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The effect of
ultraviolet radiation on water-logging resistance in Tibetan
peach
Tao Bai, Yi
Wang, Xinzhong Zhang, Xuefeng Xu and Zhen Hai Han*
Institute for Horticultural Plants, China Agricultural
University / a Key Laboratory of Beijing Municipality of
Stress Physiology and Molecular Biology for Fruit Tree,
Beijing 100193, China.
*Corresponding author. E-mail:
rschan@cau.edu.cn.
Tel:
86-10-62731118
Abbreviations: ABA;
abscisic acid, GA; gibberellic acid, IAA;
indole-3-acetic acid, ZR; zeatin riboside, SOD;
superoxide dismutase, POD; peroxidase.
Accepted 15 September, 2009 |
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The effect of ultraviolet (UV) radiation on the
water-logging resistance of Tibetan peach (Amygdalus mira
Koehne) remains unclear. In this study, Tibetan peach
seedlings were subjected to 9-days of UV-B (280 - 320 nm)
supplementation, water-logging or the combination of both,
and the growth indicated by leaf number, net photosynthetic
rate and stomatal conductance were monitored. In addition,
the activities of protection enzymes SOD and POD, as well as
the concentrations of hormones ABA, ZR, GAs and ZR in leaves
were examined. The results show that UV-B or water-logging
or the combination of both factors restrained the growth
trend, net photosynthetic rate and stomatal conductance.
Both UV-B and water-logging increased SOD activity, and
synergistically led to a drastic increase in POD activity.
Furthermore, UV-B and water-logging condition increased the
concentrations of ABA, ZR and GAs, while it decreased ZR.
The results suggest that the changes of hormone
concentrations in Tibetan peach leaves may explain the
increased activities of protection enzymes and decreased
photosynthesis under water-logging condition.
Key words:
Tibetan peach, water-logging, UV-B, photosynthesis,
protection enzymes, hormones. |
