水稻旱育稀植高产栽培的生理生态研究 Ⅱ.早稻高产形成与生理生化特性

Physioecological study on high yielding cultivation of rice by dry raising seedling and thin spacing transplanting techniques Ⅱ.High yielding formation and its physiobiochemical properties of early rice.

本研究结果表明，旱育秧苗移栽大田后仍能保持较强的生理生化优势，从分蘖期到乳熟期，旱育秧植株的抗坏血酸氧化酶、超氧化物歧化酶、过氧化物酶、过氧化氢酶、ＡＴＰ酶和硝酸还原酶活性分别比对照高４．０９～１２．２２％、８．２２～１９．６８％、１０．１９～２４．７３％、２．７７～２２．３６％、３６．１１～１３７．５％和２６．１１～１３５．２％，丙二醛含量降低５．０４～７．１４％，膜透性相应减少２９～１６．０６％，因而抗逆性强，秧苗移栽后返青快、分蘖早、成穗率高，叶片不早衰，干物质积累多，高产．

The study shows that after transplantation, the dry raising seedlings still kept high physiobiochemical vigor. From tillering to milky stage,the dry raising plants had higher activities of ascorbate oxidase,superoxide dismutase,peroxidase,catalase,ATPase and nitrate reductase,but lower content of malondialdehyde and lower membrane permeability than the wet raising plants,indicating that dry raising plants had a strong adversity resistance,and thereby,they could turn green fast,tiller early,have a high productive tiller rate,keep their leaves to grow for a longer period of time,and have more dry matter accumulation and high yield.