【摘 要】
：
By removing panicles and spikelets, the effects of nitrogen supply-demand balance (NSDB) onnitrogen transiocation and senescence of leaves at different position
【机 构】
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Key Laboratory of Crop Growth Regulation
论文部分内容阅读
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.
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