International Journal of Animal Breeding and Genetics ISSN: 2756-3650 Vol. 10 (3), pp. 001-007, March, 2021. © International Scholars Journals
Full Length Research Paper
Identification and genetic mapping of elongated uppermost internode gene ‘eui’ with microsatellite markers in rice (Oryza sativa L.)
Pawan Khera1*, M. G. Gangashetti1, 2, Sukhpal Singh1,3, K. Ulaganathan4, H. E. Shashidhar1 and W. H. Freeman1
1Barwale Foundation, Research and Training Centre, Hyderabad, India.
2Pioneer Overseas Corporation, Hyderabad, India.
3Advanta India Limited, Hyderabad, India.
4Centre for Plant Molecular Biology, Osmania University, Hyderabad, India.
Accepted 09 December, 2020
Development of cytoplasmic male sterile (CMS) lines with elongated uppermost internode (EUI) trait is a desirable alternative to eliminate the use of GA3 in hybrid rice production. In this study, a simple and reliable PCR based, simple sequence repeats (SSR) markers was identified, for the eui gene to facilitate marker assisted selection (MAS). A total of 28 SSR markers, mapped in the vicinity of the genomic clone AC130605 (PD0010D04), were chosen for assessing the polymorphism between IR58025B and IR91-1591-3. A set of 151 F2 plants derived from the cross IR58025B/IR91-1591-3 were surveyed using 15 polymorphic SSR markers. Analysis using MAPMAKER 3.0 revealed that seven SSR markers viz., RM6054, RM3870, RM3476, RM5970, RM7801, RM7446 and RM3620 were linked with eui locus at the genetic distance ranging from 1.0 to 7.1 cM with EUI phenotype. Furthermore, these markers were validated in – F2 (IR58025A/IR91-1591-3) and backcross (IR58025B/IR91-1591-2//IR58025B) population segregating for eui gene. The SSR markers reported in this study might be useful for the incorporation of eui gene into CMS lines of rice through marker-assisted backcrossing.
Key words: Rice, cytoplasmic male sterility, elongated uppermost internode, microsatellites, marker assisted selection, panicle exsertion.