期刊
PLANT JOURNAL
卷 75, 期 6, 页码 977-988出版社
WILEY
DOI: 10.1111/tpj.12258
关键词
stomata; guard cells; hexokinase; sucrose; abscisic acid; transpiration
资金
- Israel Ministry of Agriculture, Chief Scientist Research Grants [261-0865, 261-0845]
- BARD, the United States-Israel Binational Agricultural and Development Fund [IS-4541-12]
Stomata, composed of two guard cells, are the gates whose controlled movement allows the plant to balance the demand for CO2 for photosynthesis with the loss of water through transpiration. Increased guard-cell osmolarity leads to the opening of the stomata and decreased osmolarity causes the stomata to close. The role of sugars in the regulation of stomata is not yet clear. In this study, we examined the role of hexokinase (HXK), a sugar-phosphorylating enzyme involved in sugar-sensing, in guard cells and its effect on stomatal aperture. We show here that increased expression of HXK in guard cells accelerates stomatal closure. We further show that this closure is induced by sugar and is mediated by abscisic acid. These findings support the existence of a feedback-inhibition mechanism that is mediated by a product of photosynthesis, namely sucrose. When the rate of sucrose production exceeds the rate at which sucrose is loaded into the phloem, the surplus sucrose is carried toward the stomata by the transpiration stream and stimulates stomatal closure via HXK, thereby preventing the loss of precious water.
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