Dual functions of phospholipase D alpha 1 in plant response to drought

作者：Hong Yueyun; Zheng Suqin; Wang Xuemin^*

来源：Molecular Plant, 2008, 1(2): 262-269.

DOI：10.1093/mp/ssm025

• drought
• phospholipase
• phosphatidic acid
• lipid oxidation
• lipid signaling

Phospholipase D alpha 1 (PLD alpha 1) has been shown to mediate the abscisic acid regulation of stomatal movements. Arabidopsis plants deficient in PLD alpha 1 increased, whereas PLD alpha 1-overexpressing tobacco decreased, transpirational water loss. In the early stage of drought, the decrease in water loss was associated with a rapid stomatal closure caused by a high level of PLD in PLD alpha 1-overexpressing plants. However, in the late stage of drought, the overexpressing plants displayed more susceptibility to drought than control plants. PLD alpha 1 activity in the overexpressing plants was much higher than that of control plants in which drought also induced an increase in PLD alpha 1 activity. The high level of PLD alpha 1 activity was correlated to membrane degradation in late stages of drought, as demonstrated by ionic leakage and lipid peroxidation. These findings indicate that a high level of PLD alpha 1 expression has different effects on plant response to water deficits. It promotes stomatal closure at earlier stages, but disrupts membranes in prolonged drought stress. These findings are discussed in relation to the understanding of PLD functions and potential applications.

• 出版日期2008-3