Purification of early maturing mutant (M3) of brown rice genotype Sigah, based on plant height and number of tillers

Brown rice has recently become more popular following an increase in people awareness for healthy life style in Indonesia. “Sigah” is one of brown rice local to West Sumatera and is in high demand for its taste and aroma. However, this rice genotype, as for other landrace, is a tall and long-lived type. Tall rice is very susceptible for lodging due to flooding or strong wind. The research was aimed at determining the stability of mutant of Sigah, brown rice genotype with desired characters i.e plant height and early maturing; plant height and number of tillers. The experiment was carried out at irrigated paddy field at Sungai Sapih Kuranji, the City of Padang from April to July 2018 using 13 mutant lines of M2 that was previously irradiated with 200 Gy gamma rays. Twenty sister lines were used as control plants. Individual selection of every single plant was conducted through the experiment. Eight early maturing mutant lines and seven plant height mutants were found for their character of number of tillers. Number of mutants according to short-statured and early maturing mutants characters are 7 and 8 mutants respectively. Early maturing mutants were recorded for mutant lines 47, 89, 53, 58, 76, 111, 4 and 68.