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Inhibition of root respiration induces leaf senescence in Alhagi sparsifolia

  • Original papers
  • Published:
Photosynthetica

Abstract

Leaf senescence can be induced by numerous factors. In order to explore the relationship between root respiration and leaf senescence, we utilized different types of phloem girdling to control the root respiration of Alhagi sparsifolia and its physiological response. Our results showed that both girdling and inhibition of root respiration led to a decline of stomatal conductance, photosynthesis, transpiration rate, chlorophyll (Chl) a, Chl b, carotenoid (Car) content, Chl a/b, Chl/Car, water potential, and Chl a fluorescence, as well as to an increase of abscisic acid (ABA), proline, and malondialdehyde content in leaves and to upregulation of senescence-associated gene expression. Our present work implied that both inhibition of root respiration and girdling can induce leaf senescence. In comparison with phloem girdling, the leaf senescence caused by inhibition of root respiration was less significant. The reason for girdling-induced senescence was ABA and carbohydrate accumulation. Senescence induced by inhibition of root respiration occurred due to leaf water stress resulting from inhibition of water absorption.

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Abbreviations

ABA:

abscisic acid

ABS/RC:

absorption flux (of antenna Chls) per RC (also a measure of PSII apparent antenna size)

Car:

carotenoids

Chl:

chlorophyll

CS:

cross section of the sample

DIo/RC:

dissipation flux per RC

DM:

dry mass

E :

transpiration rate

ETo/RC:

electron transport flux (further than \({Q_{{A^ - }}}\)) per RC

Fv/Fm :

maximum photochemical efficiency of PSII

FM:

fresh mass

G1:

girdling with one branch left

G2:

girdling with two branches left

g s :

stomatal conductance

JA:

jasmonic acid

MDA:

malondialdehyde

Mo :

approximated initial slope of the fluorescence transient

N1:

nongirdling with one branch left

N2:

nongirdling with two branches left

OEC:

oxygen-evolving complex

PIabs :

performance index on absorption basis

P N :

net photosynthetic rate

PQ:

plastoquinone

Pro:

proline

RC:

reaction center

RC/CS:

density of RCs (\({Q_{{A^ - }}}\)reducing PSII reaction centers)

SA:

salicylic acid

SAGs:

senescence-associated genes

Sm :

normalised total complementary area above the OJIP transient (reflecting single-turnover QA reduction events)

TBA:

thiobarbituric acid

TRo/RC:

trapped energy flux (leading to QA reduction) per RC

ψo :

probability that a trapped exciton moves an electron into the electron transport chain beyond \({Q_{{A^ - }}}\) (at t = 0)

φEo :

quantum yield for electron transport (at t = 0)

φPo :

maximum quantum yield for primary photochemistry

Ψleaf :

leaf water potential

ΨM :

midday water potential

ΨP :

predawn water potential

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Authors and Affiliations

  1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China

    G.-L. Tang, X.-Y. Li, L.-S. Lin & F.-J. Zeng

  2. Cele National Station of Observation and Research for Desert-Grassland Ecosystem in Xinjiang, Cele, Xinjiang, 848300, China

    G.-L. Tang, X.-Y. Li, L.-S. Lin & F.-J. Zeng

  3. College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, 830052, China

    Y. Hu

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  1. G.-L. Tang
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Correspondence to X.-Y. Li.

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Acknowledgments: We thank the anonymous reviewers for valuable comments. We also express gratitude to Zhuyu Gu for assistance with experiment, and Jake Carpenter for polishing the English in this manuscript. This research was supported by National Natural Sciences Foundation of China (41571057), Key Program of Joint Funds of the National Natural Sciences Foundation and the Government of Xinjiang Uygur Autonomous Region of China (U1203201), and the National Natural Sciences Foundation of China (41371516).

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Tang, GL., Li, XY., Lin, LS. et al. Inhibition of root respiration induces leaf senescence in Alhagi sparsifolia . Photosynthetica 55, 588–602 (2017). https://doi.org/10.1007/s11099-016-0674-z

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