水稻对氮磷钾的积累和一些光合特性的研究 Ⅱ.水稻的一些光合特性

<正> 引言对于水稻的光合作用与干物质生产,国内外研究颇多,其中以户苅和武田等的论述较为系统、完整。本文以我国常规稻和杂交稻的推广品种为材料,探讨了水稻生育期中光合速率变化的规律和不同品种光合产物的生产和分配的特点。

STUDIES ON THE ACCUMULATION OF NPK AND SOME PHOTOSYNTHETIC CHARACTERS OF RICE Ⅱ.SOME PHOTOSYNTHETIC CHARACTERS OF RICE

Three sien type rice varieties, Lu Nan Zao No, 1 ,Gui Chao No. 2 and Shan You No. 2 (hybrid rice) were used to investigate the photosynthesis activity of leeaves and dry matter productiou of rice. The results obtained were summarized as follows. (1) The rate of photosynthcsis per unit leaf area of the fully Expandved top leaves on the main stems were measured under optimum light and temperature conditions with an infrared gas analyzer, The changes in the photosynthetic rate at the growth stages showed a curve with two clear peaks. The first one at actiue-tillering stage (in the medium-maturing varieties Gui Chao No. 2 and shun You No. 2) or at the formation stage of pistiL and stamen (in the early variety Lu Nan Zao No. 1) was higher than the second one at heading time. (2) The curve of photosynthetic rate during the life duration was approximateLy paraLLeL to that of nitrogen content per unit leaf area. This result indicated that the photosynthesis activity varied with the nitrogen content in the leaves. (3) Isotope tracer research showed that the percentages of ~(14)C absorbed by the Leaves before heading transferring into the ripening panicles were 55.2%, 28.0% and 17.7% in Shan You No. 2, Lu Nan Zao No. 1 and Gui Chao No.2, respectively. And there was signifieant difference between Shun You No. 2 and the other two varieties. (4) The leaf area per plant and NAR after heading were obviousLy higher in Shan You No. 2 than in Gui Chao No.2. As a result Gui Chao No. 2 had less dry matter product than Shan You No.2 at the ripening stage.