Author(s):

Andrew-Peter-Leon MT, M Arumugam Pillai, Kumar KK, R Pushpam and R Kannan

Abstract: Improved White Ponni (IWP) is a popular rice variety in south India. We have developed WP-22-2, a semi-dwarf mutant of Improved White Ponni through gamma-ray induced mutation breeding. Gibberellin sensitivity of the mutant was studied by spraying 50 μM GA₃ hormone on ten days old seedlings and after three days, seedling height, 1^st internode and 2^nd leaf lengths were measured. The variances between the treatments were compared using Student’s t-test. The IWP was 2.54 cm taller than the untreated mutant. The 1^st internode length between the two varied with high significance (P = .003). The GA₃ treatment has increased the seedling height of the mutant 6.0 cm in three days. The reversion of plant height in the mutant showed that the mutations in the GA₃ pathway have caused defective gibberellin production which ultimately reduced the plant height in the mutant.

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