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研究了水稻 (OryzasativaL .)幼苗叶片生长过程中叶绿素荧光和类胡萝卜素各组分含量的变化以及它们对高光胁迫的响应。结果表明 :随着叶片的衰老 ,光合速率、类胡萝卜素不同组分及总的类胡萝卜素含量和叶黄素循环库下降 ;不同叶龄的叶片经高光胁迫后 ,第 5叶 (成熟叶 )qN增加的幅度比第 6叶 (幼嫩叶 )和老叶 (第 3和 4叶 )大 ;与高光胁迫前相比 ,第 3、4、5和 6叶光系统Ⅱ激发压 (1-qP)分别增加了 4 4 %、5 7%、19%和 4 5 % ;第 5叶具有高胡萝卜素含量和高紫黄质到玉米黄质的转化 ,这与其呈现较强的抗高光胁迫相一致。水稻叶片抵御光抑制的能力与类胡萝卜素水平和类胡萝卜素的生物合成能力以及叶片所处的生长时期相关。
The changes of chlorophyll fluorescence and carotenoid content in the leaves of rice (Oryzasativa L.) seedlings and their responses to high light stress were studied. The results showed that with the leaf senescence, photosynthetic rate, carotenoid content, total carotenoid content and lutein cycle sink decreased. After high light stress, leaf number 5 (mature leaf) qN increased more than that of leaf 6 (young leaves) and old leaves (leaves 3 and 4). Compared with those before light stress, photosynthetic rate of 1-qP ) Were increased by 4 4%, 5 7%, 19% and 45%, respectively; the fifth leaf had a high carotenoid content and the conversion of homoaflavonia to zeaxanthin, consistent with its strong resistance to high light stress . The ability of rice leaves to resist photoinhibition correlates with the level of carotenoids and the biosynthetic capacity of carotenoids and the growth period in which the leaves are located.