田间可调式UV-B辐射增强对籼型杂交稻“协优432”生长及产量的影响

在大田栽培条件下，研究了采用可调式UV-B辐射增强自动控制系统对晚稻品种“协优432”生长发育及产量的影响。结果表明，UV-B辐射增强对该水稻品种光合及产量的影响不显著，具体表现在：（1）叶绿素a、叶绿素b在分蘖期分别上升4.60%和8.37%；拔节期叶绿素a下降3.20%，叶绿素b上升0.20%；孕穗期叶绿素a、叶绿素b上升2.57%和1.52%；（2）最大光合速率在拔节期和孕穗期分别上升1.38%和下降1.29%；（3）孕穗期叶绿素荧光参数PSII效率(PhiPS2)、电子传递效率(ETR)和光化学猝灭系数(qP)上升幅度为10.22%、10.22%、10.21%；（4）株高在分蘖期上升0.18%；拔节期上升0.87%；孕穗期上升3.90%；成熟期上升0.14%；（5）水稻成熟后，经UV-B辐射的水稻平均穗长增加了0.16%，每穗穗粒重、每株有效穗数、千粒重分别下降了0.35%、3.02%、1.23%。以上指标和自然日光UV-B辐射组进行方差分析，差异均不显著。

Effects of Modulated Uv-b Supplementation on the Growth and Yield of Rice (Oryza sativa L.) in Fields

We investigated responses of growth and grain yield to increased exposure to UV-B (280-320nm) radiation of rice (Oryza sativa L.) "Xieyou 432" using a modulated UV-B supplementation system under field conditions. Our study showed that enhanced UV-B had little effects on the growth and yield of rice. The results are as follows: (1) Under enhanced UV-B conditions, contents of chlorophyll a, b increased by 4.60% and 8.37% during tillering stage; during jointing stage, chlorophyll a content decreased by 3.20% while chlorophyll b increased by 0.20%; during booting stage, contents of chlorophyll a, b increased by 2.57% and 1.52%; (2) maximum photosynthetic rate increased by 1.38% during jointing stage and decreased by 1.29% during booting stage; (3) kinetics parameters of PSII efficiency (PhiPS2), electron transport rate (ETR) and photochemical quenching (qP) increased by 10.22%, 10.22%, 10.21% during booting stage; (4) rice height increased by 0.18%, 0.87%, 3.90% and 0.14% during tillering stage, jointing stage, booting stage and ripening stage; (5) panicle length increased by 0.16%; total grain weight per panicle, effective panicle per plant and 1000-grain weight decreased by 0.35%, 3.02% and 1.23%. All the indices are not significant compared to the indices of the rice grown under ambient UV-B irradiance conditions.