NITRATE ACCUMULATION BY WHEAT (TRITICUM-AESTIVUM) IN RELATION TO GROWTH AND TISSUE-N CONCENTRATIONS

被引：32
|
作者：
ZHEN, RG
LEIGH, RA
机构：
[1] Rothamsted Experimental Station, AFRC Institute of Arable Crops Research, Harpenden, AL5 2JQ, Herts
来源：
PLANT AND SOIL | 1990年 / 124卷 / 02期
关键词：
nitrate accumulation; nitrate mobilisation; plant growth; solution culture; Triticum aestivum L; wheat;
D O I：
10.1007/BF00009253
中图分类号：
S3 [农学（农艺学）];
学科分类号：
0901 ;
摘要：
The accumulation of nitrate in relation to total N concentrations ([N]i) in tissues of wheat (Triticum aestivum L., cv Sicco) grown in solution culture was investigated. Root, shoot and leaf tissues showed qualitatively similar relationships between internal nitrate concentrations and [N]i, both expressed on a tissue water basis. At low [N]i, no nitrate was detectable but once a particular [N]i was exceeded, nitrate accumulated as a linear function of [N]i. The threshold [N]i values for nitrate accumulation were 110, 450, and 550 m M for roots, total shoot and leaf 4, respectively. The slope of the relationship between nitrate and [N]i indicated that in all tissues nitrate accounted for 50-55% of the extra N accumulated above the threshold [N]i. All growth requirements for N were satisfied before nitrate accumulated. © 1990 Kluwer Academic Publishers.
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页码：157 / 160
页数：4
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