Photosynthetica, 2017 (vol. 55), issue 4

Photosynthetica 2017, 55(4):588-602 | DOI: 10.1007/s11099-016-0674-z

Inhibition of root respiration induces leaf senescence in Alhagi sparsifolia

G. L. Tang1,2, X. Y. Li1,2,*, L. S. Lin1,2, Y. Hu3, F. J. Zeng1,2
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
2 Cele National Station of Observation and Research for Desert-Grassland Ecosystem in Xinjiang, Cele, Xinjiang, China
3 College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, China

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.

Keywords: carbohydrate; chlorophyll; girdling; phloem transport; photosynthetic pigment

Received: June 3, 2016; Accepted: September 7, 2016; Published: December 1, 2017Show citation

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Tang, G.L., Li, X.Y., Lin, L.S., Hu, Y., & Zeng, F.J. (2017). Inhibition of root respiration induces leaf senescence in Alhagi sparsifolia. Photosynthetica, 55(4), 588-602. doi: 10.1007/s11099-016-0674-z.
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