Regulation of K+ channels in maize roots by water stress and abscisic acid

Roberts, Stephen K. (1998) Regulation of K+ channels in maize roots by water stress and abscisic acid. Plant Physiology, 116 (1). pp. 145-153. ISSN 0032-0889

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Abstract

Root cortical and stelar protoplasts were isolated from maize (Zea mays L.) plants that were either well watered or water stressed, and the patch-clamp technique was used to investigate their plasma membrane K+ channel activity. In the root cortex water stress did not significantly affect inward-or outward-rectifying K+ conductances relative to those observed in well-watered plants. In contrast, water stress significantly reduced the magnitude of the outward-rectifying K+ current in the root stele but had little effect on the inward-rectifying K+ current. Pretreating well-watered plants with abscisic acid also significantly affected K+ currents in a way that was consistent with abscisic acid mediating, at least in part, the response of roots to water stress. It is proposed that the K+ channels underlying the K+ currents in the root stelar cells represent pathways that allow K+ exchange between the root symplasm and xylem apoplast. It is suggested that the regulation of K+ channel activity in the root in response to water stress could be part of an important adaptation of the plant to survive drying soils.

Item Type:
Journal Article
Journal or Publication Title:
Plant Physiology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1314
Subjects:
ID Code:
72401
Deposited By:
Deposited On:
22 Jan 2015 10:13
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Mar 2020 04:06