Mutagenic effectiveness and efficiency of sodium azide in rice varieties

Abstract

This study was taken up to assess the chlorophyll spectrum induced by Sodium Azide mutagen in two ricecultivars- BPT 2231 and CO 51. The mutagenic effectiveness and efficiency of Sodium Azide across the twogenotypes were also observed. The chlorophyll spectrum observed in M2 generation of BPT 2231 is consistedof albino, xantha, chlorina, striata and xantha viridis. In CO 51, albino and xantha occupied the entire chlorophyllspectrum.  Albino was predominant in both the varieties with 1.2 per cent in BPT 2231 and 1.15 per cent in CO51 at 1mM concentration. The mutagenic frequency was higher in BPT 2231 (7.8) than CO 51 (4.0). Considerinthe efficiency of a mutagen based on lethality, seedling injury and pollen sterility, BPT 2231 recorded highervalues 2.79, 1.10 and 0.26 respectively. Like mutagenic frequency, the mutation rate of Sodium Azide washigher in BPT 2231(0.90) than CO 51 (0.40).