Alleviation of photoinhibition in drought-stressed wheat (Triticum aestivum) by foliar-applied glycinebetaine

作者：Ma QQ; Wang W^*; Li YH; Li DQ; Zou Q

来源：Journal of Plant Physiology, 2006, 163(2): 165-175.

DOI：10.1016/j.jplph.2005.04.023

• D1 protein turnover
• drought stress
• glycinebetaine
• photoinhibition
• photosynthesis
• wheat (Triticum aestivum)

Effects of foliar application of 100 mmol/L glycinebetaine (GB) on PS II photochemistry in wheat (Triticum aestivum) flag leaves under drought stress combined with high irradiance were investigated. The results show that GB-treated plants maintained a higher net photosynthetic rate during drought stress than non-GB treated plants. Exogenous GB can preserve the photochemical activity of PSII, for GB-treated plants maintain higher maximal photochemistry efficiency of PSII (F-v/F-m) and recover more rapidly from photoinhibition. In addition, GB-treated plants can maintain higher antioxidative enzyme activities and suffer less oxidative stress. Our data suggest that GB may protect the PSII complex from damage through accelerating D1 protein turnover and maintaining anti-oxidative enzyme activities at higher level to alleviate photodamage. Diethytdithiocarbamate as well as streptomycin treatment can impair the protective effect of GB on PSII. In summary, GB can enhance the photoinhibition tolerance of PSII.

• 出版日期2006-2
• 单位山东农业大学; 中国热带农业科学院