中国水稻科学2016，Vol.30Issue(6)：626-636,11.DOI:10.16819/j.1001-7216.2016.6057
剪根处理对不同秧龄杂交稻幼苗生长及生理特性的影响
Effects of Root-cutting Treatment on Growth and Physiological Characteristics of Hybrid Rice at Different Seedling-ages
摘要
Abstract
Supper hybrid rice F you 498 was used to investigate the effects of seedling-age (25 days old and 40 days old) and root-cutting (1/3,2/3 and the whole root were cut off with no root-cutting as control)on the root response 0-48 hours and 1 -29 days after root cutting,as well as dynamics of biomass accumulation,root morphology and nitrogen (N)absorption in a hydroculture experiment.The results showed that rice seedlings at various seedling ages responsed diversely to root-cutting.The proline content and soluble sugar content of the above-ground part had a significant peak after root-cutting,which was higher and reached the peak value in shorter time with the increase of the root-cutting ra-tio.The physiological resistance and resilience after root-cutting of 25-day seedling-age were superior to that of 40-day old seedling.In the views of root-cutting ratio,1/3 root-cutting had positive effect on seedling growth.Compared to the control,the root length,root surface area,above-ground biomass,root biomass,nitrogen accumulation amount and root shoot ratio were higher 22 days after 1/3 root-cutting for 25-day old seedling.However,the root surface area in the whole growth stage decreased with the increaing root-cutting ratio for 40-day old seedling.The root-shoot ratio was higher than that of control 22 days after 1/3 root-cutting,and the above-ground biomass,root length,nitrogen accumulation amount and nitrogen content were also higher than those of control 29 days after 1/3 root-cutting.Be-sides,the root damage might inhibite the seedling growth and restrain the absorption of nutrients,which could affect the growth and development of rice seedling.关键词
杂交稻/秧龄/剪根/生理特性Key words
hybrid rice/seedling-age/root-cutting/physiological characteristics分类
农业科技引用本文复制引用
李应洪,王海月,严奉君,李娜,孙永健,代邹,谢华英,马均..剪根处理对不同秧龄杂交稻幼苗生长及生理特性的影响[J].中国水稻科学,2016,30(6):626-636,11.基金项目
国家科技支撑计划资助项目(2013BAD07B13) （2013BAD07B13）
四川省教育厅重点项目(16ZA0044) （16ZA0044）
四川省科技支撑计划资助项目(2014NZ0040,2014NZ0041,2014NZ0047) （2014NZ0040,2014NZ0041,2014NZ0047）
四川省育种攻关专项(2011NZ0098-15) （2011NZ0098-15）
