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New plant type trait characterization and development of core set among indica and tropical japonica genotypes of rice

  • B. Jyothi (a1), B. Divya (a1), L. V. Subba Rao (a1), P. Laxmi Bhavani (a1), P. Revathi (a1), P. Raghuveer Rao (a1), B. Rachana (a1), G. Padmavathi (a1), J. Aravind Kumar (a1), C. Gireesh (a1), M. S. Anantha (a1), R. Abdul Fiyaz (a1), C. Suvarna Rani (a1) and A. R. G. Ranganatha (a1)...

Abstract

This study was conducted to characterize new plant type (NPT) traits among 650 genetically diverse rice genotypes of tropical japonica and indica and to establish an initial core set for NPT traits. Analysis of variance revealed highly significant differences among the genotypes for all the traits assessed except flag length and width and leaf angles. Dendrogram categorized the genotypes into five distinct duration groups. Genotypes viz., Pumphamah, IRGC5097, IRGC37015, IRGC43741, IRGC50448, IRGC53089, IRGC39111, IRGC18021, Haorei Machang, IRGC44069, IRGC8269, Thangmoi, IRGC33130 and IRGC29772 were identified as possessing strong culm. Long panicles with a length of more than 35 cm were found in IRGC8269, IRGC9147, IRGC14694, IRGC19642, IRGC27435, IRGC39111, IRGC31051, IRGC26011and IRGC25892. Ideal leaf angle of NPT genotypes of 5°, 10° and 20° of flag leaf, 1st and 2nd leaves was not found in any genotype but with a combination of 5°, 10° and 10° was observed in IRGC63102 and IRGC66644. NPT flag leaf length and width of 50 and 2 cm, respectively, was seen in ‘Kemenya Kepeu’ and ‘IRGC29772’. High grain number of more than 350 was observed in IRGC53089, IRGC31063 and Azhoghi. A total of 72 genotypes were found with a combination of one or more ideal plant type traits of which, hierarchical cluster analysis based on genetic distances selected 32 as NPT core set. This core set will serve as an ideal genetic resource for breeding programs aimed at NPT development.

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Corresponding author

*Corresponding author. E-mail: jyothi_rishik@yahoo.com

References

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