高产杂交稻两优培九旱育秧苗期抗氧化系统活性的研究

以汕优63为对照,研究了旱育条件下两优培九幼苗的体内抗氧化系统的特性。显示两优培九在旱育条件下其体内三大抗氧化酶SOD、POD和CAT活性都较水育条件下高,而体内超氧阴离子含量和MDA含量和水育秧相比却没有大的差异;旱育条件下秧苗叶片内积累的脯氨酸量显著高于水育秧。这不但能提高水稻苗期抗旱能力,同时也为移栽大田后具有明显的生长优势和抗胁迫能力打下了物质基础。另外,发现秧苗培育时间过长也不利于获得高质量的秧苗,时间以30 d左右为宜。和汕优63相比,相同条件下的两优培九幼苗抗氧化系统活性较高,这也可能是两优培九高产的生理基础之一。

Study on antioxidation system in high yield hybrid rice Langyoupeijiu seedlings under dry raising conditions

Compared with Shanyou 63, the characters of antioxidation system in a new-developed rice hybrid Liangyoupeijiu seedlings under dry raising conditions was studied. The results showed that activities of SOD, POD and CAT in Liangyoupeijiu seedlings under dry raising conditions were higher than those of seedlings under water raising conditions. In terms of MDA content and producing rate of O₂^· in seedling, there were not notable differences between dry and water raising conditions. Proline content was accumulated more in seedlings under dry raising conditions than seedlings under water raising conditions. Which enhanced ability of rice at repelling dry, at the same time, made material bases for dominance growthing in field. The study suggested Liangyoupeijiu displayed its potentiality of light energy inversion better under the high activity of antioxidation system, which was one of the physiologic bases on high yield. And study suggested it was good that the time raising seedling was thirty days or can' t get good seedling.