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Marker-Assisted Pyramiding of Genes Conferring resistanceAgainst Bacterial Blight and Blast Diseases into Indian riceVariety MTU1010

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rice science 2016年第6期23卷 306-316页

作者： k.arunakumari c.v.durgarani v.satturu k.r.sarikonda p.d.r.chittoor b.vutukuri g.s.laha a.p.k.nelli s.gattu m.jamal a.prasadbabu s.hajira r.m.sundaram Institute of Biotechnology Professor Jayashankar Telangana State Agricultural UniversityRajendranagarHyderabad 500030India Andhra Pradesh rice research Institute Acharya N.G.Ranga Agricultural UniversityMaruteruWest Godavari District 534122India Agriculture research Station Acharya N.G.Ranga Agricultural UniversityNellore 524004India Crop Improvement Section ICAR-Indian Institute of Rice ResearchRajendranagarHyderabad 500030India Urmatt Ltd.Wang Chai Chaingrai 57210Thailand

Two major bacterial blight （BB） resistance genes （Xa21 and xa13） and a major gene for blastresistance （Pi54） were introgressed into an Indian rice variety MTU1010 through marker-assistedbackcross breeding. Improved Samba Mahsuri （possessing Xa21 and xa13） and NLr145 （possessingPi54） were used as donor parents. Marker-assisted backcrossing was continued till BC2 generationwherein PCr based functional markers specific for the resistance genes were used for foregroundselection and a set of parental polymorphic microsatellite markers were used for background selectionat each stage of backcrossing. Selected BC2F1 plants from both crosses, having the highest recoveriesof MTU1010 genome （90% and 92%, respectively）, were intercrossed to obtain intercross F1 （ICF1） plants,which were then selfed to generate 880 ICF2 plants possessing different combinations of the BB andblast resistance genes. Among the ICF2 plants, seven triple homozygous plants （xa13xa13Xa21Xa21Pi54Pi54）with recurrent parent genome recovery ranging from 82% to 92% were identified. All the seven ICF2plants showed high resistance against the bacterial blight disease with a lesion lengths of only 0.53–2.28 cm, 1%–5% disease leaf areas and disease scoring values of ‘1’ or ‘3’. The seven ICF2 plants wereselfed to generate ICF3, which were then screened for blast resistance, and all were observed to behighly resistant to the diseases. Several ICF3 lines possessing high level of resistance against BB andblast, coupled with yield, grain quality and plant type on par with MTU1010 were identified and advanced forfurther selection and evaluation.

关键词： gene pyramiding bacterial blight resistance blast resistance rice marker-assistedbackcross breeding

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