Genetic Analysis of M5 Generation of Gamma Irradiated Red Rice (Oryza sativa L.) Mutant lines
Lekha P. S.
Department of Genetics and Plant Breeding, College of Agriculture, Navile, India.
Amoghappa Jakkaral Shridevi
AICRP on Rice, Zonal Agricultural and Horticultural Research Station, Brahmavar KSN University of Agricultural and Horticultural Sciences, Irruvakki, Shivamogga, India.
Nachiketha T. K. *
Department of Genetics and Plant Breeding, College of Agriculture, Navile, India.
Dushyantha Kumar
Department of Genetics and Plant Breeding, College of Agriculture, Navile, India.
B. Halingali I.
Department of Genetics and Plant Breeding, College of Agriculture, Navile, India.
Jayashree S.
Department of Genetics and Plant Breeding, College of Agriculture, Navile, India.
*Author to whom correspondence should be addressed.
Abstract
In rice, induced mutations play a significant role in development of semi dwarf and high yielding variants. The genetic variability induced by four Gamma rays treatments was studied in traditional red rice variety Kajejaya in Randomized complete block design with two replications during Kharif 2021. Analysis of variance documented Gamma rays treatment brought significant variability and exhibited a wide range of values for all traits. Six superior mutants(T35-L-06, T35-L-17, T35-L-15, T45-L-07 T45-L-13 and T45-L-06) exhibited more number of productive tillers/plant, panicle length, number of filled grains/panicle, high test weight and higher grain yield/plant and T45-L-13, T45-L-06 and T35-L-15 mutants took lesser days to mature(114,117.5 and 118 days) and exhibited reduced plant height(84, 80 and 72cm) compared to untreated parent check. Induced mutations were effective in creating variability in plant height and maturity duration along with increased mean of reproductive components at higher doses (35kR and 45kR) as compared to lower doses(15kR and 25kR).
Keywords: Traditional red rice, gamma rays, induced variability, semi-dwarf, earliness