早稻-再生稻头季稻不同育秧方式秧苗素质及生理生化特性（Ⅰ） ——杂交水稻高产突破的生理生态与调控技术研究

通过对常规栽培模式湿润育秧苗与超高产栽培模式旱育秧苗的秧苗素质、根系性状、生理生化特性等的研究，探讨了不同栽培模式中育秧方式对水稻产量的影响，以揭示超高产栽培模式实现高产的生理原因。结果表明，超高产栽培模式下旱育秧苗的干物质积累和分蘖数比湿润育秧苗高22.78%、73.33%，而株高比对照矮14.91%，同时还表明，超高产栽培模式下旱育秧的根系还原力强、发根数多、发根能力强，硝酸还原酶、ATP酶、叶绿素及过氧化氢酶、过氧化物酶、超氧化物岐化酶等细胞保护酶含量增加，表现出强大的生理生化优势，而丙二醛含量比对照降低20.99%，可溶性糖和硝态氮含量增多，C/N适中，有利于提高旱育秧苗的抗逆性，是旱育壮秧形成的内在生理基础。

Quality and Physiobiochemical Characteristics of the First Rice Crop Seedlings under Different Raising Seedling Patterns for Early Rice and Its Ratoonal Crop (Ⅰ)-Studies on super high-yield ecophysiology and its regulation technology in hybridize rice

In compare of the two raising seedlings patterns: dry-raising seedlings in super high-yield cultivation practice and wet-raising seedlings in tradition one, this paper studied their performance of rice seedling quality, root and physiobiochemical characteristic, to search for the influence of the different raising seedlings patterns upon the rice yield, aiming to clarify the physiobiochemical reason of super high-yield under super high-yield cultivation practice. The study showed that the dry-raising seedlings of super high-yield cultivation had more dry matter accumulation and tillers,but lower height of plant than the wet-raising seedlings. It also indicated that in comparison with the wet-raising seedlings, the dry-raising seedlings had more developed root systems with the stronger abilities of deoxidization, and exhibited the higher activities of nitrate reductase(NR), ATPase, and cell protective enzymes such as catalase(CAT), peroxidase(POD), superoxide dismutase(SOD) and higher content of chlorophyll, but lower content of malondialdehyde(MDA), performing the stronger ability resistant to environmental stress, being advantageous to the formation of dry-raising seedlings.