干旱胁迫下杂草稻和栽培稻种子萌发及幼苗根的部分生长和生理生化指标的比较

Comparison on seed germination and some growth and physiological and biochemical indexes of roots of seedlings of Oryza sativa f.spontanea and O.sativa under drought stress

对质量体积分数15%聚乙二醇6000模拟干旱胁迫下江苏泰州和广东茂名的杂草稻(Oryza sativa f.spontanea Roschev.)和栽培稻(O.sativa Linn.)的种子萌发及幼苗根的部分生长和生理生化指标的相对值进行比较。结果表明:总体来看,干旱胁迫下4个材料种子萌发指标的相对值低于100%,且同一产地杂草稻和栽培稻间的指标差异不显著。除相对根表面积外,干旱胁迫下4个材料其他根生长和生理生化指标的相对值基本上高于100%,且同一产地杂草稻和栽培稻间的多数指标差异显著。研究结果显示:干旱胁迫下,杂草稻和栽培稻的种子萌发受到抑制,但根的生长和生理生化指标总体上不同程度升高;与栽培稻相比,杂草稻的种子萌发无明显优势,但幼苗根的生长和生理生化指标差异明显。

The relative values of seed germination and some growth and physiological and biochemical indexes of roots of seedlings of Oryza sativa f.spontanea Roschev.and O.sativa Linn.from Taizhou of Jiangsu and Maoming of Guangdong were compared under drought stress simulated by polyethylene glycol 6000 with mass volume ratio of 15%.The results show that,in general,the relative values of seed germination indexes of four materials under drought stress are lower than 100%,and the differences in indexes between O.sativa f.spontanea and O.sativa from the same locality are not significant.Except for relative root surface area,the relative values of other growth and physiological and biochemical indexes of roots of four materials under drought stress are basically higher than 100%,but the differences in most indexes between O.sativa f.spontanea and O.sativa from the same locality are significant.It is suggested that,under drought stress,the seed germination of O.sativa f.spontanea and O.sativa are constrained,but the growth and physiological and biochemical indexes of roots increase generally to different degrees;compared with O.sativa,the seed germination of O.sativa f.spontanea has no evident dominance,but there are evident differences in growth and physiological and biochemical indexes of roots of its seedling.