水稻减数分裂期颖花中激素对水分胁迫的响应

被引：27

作者：

杨建昌

刘凯

张慎凤

王学明

王志琴

刘立军

机构：

[1] 扬州大学江苏省作物遗传生理重点实验室

来源：

作物学报 | 2008年 / 01期

基金：

国家科技攻关计划;

关键词：

水稻; 减数分裂; 水分胁迫; 脱落酸(ABA); 乙烯; 颖花不育;

D O I：

暂无

中图分类号：

S511 [稻];

学科分类号：

摘要：

以旱A-3（HA-3,抗旱性品种）和武运粳7号（WY-7,干旱敏感品种）为材料,在减数分裂期（抽穗前15～2d）进行充分灌溉（WW）和土壤水分胁迫（WS）处理。结果表明,WS处理显著降低叶片水势,但穗水势没有变化。WS处理的颖花不孕率,WY-7较WW增加58.5%50.9%,HA-3仅较WW增加12.6%12.8%。颖花中的玉米素+玉米素核苷、吲哚-3-乙酸和赤霉素（GA1+GA4）浓度在WW与WS处理间以及在两品种间无显著差异。WS显著增加颖花中脱落酸（ABA）、乙烯和1-氨基环丙烷-1-羧酸浓度。WY-7乙烯的增加超过ABA的增加,而HA-3乙烯与ABA增加量大致相等。在减数分裂早期对WS稻穗施用氨基-乙氧基乙烯基甘氨酸（乙烯合成抑制剂）和ABA,颖花的不孕率显著降低;施用乙烯利（乙烯释放促进物质）和氟草酮（ABA合成抑制物质）,结果则相反。上述结果说明,在减数分裂期遭受水分胁迫,内源ABA和乙烯的相互拮抗作用调控颖花的育性,较高ABA与乙烯的比值是水稻适应水分逆境的一个生理特征。

引用

页码：111 / 118

页数：8

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