摘要
选择黄淮平原地区当前主推品种郑麦9023,以及早期引进品种阿勃和丰产3号为材料,利用微根管技术,研究冬小麦活根长和根直径径级的分布动态,以及以活根长为基础的净生长速率的变化规律.结果表明:根直径为0.05～0.25mm的细根是冬小麦根系的主要组成部分,根直径≤0.5mm的细根占活根长的98%以上;冬小麦的平均根直径随着生育进程不断变化,其变化范围为0.15～0.22mm,不同品种之间没有显著差异;活根长与根尖数呈显著正相关,表明根尖数是活根长增加的主导因素;返青期到拔节期是冬小麦根系生长最旺盛的时期,阿勃和丰产3号具有较长时期的根系增长活力,郑麦9023自拔节期以后根直径≥0.1mm的细根根尖数占总根尖数的比例有所上升,这有利于提高生育后期根系抗性和保证根系活性稳定,以满足籽粒灌浆的需要.
Selecting one presently popularized winter wheat cultivar（Zhengmai 9023） and two cultivars（Abo and Fengchan 3） introduced in the 1950s and 1960s in Huang-Huai Plain as test materials,and by using minirhizotron technique,this paper studied the live root length,root diameter distribution,and net root growth rate of the cultivars.Fine roots with a diameter from 0.05 mm to 0.25 mm occupied the majority of the whole root system,and the fine roots with a diameter less than 0.5 mm accounted for 98% of the live root length.The average root diameter varied with plant growth,the variation range being 0.15-0.22 mm,and no significant difference was observed among the cultivars.The live root length was significantly positively correlated root number,suggesting that root number was the main factor for the increase of live root length.The most vigorous growth period of the roots was from reviving to jointing stage,and Abo and Fengchan 3 had a longer period increased root vitality,as compared with Zhengmai 9023.For Zhengmai 9023,its fine roots with a diameter more than 0.1 mm had an increasing proportion after jointing stage,which was helpful for improving plant resistance,root activity,and grain-filling at late growth stages.
出处
《应用生态学报》
CAS
CSCD
北大核心
2012年第7期1832-1838,共7页
Chinese Journal of Applied Ecology
基金
现代农业产业技术体系建设专项资金(CARS-3-1-30)
公益性行业(农业)科研专项(201203077)资助
关键词
微根管
品种
冬小麦
根系发育
minirhizotron
cultivar
winter wheat
root development.
