Relationships Between Balance of Nitrogen Supply-Demand and Nitrogen Translocation and Senescence of Different Position Leaves on Rice
Relationships Between Balance of Nitrogen Supply-Demand and Nitrogen Translocation and Senescence of Different Position Leaves on Rice
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发表时间：
2003
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通讯作者：
WANGShao-hua;JIZhi-jun;LIUSheng-huang;DINGYan-feng;CAOWei-xing
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作者：
WANGShao-hua;JIZhi-jun;LIUSheng-huang;DINGYan-feng;CAOWei-xing
通过去除穗部和小穗部，研究了氮素供需平衡对水稻同一茎不同部位叶片氮素转运和衰老的影响。结果表明，在NSDB<0 （CK）条件下，4叶氮素转运和衰老正常；随着NSDB的增加，顶叶（LFT）尤其是顶4叶的输氮量显著减少，MDA含量和色差（SPAD值）降低，SOD和CAT活性升高。在NSDB>（脱穗）处理下，top4叶片氮素积累量显著增加，叶片衰老进程延缓。结果还表明，第4叶的颜色主要受顶部4叶的NSDB的影响，当氮供应不足时，第4叶的颜色比第3叶浅。
By removing panicles and spikelets, the effects of nitrogen supply-demand balance (NSDB) onnitrogen transiocation and senescence of leaves at different positions of the same stem in rice plant werestudied. The results showed that under NSDB＜0 (CK), nitrogen translocation and senescence of the top 4leaves was normal. Nitrogen exported from the top leaves (LFT) especially the top 4 leaves decreased remar-kably with increase of NSDB, thus, their MDA contents and differences in color (SPAD value) decreased,while the activities of SOD and CAT increased. Under NSDB＞0 (panicle removal), N accumulation of the top4 leaves increased significantly, and the leaf senescence process was delayed. The results also indicated that thecolor of the 4th LFT was mainly affected by NSDB among the top 4 leaves and was lighter than the 3rd LFTwhen nitrogen supply was insufficient for the sink need.