水稻三系不育系玉丰A的选育与应用

【目的】通过选育配合力高的不育系,为杂交稻配组提供丰产性好、配合力高的中间育种材料。【方法】自2001年开始,用博B与金B杂交得到的优良保持系与博A测交,并经多代回交转育培育感温籼型三系不育系。【结果】经4年7代次成对回交转育得到优良不育系玉丰A,其组配的杂交稻具有高产、抗性强和熟期适中等特点。【结论】玉丰A具有花粉败育彻底,育性稳定,不育株率和花粉不育度均为100%,农艺性状优良,开花习性好,配合力高等特点,2010年10月,玉丰A通过广西农作物品种审定委员会审定。

Breeding and application of indica rice CMS line Yufeng A

[Objective]The present study was conducted to breed high-combining ability male sterile lines for providing the intermediate breeding materials with high-yield and high-combining ability to cross with hybrid rice.[Method]Rice material Bo A was test crossed with the maintainer line derived from F10 plants of hybrid Bo B and Jin B,and the obtained testcross material was successively backcrossed for 7-generations to breed the thermo-sensitive indica rice CMS line.[Result]After four years of seven generations of backcross and selection of testcross material,the CMS sterile line Yufeng A was bred,and the combined hybrids with Yufeng A showed characteristics of higher yield,stronger resistance and moderate maturity period,etc.[Conclusion]Yufeng A has complete pollen abortion and stable fertility with 100% of sterility rate in plants and pollens.It was characterized with desirable agronomic and economical characters such as good plant type,high outcrossing rate,fine flowering habit and high combining ability,etc.Yufeng A was registered and certified by the Guangxi Crop Variety Appraisal Committee in Octorber,2010.