STUDIES ON GENETICS AND VALIDATION OF MOLECULAR MARKERS LINKED TO LODGING RESISTANCE LOCI IN ELITE RICE LINES

M. GIRIJA RANI¹*, P.V. SATYANARAYANA^2
1Andhra Pradesh Rice Research Institute and Regional Agricultural research Station, Maruteru, West Godavari district, 534122, India
²Acharya N G Ranaga Agricultural University, Andhra Pradesh, 522034, India
* Corresponding Author : girija_aprri@yahoo.co.in

Received : 20-09-2018     Accepted : 27-09-2018     Published : 30-09-2018
Volume : 10     Issue : 9       Pages : 498 - 500
Genetics 10.9 (2018):498-500

Keywords : Bulked segregant analysis, lodging resistance, Genetics, Rice
Conflict of Interest : None declared
Acknowledgements/Funding : Authors thankful to Acharya N. G. Ranga Agricultural University, Lam, 522034, Andhra Pradesh for providing funds to carryout research through Rastriya Krishi Vikas Yojana
Author Contribution : All author equally contributed

Stem lodging risk is the major limiting factor for rice productivity in coastal areas. Selection of lodging resistant lines in early generation is a herculean task as it is influenced by structural and weather parameters. Present study aimed to study genetics and to validate markers linked to lodging resistant loci using F2 and F3 lines of highly susceptible mega rice variety Swarna (MTU 7029) and elite lodging resistant lines II 110-9-1-1-1-1 and MTU 1121. Studies on genetics of lodging resistance indicated modified epistatic dihybrid ratio of 9:7 in both crosses for lodging susceptible and resistant lines revealing complementary epistatic interactions of lodging resistant loci. RM 20557 and RM 5509 were found to be associated with percent of lodging, culm strength and culm diameter in F2 of MTU 7029/II 110-9-1-1-1-1. While in another cross MTU 7029/MTU 1121, RM 6933 was found to be linked with culm strength and culm diameter. Identified markers linked to lodging resistant traits were confirmed by genotyping and phenotyping of F3 families, back crosses and markers RM 20557 and RM 5509 were found to be associated with lodging resistance related traits even in other genetic back grounds. Adoption of marker assisted selection would help in fixing favorable alleles of lodging resistant loci as epistatic gene interactions were involved in both the crosses.

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