Abstract:
The high selection pressure applied to rice breeding since it was domesticated thousands of years
ago has initiated a narrowing its genetic variability. Obtaining new rice varieties therefore
becomes a major challenge for breeders and the development of techniques to increase genetic
variability has attracted the attention of various research groups. Understanding mutations and
their application has paved the way for the interpretation of immersion tolerant rice. Creating
variability through mutations has therefore become the most important tool for rice
improvement. Gamma-rays were able to create genetic variables for abiotic stress tolerance, such
as submergence tolerance as well as plant height, number of tillers, shoot and root weight, total
biomass, and panicle length. Among the three parents of BRRI dhan52, Guti swarna and Mamun
swarna, the highest average yield plant-1 (46.56 g) was produced by Mamun swarna (cont.) and
the lowest (18.16 g) by BRRI dhan52. On the other hand, the group of all mutants, Mamun
swarna-250 (M3) was more productive (39.30 g) and the maturation was 142.66 days from Guti
swarna-300 (M3) (20.20 g) and maturity duration was 151.66 days. The first three principal
components studied, including the Eigen value, explained 80.4% of the total variation in 11 rice
genotypes for 9 quantitative traits. The gene diversity value of allele across 11 genotypes was
0.469. The value of polymorphism information content (PIC) was 0.359 (SC34 / RM23679) and
the allele frequency (%) was 62. However, this assessment may be effective in developing
reliable mutants for significant submergence stresses in rice.
|
