Inhibition of root respiration induces leaf senescence in Alhagi sparsifolia

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 gir...

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Bibliographic Details
Published in:Photosynthetica 2017-12, Vol.55 (4), p.588-602
Main Authors: Tang, G.-L., Li, X.-Y., Lin, L.-S., Hu, Y., Zeng, F.-J.
Format: Article
Language:English
Subjects:
Abscisic acid
Biomedical and Life Sciences
Carbohydrates
Chlorophyll
Conductance
Fluorescence
Gene expression
Girdling
Inhibition
Leaves
Life Sciences
Malondialdehyde
Original Papers
Phloem
Photosynthesis
Plant Physiology
Proline
Resistance
Respiration
Senescence
Stomata
Stomatal conductance
Transpiration
Water absorption
Water potential
Water stress
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Summary: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.
ISSN:0300-3604
1573-9058
DOI:10.1007/s11099-016-0674-z