Ammonium decreases muskmelon root system hydraulic conductivity

被引:28
作者
Adler, PR
Wilcox, GE
Markhart, AH
机构
[1] PURDUE UNIV,DEPT HORT,W LAFAYETTE,IN 47907
[2] UNIV MINNESOTA,DEPT MICROBIOL,ST PAUL,MN 55108
关键词
D O I
10.1080/01904169609365207
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The flow of water through plant roots is controlled by two driving forces, the transpiration rate (Delta P) and osmotic potential difference between the soil solution and inside the root (Delta pi), and the root system hydraulic conductivity [L(root), (L . m(-2))]. Plant water status is affected by the source of nitrogen (N) supplied to the plant. This study was undertaken to isolate the effect of ammonium (NH4)-N on L(root), from other factors affecting water transport through plants. The effect of NH4-N on muskmelon (Cucumis melo L.) L(root) was determined by estimating conductance at high water flux rates where osmotic effects are negligible. Ammonium decreased L(root) by about 50%. At a given transpiration rate, the NH4-N-induced decrease in L(root) decreased leaf water potential [psi(leaf) (MPa)] which, in turn, may alter the behavior of the leaves as observed in other studies.
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页码:1395 / 1403
页数:9
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