相同遗传背景不同植株形态水稻等基因系与杂草的竞争及化感作用  

Competition and allelopathy of rice isogenic lines having similar genetic background but different plant morphology against weed

作　　者：余柳青[1] 陆永良[1] 周勇军[1] 郭龙彪[1] 钱前[1] 

机构地区：[1]中国水稻研究所水稻生物学国家重点实验室,杭州310006

出　　处：《应用生态学报》2005年第4期721-725,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目 (3 0 170 62 0 );国家"十五"科技攻关资助项目 (2 0 0 1BA5 0 9B0 7)

摘　　要：利用相同遗传背景不同株形水稻浙辐80 2等基因系为材料,研究了IG1、IG4、IG2 5和IG2 6与无芒稗的竞争和化感作用潜力,探索了二者之间的相互关系.结果表明,IG1和IG4的植株高度和分蘖角度显著大于IG2 5和IG2 6 ,但它们的根系活力却显著小于IG2 5和IG2 6 .IG1和IG4对无芒稗生物量干重抑制率分别达到15 %和17% ,显著高于IG2 6的6 4 % ,表明水稻与无芒稗竞争力与水稻植株高度和分蘖角度成正比,而与水稻根系活力成反比.IG1叶片水浸提液对无芒稗根长抑制率为77 .6 % ,显著高于非化感对照品种秀水6 3,而植株形态相近的IG4的化感作用却未达到显著水平,显示在相同遗传背景下水稻化感作用强弱与水稻株型无相关性.Zhefu 802 rice isogenic lines IG1,IG4,IG25 and IG26 have the same genetic background but different plant morphology.This paper studied their competition and allelopathy against barnyardgrass.The results showed that IG1 and IG4 had higher plant height,bigger tiller angle and less root vitality than IG25 and IG26,and provided 15% and 17% control of barnyardgrass plant dry weight,which were significantly higher than IG26.The competition ability of test rice isogenic lines against the weed was positively correlated with their plant height and tiller angle,but negatively correlated with their root vitality.The inhibition rate of the water extract of IG1 leaves on barnyardgrass root length was 77.6%,significantly higher than that of non-allelopathic material Xiushui 63,while the IG4 which has the similar plant morphology with IG1 didn't show any significant allelopathy.It seems that there were no correlations between allelopathy and morphological characters of rice under the same genetic background.

关 键 词：化感作用 遗传背景 等基因系 植株形态 水稻 杂草 分蘖角度 植株高度 根系活力 无芒稗 相互关系 水浸提液 对照品种 显著水平 抑制率 802 生物量 竞争力 相关性 干重 根长 株型 

分 类 号：S451.1[农业科学—植物保护]