Home > I International Apple Symposium > Mitochondrial alternative oxidase pathway protects photosynthetic apparatus against photodamage by alleviating photoinhibition in Malus hupehensis leaves under drought stress

Articles

Mitochondrial alternative oxidase pathway protects photosynthetic apparatus against photodamage by alleviating photoinhibition in Malus hupehensis leaves under drought stress

Article number

1261_19

Pages

115 – 122

Language

English

Abstract

The role of the mitochondrial alternative oxidase (AOX) pathway in photoprotection in Malus hupehensis (Pamp.) Rehd. leaves under drought stress was studied.
The results indicated that drought increased the amount of leaf AOX protein and enhanced the activity of the AOX pathway.
Under high light intensity and after treatment with salicylhydroxamic acid (SHAM) in order to inhibit the AOX pathway the maximal photochemical efficiency of photosystem II (PSII) (F_v/F_m), the PSII excitation pressure (1-q_P), and the electron transport rate (ETR) were not affected in water-replete plants.
The ETR and F_v/F_m significantly decreased, while the 1-q_P significantly increased in drought-stressed plants, indicating that under drought-stress conditions, the inhibition of the AOX pathway caused more severe photoinhibition.
The results demonstrated that the AOX pathway played an important role in photoprotection in M. hupehensis leaves under drought stress.

Publication

I International Apple Symposium

Authors

Shan Sun, Xiu-Yu Xu, Qing-Zhong Liu, Hui-Yuan Gao

Keywords

Malus hupehensis (Pamp.) Rehd., mitochondrial alternative oxidase pathway, drought stress, photoprotection, salicylhydroxamic acid

Full text

https://doi.org/10.17660/ActaHortic.2019.1261.19

Groups involved

Division Temperate Tree Fruits

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