 act in the same protein complex to concertedly control ERAD and chromosome segregation. Many of these properties are evolutionarily conserved in humans, since human Cdc48 rescued the lethality of the yeast cdc48Delta mutant, and Int6 and Moe1/eIF3d bind Cdc48 in human cells.
MeSH term(s)	Adenosine Triphosphatases/genetics ; Adenosine Triphosphatases/metabolism ; Blotting, Far-Western ; Carrier Proteins/genetics ; Carrier Proteins/metabolism ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; Chromosome Segregation/genetics ; Chromosome Segregation/physiology ; Eukaryotic Initiation Factors/genetics ; Eukaryotic Initiation Factors/metabolism ; Humans ; Immunoprecipitation ; Protein Binding/physiology ; Schizosaccharomyces pombe Proteins/genetics ; Schizosaccharomyces pombe Proteins/metabolism ; Two-Hybrid System Techniques ; Valosin Containing Protein
Chemical Substances	Carrier Proteins ; Cell Cycle Proteins ; Eukaryotic Initiation Factors ; Moe1 protein, S pombe ; Schizosaccharomyces pombe Proteins ; int6 protein, S pombe ; Adenosine Triphosphatases (EC 3.6.1.-) ; Valosin Containing Protein (EC 3.6.4.6)
Language	English
Publishing date	2010-01-09
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ZDB-ID	2146183-1
ISSN	1551-4005 ; 1538-4101 ; 1554-8627
ISSN (online)	1551-4005
ISSN	1538-4101 ; 1554-8627
DOI	10.4161/cc.9.1.10312
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Article ; Online: Interaction networks and the use of floral resources by male orchid bees (Hymenoptera

Rodulfo Ospina-Torres / Paula María Montoya-Pfeiffer / Alejandro Parra-H. / Víctor Solarte / Joel Tupac Otero

Revista de Biología Tropical, Vol 63, Iss 3, Pp 647-

Apidae: Euglossini) in a primary rain forests of the Chocó Region (Colombia)

2015 Volume 658

Abstract	Orchid bees are important keystone pollinators from the Neotropics. With the aim to study the relationships between orchid bees and their nectar and aromatic host species, we made systematic samplings of males across two conservation areas in the biogeographic Chocó Region of Colombia. We used chemical baits to collect 352 male bees during five months. The pollen attached to their bodies was extracted for palynological identification and to estimate interaction networks. The euglossine community consisted of at least 22 species including Eg. maculilabris, Eg. orellana, Eg. championiand Eg. ignita.The male bees were associated with 84 plants but depended on a small group of them (Peperomiaspp. and Anthuriumspp, as well as species of Solanaceae, Ericaceae and Malpighiaceae) which were widely distributed across the altitudinal gradient, and were available through the year. The resulting interaction networks revealed a typical nested pattern usually found in plant-pollinator interactions, with several rare bee and plant species interaction with a small group of generalist bees and plant species. Albeit, we found variation within networks related to species composition. Such variation may be a consequence of specific differences in plant flowering phenology.
Keywords	polinizadores ; redes de interacciones ; relación planta-insecto ; Reserva Natural del Río Ñambí ; Biology (General) ; QH301-705.5
Subject code	590 ; 580
Language	English
Publishing date	2015-09-01T00:00:00Z
Publisher	Vicerractoría Investigación
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Cancer Mutations of the Tumor Suppressor SPOP Disrupt the Formation of Active, Phase-Separated Compartments

Molecular cell. 2018 Oct. 04, v. 72, no. 1

2018

Abstract	Mutations in the tumor suppressor SPOP (speckle-type POZ protein) cause prostate, breast, and other solid tumors. SPOP is a substrate adaptor of the cullin3-RING ubiquitin ligase and localizes to nuclear speckles. Although cancer-associated mutations in SPOP interfere with substrate recruitment to the ligase, mechanisms underlying assembly of SPOP with its substrates in liquid nuclear bodies and effects of SPOP mutations on assembly are poorly understood. Here, we show that substrates trigger phase separation of SPOP in vitro and co-localization in membraneless organelles in cells. Enzymatic activity correlates with cellular co-localization and in vitro mesoscale assembly formation. Disease-associated SPOP mutations that lead to the accumulation of proto-oncogenic proteins interfere with phase separation and co-localization in membraneless organelles, suggesting that substrate-directed phase separation of this E3 ligase underlies the regulation of ubiquitin-dependent proteostasis.
Keywords	breasts ; enzyme activity ; liquids ; mutation ; neoplasms ; organelles ; proteins ; separation ; ubiquitin-protein ligase
Language	English
Dates of publication	2018-1004
Size	p. 19-36.e8.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	1415236-8
ISSN	1097-4164 ; 1097-2765
ISSN (online)	1097-4164
ISSN	1097-2765
DOI	10.1016/j.molcel.2018.08.027
Database	NAL-Catalogue (AGRICOLA)

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Article: A tropical epiphytic orchid uses a lowâlight interception strategy in a spatially heterogeneous light environment

VentreâLespiaucq, Agustina B / AdriÃ¡n Escudero / Joel T. Otero / Juan A. Delgado / Luis Balaguer / MarÃa A. SÃ¡nchez / Nhora H. OspinaâCalderÃ³n / Nicola S. Flanagan

Biotropica. 2017 May, v. 49, no. 3

2017

Abstract: Light is considered a nonâlimiting factor for vascular epiphytes. Nevertheless, an epiphyte's access to light may be limited by phorophyte shading and the spatioâtemporal environmental patchiness characteristic of epiphytic habitats. We assessed the ... ...

Abstract	Light is considered a nonâlimiting factor for vascular epiphytes. Nevertheless, an epiphyte's access to light may be limited by phorophyte shading and the spatioâtemporal environmental patchiness characteristic of epiphytic habitats. We assessed the extent to which potential light interception in Rodriguezia granadensis, an epiphytic orchid, is determined by individual factors (plant size traits and leaf traits), or environmental heterogeneity (light patchiness) within the crown of the phorophyte, or both. We studied 104 adult plants growing on Psidium guajava trees in two habitats with contrasting canopy cover: a dry tropical forest edge, and isolated trees in a pasture. We recorded the number of leaves and the leaf area, the leaf position angles, and the potential exposure of the leaf surface to direct irradiance (silhouette area of the leaf blade), and the potential irradiance incident on each plant. We found the epiphytes experience a highly heterogeneous light environment in the crowns of P.Â guajava. Nonetheless, R.Â granadensis plants displayed a common light interception strategy typical of lowâlight environments, resembling terrestrial, forest understory plants. Potential exposure of the total leaf surface to direct irradiance correlated positively with plant size and withinâplant variation in leaf orientation. In manyâleaved individuals, withinâplant variation in leaf angles produced complementary leaf positions that enhanced potential light interception. This light interception strategy suggests that, in contrast to current wisdom, enhancing light capture is important for vascular epiphytes in canopies with high spatioâtemporal heterogeneity in light environments.
Keywords	canopy ; edge effects ; epiphytes ; habitats ; leaf angle ; leaf area ; leaf blade ; light intensity ; mature plants ; Orchidaceae ; pastures ; Psidium guajava ; shade ; trees ; tropical forests ; understory
Language	English
Dates of publication	2017-05
Size	p. 318-327.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	2052061-X
ISSN	1744-7429 ; 0006-3606
ISSN (online)	1744-7429
ISSN	0006-3606
DOI	10.1111/btp.12425
Database	NAL-Catalogue (AGRICOLA)

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