关键词: 小麦, 小麦

Abstract: To confirm the diversity in source-sink characteristics of hybrid rice maintain lines under different nitrogen applied levels, with two hybrid parent rice varieties, Zhong9B and You1B as experiment materials, the effect of different nitrogen applied levels on source-sink characteristics of hybrid rice maintain lines was researched. The results showed that, leaves source increased with nitrogen applied levels increasing. However, applying nitrogen too much wasn’t benefit for maintaining more photosynthetic green leaf areas during grains filling. The resistance to nitrogen of Zhong9B was better than that of You1B, the total and filled grains of Zhong9B under high nitrogen levels increased, but those of You1B under the condition of high nitrogen levels showed a decreasing trend. Under different nitrogen levels, the relationship source-sink of different rice varieties changed with the grains filling process, the ratio of grain numbers to leaf areas depended on total and filled amounts of grain to unit leaf areas during different grain filling stage.