根际微生物对冬小麦根系发育及产量性状的影响

Effects of Root Microbes on Root Development and Yield Related Characters in Winter Wheat

对从冬小麦根际分离获得的微生物菌株进行了室内两种介质栽培试验和田间试验。结果表明 ,采用蛭石 +田土 +适量磷酸二铵、尿素栽培介质试验结果与田间小区试验结果相一致 ,而采用纯蛭石的栽培结果则相差较大 ;根际微生物主要对冬小麦根长、根干重、根系活力、冬前分孽、有效穗数等产量性状有明显的促进作用 ,对千粒重、穗粒数影响不大 ;筛选到一株优良的根际微生物链霉菌St56,田间小区试验条件下 ,可使冬小麦的根长、根干重、根系活力、冬前分蘖、有效穗数及终产量分别比对照提高 11 33 % ,15 37% ,18 52 % ,19 37% ,12 2 8%和 15 64 %。

Root microbes strains isolated from winter wheat root were used i n experiments with different media and growing conditions.The results indicated that:1) There was no significant difference between cultivations vermiculite+soil+(NH4)2HPO4+urea medium and field condition,while the da ta got under vermiculite only were quite different from that in the field.2) Roo t microbes had distinct promoting effects on some yield related characters such as root length,root dry weight,root activities,the number of tiller and effectiv e ears .However，microbe effects were subtle on weight per thousand grains and grains per ear.3) An effective strain, Streptomyces sp.St56,was selected.Under field conditions,the strain increased the root lengt h,root dry weight,root activities,number of tiller,number of e ffective ears and yield by 11.33%,15.37%,18.52%,19.37%,12.28% and 1 5.64% respectively.