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GIGANTEA influences leaf senescence in trees in two different ways

Fataftah, Nazeer and Bag, Pushan and André, Domenique and Lihavainen, Jenna and Zhang, Bo and Ingvarsson, Pär and Nilsson, Ove and Jansson, Stefan (2021). GIGANTEA influences leaf senescence in trees in two different ways. Plant Physiology. 187 , 2435-2450
[Research article]

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Abstract

GIGANTEA (GI) genes have a central role in plant development and influence several processes. Hybrid aspen T89 (Populus tremula x tremuloides) trees with low GI expression engineered through RNAi show severely compromised growth. To study the effect of reduced GI expression on leaf traits with special emphasis on leaf senescence, we grafted GI-RNAi scions onto wild-type rootstocks and successfully restored growth of the scions. The RNAi line had a distorted leaf shape and reduced photosynthesis, probably caused by modulation of phloem or stomatal function, increased starch accumulation, a higher carbon-to-nitrogen ratio, and reduced capacity to withstand moderate light stress. GI-RNAi also induced senescence under long day (LD) and moderate light conditions. Furthermore, the GI-RNAi lines were affected in their capacity to respond to "autumn environmental cues" inducing senescence, a type of leaf senescence that has physiological and biochemical characteristics that differ from those of senescence induced directly by stress under LD conditions. Overexpression of GI delayed senescence under simulated autumn conditions. The two different effects on leaf senescence under LD or simulated autumn conditions were not affected by the expression of FLOWERING LOCUS T. GI expression regulated leaf senescence locally-the phenotype followed the genotype of the branch, independent of its position on the tree-and trees with modified gene expression were affected in a similar way when grown in the field as under controlled conditions. Taken together, GI plays a central role in sensing environmental changes during autumn and determining the appropriate timing for leaf senescence in Populus.

Authors/Creators:Fataftah, Nazeer and Bag, Pushan and André, Domenique and Lihavainen, Jenna and Zhang, Bo and Ingvarsson, Pär and Nilsson, Ove and Jansson, Stefan
Title:GIGANTEA influences leaf senescence in trees in two different ways
Series Name/Journal:Plant Physiology
Year of publishing :2021
Volume:187
Page range:2435-2450
Number of Pages:16
Publisher:OXFORD UNIV PRESS INC
ISSN:0032-0889
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Genetics (medical genetics to be 30107 and agricultural genetics to be 40402)
URN:NBN:urn:nbn:se:slu:epsilon-p-115190
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-115190
Additional ID:
Type of IDID
DOI10.1093/plphys/kiab439
Web of Science (WoS)000733403700044
ID Code:26667
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Dept. of Forest Genetics and Plant Physiology
(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: SLUpub Connector
Deposited On:10 Jan 2022 07:25
Metadata Last Modified:10 Jan 2022 07:31

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