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

被引:66
作者
Roberts, SK [1 ]
机构
[1] Univ Cambridge, Dept Plant Sci, Cambridge CB2 3EA, England
关键词
D O I
10.1104/pp.116.1.145
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
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收藏
页码:145 / 153
页数:9
相关论文
共 40 条
[11]   INWARD-RECTIFYING K+ CHANNELS IN ROOT HAIRS OF WHEAT - A MECHANISM FOR ALUMINUM-SENSITIVE LOW-AFFINITY K+ UPTAKE AND MEMBRANE-POTENTIAL CONTROL [J].
GASSMANN, W ;
SCHROEDER, JI .
PLANT PHYSIOLOGY, 1994, 105 (04) :1399-1408
[12]   IMPROVED PATCH-CLAMP TECHNIQUES FOR HIGH-RESOLUTION CURRENT RECORDING FROM CELLS AND CELL-FREE MEMBRANE PATCHES [J].
HAMILL, OP ;
MARTY, A ;
NEHER, E ;
SAKMANN, B ;
SIGWORTH, FJ .
PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY, 1981, 391 (02) :85-100
[13]   SOLUTE ACCUMULATION AND GROWTH IN PLANTS OF PEARL-MILLET (PENNISETUM-AMERICANUM [L] LEEKE) EXPOSED TO ABSCISIC-ACID OR WATER-STRESS [J].
HENSON, IE .
JOURNAL OF EXPERIMENTAL BOTANY, 1985, 36 (173) :1889-1899
[14]  
HODGKIN AL, 1952, J PHYSL, V144, P505
[15]   POTASSIUM-TRANSPORT IN CORN ROOTS .4. CHARACTERIZATION OF THE LINEAR COMPONENT [J].
KOCHIAN, LV ;
JIAO, XZ ;
LUCAS, WJ .
PLANT PHYSIOLOGY, 1985, 79 (03) :771-776
[16]   Tissue-specific expression of arabidopsis AKT1 gene is consistent with a role in K+ nutrition [J].
Lagarde, D ;
Basset, M ;
Lepetit, M ;
Conejero, G ;
Gaymard, F ;
Astruc, S ;
Grignon, C .
PLANT JOURNAL, 1996, 9 (02) :195-203
[17]  
LEMTIRICHLIEH F, 1994, J MEMBRANE BIOL, V137, P99
[18]   EVIDENCE FOR PROTEIN PHOSPHATASE-1 AND PHOSPHATASE-2A REGULATION OF K+ CHANNELS IN 2 TYPES OF LEAF-CELLS [J].
LI, WW ;
LUAN, S ;
SCHREIBER, SL ;
ASSMANN, SM .
PLANT PHYSIOLOGY, 1994, 106 (03) :963-970
[19]  
MAATHUIS FJM, 1995, PLANTA, V197, P456, DOI 10.1007/BF00196667
[20]   CALCIUM AND ABA-INDUCED STOMATAL CLOSURE [J].
MACROBBIE, EAC .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 1992, 338 (1283) :5-18