Abscisic acid accumulation modulates auxin transport in the root tip to enhance proton secretion for maintaining root growth under moderate water stress
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摘要Maintenance of root growth is essential for plant adaptation to soil drying. Here, we tested the hypothesis that auxin transport is involved in mediating ABA's modulation by activating proton secretion in the root tip to maintain root growth under moderate water stress. Rice and Arabidopsis plants were raised under a hydroponic system and subjected to moderate water stress (-0.47 MPa) with polyethylene glycol (PEG). ABA accumulation, auxin transport and plasma membrane H+-ATPase activity at the root tip were monitored in addition to the primary root elongation and root hair density. We found that moderate water stress increases ABA accumulation and auxin transport in the root apex. Additionally, ABA modulation is involved in the regulation of auxin transport in the root tip. The transported auxin activates the plasma membrane H+-ATPase to release more protons along the root tip in its adaption to moderate water stress. The proton secretion in the root tip is essential in maintaining or promoting primary root elongation and root hair development under moderate water stress. These results suggest that ABA accumulation modulates auxin transport in the root tip, which enhances proton secretion for maintaining root growth under moderate water stress.
著者Xu WF, Jia LG, Shi WM, Liang JS, Zhou F, Li QF, Zhang JH
期刊名稱New Phytologist
出版年份2013
月份1
日期1
卷號197
期次1
出版社WILEY-BLACKWELL
頁次139 - 150
國際標準期刊號0028-646X
電子國際標準期刊號1469-8137
語言英式英語
關鍵詞ABA; auxin transport; plasma membrane H plus -ATPase; primary root growth; proton secretion; root hair development; root tip; water stress
Web of Science 學科類別Plant Sciences; PLANT SCIENCES

上次更新時間 2020-17-11 於 01:19