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International Journal of Plant Breeding and Genetics

Year: 2011 | Volume: 5 | Issue: 4 | Page No.: 339-348
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Authors

M. Arumugam Pillai

Susan Eapen

K. Yasin Jeshima

K. Anandhi

B. Selvi

Keywords

Among the various factors limiting rice yield, salinity is one of the oldest and most serious environmental problems in the world. The available rice germplasm has limited variability for salt tolerance. Hence, the study was to develop salt tolerant rice varieties by inducing variability through mutation and selecting high yielding salt tolerant mutants. Variability and correlation studies were conducted to isolate salt tolerant mutants from two rice varieties ADT 43 and ASD 16. Gamma irradiated (10, 20, 25, 30, 40 and 50 kR) salt tolerant mutants were identified in M2 generation. M3 and M4 generations of the mutant population were investigated for correlation among yield and its components which can be utilized for selection. Altered conditions were observed in the mutant population when compared to the unaltered population depending on the dose, genotype and the character pairs. Morphologically stable salt tolerant mutants till M5 were selected based on the characters identified using correlation studies and for increased yield. Seed yield of mutant lines showed an increase upto 446.94 (20 kR of ADT 43) which was higher than the parental varieties (255.56 and 384.13 for ADT 43 and ASD 16). The number of tillers, panicle length and plant height were also much higher in some mutants than in parent varieties. Results on yield and contributing characters possesses sufficiently high values of heritability and genetic advance which can be utilized for further improvement in rice and in evolving a high yielding saline tolerant variety.
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