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Nitrate fertilization may delay autumn leaf senescence, while amino acid treatments do not

Fataftah, Nazeer and Edlund, Erik and Lihavainen, Jenna and Bag, Pushan and Bjorken, Lars and Näsholm, Torgny and Jansson, Stefan (2022). Nitrate fertilization may delay autumn leaf senescence, while amino acid treatments do not. Physiologia Plantarum. 174 :3 , e13690
[Research article]

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Abstract

Fertilization with nitrogen (N)-rich compounds leads to increased growth but may compromise phenology and winter survival of trees in boreal regions. During autumn, N is remobilized from senescing leaves and stored in other parts of the tree to be used in the next growing season. However, the mechanism behind the N fertilization effect on winter survival is not well understood, and it is unclear how N levels or forms modulate autumn senescence. We performed fertilization experiments and showed that treating Populus saplings with inorganic nitrogen resulted in a delay in senescence. In addition, by using precise delivery of solutes into the xylem stream of Populus trees in their natural environment, we found that delay of autumn senescence was dependent on the form of N administered: inorganic N (NO3-) delayed senescence, but amino acids (Arg, Glu, Gln, and Leu) did not. Metabolite profiling of leaves showed that the levels of tricarboxylic acids, arginine catabolites (ammonium, ornithine), glycine, glycine-serine ratio and overall carbon-to-nitrogen (C/N) ratio were affected differently by the way of applying NO3- and Arg treatments. In addition, the onset of senescence did not coincide with soluble sugar accumulation in control trees or in any of the treatments. We propose that different regulation of C and N status through direct molecular signaling of NO3- and/or different allocation of N between tree parts depending on N forms could account for the contrasting effects of NO3- and tested here amino acids (Arg, Glu, Gln, and Leu) on autumn senescence.

Authors/Creators:Fataftah, Nazeer and Edlund, Erik and Lihavainen, Jenna and Bag, Pushan and Bjorken, Lars and Näsholm, Torgny and Jansson, Stefan
Title:Nitrate fertilization may delay autumn leaf senescence, while amino acid treatments do not
Series Name/Journal:Physiologia Plantarum
Year of publishing :2022
Volume:174
Number:3
Article number:e13690
Number of Pages:14
Publisher:WILEY
ISSN:0031-9317
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 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) > Botany
URN:NBN:urn:nbn:se:slu:epsilon-p-117347
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117347
Additional ID:
Type of IDID
DOI10.1111/ppl.13690
Web of Science (WoS)000798701400001
ID Code:28252
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:07 Jun 2022 07:34
Metadata Last Modified:07 Jun 2022 07:41

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