Efficiency and Effectiveness of Gamma Rays and EMS in Rice

Relative effectiveness and efficiency of single and combination treatments using gamma rays and sodium azide in inducing chlorophyll mutations in rice.

“…These results support the findings of Rao (1977) and Madhusudhana Rao and Manmada Rao (1983). Of the three varieties, Jaya and IET 5656 recorded a higher frequency of chlorophyll mutants than Fujimi nori in single as well as in combination treated populations.…”

Mutagenic efficiency, effectiveness and factor of effectiveness of physical and chemical mutagens in rice.

“…On an average, the frequency of chlorophyll mutations was almost similar in physical and chemical mutagens in Tella hamsa. These results support the findings of Ratho and Jachuck (1971), Rao (1977). The results obtained in IR-24 are quite different from that of Tella hamsa.…”

“…Caldecott (1961) showed a close relationship between the decrease in M1 seedling height and chlorophyll mutation frequency in M2 generation. Masken and Vanderveen (1968), Sampath (1973) and Rao (1977) studying the effect of physical and chemical mutagens on seed fertility in relation to chlorophyll mutation frequency proposed that the frequency of muta tion was completely independent of the degree of seed fertility. Kivi (1965), Walther (1969) and Sharma and Bansal (1970) demonstrated a definite relationship between M1 fertility class and frequency of chlorophyll mutations.…”

EMS Induced Mutants of Upland Rice Variety Nagina22: Generation and Characterization

“…This was undertaken for two main reasons: (i) EMS mutagenesis gives high point mutation densities by base substitution with a low level of chromosome breaks and thus less of aneuploidy, sterility and dominant lethality (Rao 1977;Vidal et al 1995;Bentley et al 2000). Base substitutions either in the transcribed regions or in the regulatory elements of a gene might alter gene function leading to creation of a series of alleles of a gene.…”