水稻抗白叶枯病隐性基因xa-5的转育技术研究

On transfer technique of recessive resistant gene xa-5 for rice bacterial blight:

选用全生育期抗病的早粳Ｇ３８为抗源供体，成株期抗病的晚粳秀水１１为轮回亲本，经连续回交和自交隔代回交的两种方法转育隐性抗性基因ｘａ－５。本研究阐述了两种转育方法的技术路线、技术关键及优缺点，为转育隐性基因提供借鉴。同时调查了育成晚粳品系Ｄ６０１、Ｄ６０２和Ｄ６０３的农艺性状及对我国水稻白叶枯病菌的抗性反应，认为可以作为抗病亲本应用于水稻抗白叶枯病育种。

Using early japonicaline G38 with resistance to bacterial blight at all growth stages (AGS) as resistance-donor and late japonica variety Xiushui 11 with resistance at adult stage(AS) as recurrent parent, a recessive gene xa-5 was transferred by successive backcross or backcross after selfcross procedures. This paper expounded the technical strategy and technical key and advantagesor shorts of the two transfer methods, to provide experience of transferring recessive gene. Meanwhile, resistance of three late japonica lines D601, D602 and D603 to the strains in China and some major agronomic characters were investigated. The use of D601, D602 and D603 as resistant parents in bacterial blight breeding was preferred.