渍水对油菜抽薹期叶片光合参数及产量的影响

摘要

以中双9号和华油杂668号油菜品种为材料,通过小区试验研究抽薹期不同渍水时间对油菜叶片光合参数和实际产量的影响° 结果表明,渍水7 d,两个品种油菜净光合速率(Pn)变化趋势一致;渍水14 d,中双9号叶片Pn快速下降至9.00μmol∕(m2·s),渍后仍有一定的恢复能力,渍水10 d华油杂668号叶片Pn稍有降低,随后恢复提高,叶片Tr、Gs、Ci的变化趋势与叶片Pn一致;渍水17 d,中双9号叶片黄化早衰,叶片Pn仅有1.02μmol∕(m2·s),叶片Ci明显提高,华油杂668号叶片Pn为18.71μmol∕(m2·s),表现出良好的耐渍能力;随着渍水时间延长,中双9号叶片水分利用率(W UE)明显低于华油杂668号;不同渍水时间处理中双9号均比华油杂668号减产严重;抽薹期华油杂668号的耐渍能力强于中双9号.%A plot experiment was conducted to study effects of different waterlogging durations on leaf photosynthetic parame-ters and actual yields of oilseed rape at the bolting stage,in which two varieties of oilseed rape,namely,Zhongshuang 9 and Huayouza 668,were used as the experimental materials. According to the results,after 7 days of waterlogging,the net photosyn-thetic rates (Pn﹚ of the two varieties showed the same changing trend; After 14 days of waterlogging,the Pn of the leaves of Zhongshuang 9 went down rapidly to 9.00μmol∕(m2·s﹚,with the recovery ability still remaining at a certain level. While after the waterlogging for 10 days,the Pn of Huayouza 668 dropped slightly and then recovered and went up,with Tr,Gs and Ci in its leaves reflecting changing trends consistent with that of the Pn. After 17 days of waterlogging,etiolation and premature ag-ing occurred to leaves of Zhongshuang 9,with Pn in leaves being only 1.02μmol∕(m2·s﹚ and Ci increasing significantly,while Pn in leaves of Huayouza 668 was 18.71μmol∕(m2·s﹚,demonstrating a high waterlogging tolerance. With the waterlogging du-ration getting longer,the water use efficiency (W UE﹚ of Zhongshuang 9 was way lower than that of Huayouza 668; In all the waterlogging durations,the yield of Zhongshuang 9 declined much more seriously than that of Huayouza 668; At the bolting stage, Huayouza 668 had a higher waterlogging tolerance than Zhongshuang 9.