Interaction of zinc and IAA alleviate aluminum-induced damage on photosystems via promoting proton motive force and reducing proton gradient in alfalfa.

ABSTRACT:

Background

In acidic soils, aluminum (Al) competing with Zn results in Zn deficiency in plants. Zn is essential for auxin biosynthesis. Zn-mediated alleviation of Al toxicity has been rarely studied, the mechanism of Zn alleviation on Al-induced photoinhibition in photosystems remains unclear. The objective of this study was to investigate the effects of Zn and IAA on photosystems of Al-stressed alfalfa. Alfalfa seedlings with or without apical buds were exposed to 0 or100 μM AlCl₃ combined with 0 or 50 μM ZnCl₂, and then foliar spray with water or 6 mg L^- 1 IAA.

Results

Our results showed that Al stress significantly decreased plant growth rate, net photosynthetic rate (Pn), quantum yields and electron transfer rates of PSI and PSII. Exogeno

SUBMITTER: Su L 

PROVIDER: S-EPMC7501636 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature