Genetic variability and frequency distribution studies in F2 population involving traditional variety mappillai samba

Abstract

An experiment was performed to analyse the variability parameters and frequency distribution properties in F 2 population of CBMAS 14065 x Mappillai Samba for grain yield and its associated parameters. The estimated genetic parameters showed, slightly higher PCV than GCV reflecting the influence of environment. High GCV, high PCV, high heritability along with high genetic advance as per cent of mean was observed in the number of filled grains per panicle suggests the additive gene action which is important for selection. The parameters like plant height, the number of productive tillers per plant, panicle length, the number of filled grains per panicle and thousand grain weight showed a significant positive correlation with single plant yield. Significant positive skewness were observed for the number of productive tillers and grain L:B ratio which helps in fixing the selection criterias and benefits the improvement of traits in F 2 generation.

Genetic variability and diversity analysis in selected rice (Oryza sativa L.) varieties

“…Similar findings were reported in rice byBhargava et al (2021) andFathima et al (2021) for plant height, the number of productive tillers per plant, the number of grains per panicle and single plant yield;Nikhitha et al (2020) andSingh et al (2021) for plant height. But panicle exhibited high heritability (69.49%) and moderate GAM (12.88%) (Table3) which were in accordance withNikhitha et al (2020),Bhargava et al (2021) andSingh et al (2021) in rice.…”

Estimation of genetic parameters and character association for yield and quality traits in BC1F2 population of rice (Oryza sativa L.)

“…However, low PCV and GCV were recorded for days to first flowering, thousand grain weight, kernel length before cooking and breadthwise elongation ratio which indicates that lower variation may be due to a narrow genetic base. These results were in accordance with Divya et al (2018) and Nikhitha et al (2020) for days to first flowering.…”

“…Low heritability and GAM were found in kernel breadth before cooking, length-breadth ratio, kernel breadth after cooking and alkali spreading value which indicates that the expression of these traits is highly influenced by the environment. Similar observations were recorded by Behera et al (2018) and Nikhitha et al (2020) for length-breadth ratio.…”

“…Similarly, days to first flowering exhibited a significant positive correlation with single plant yield. A similar association of these traits with single plant yield was reported by Muthuvijayaragavan and Murugan (2020) and Nikhitha et al (2020). In the backcross population I, plant height and length-breadth ratio were found to have a highly significant and positive relationship with single plant yield (Table 3 & Fig.…”

“…High heritability coupled with high GAM were observed for plant height, volume expansion ratio and single plant yield which indicates that these traits are controlled by additive gene action and have less environmental influence. Therefore, direct phenotypic selection will be effective in improving these traits and similar results have been reported by Nikhitha et al (2020) and Seneega et al (2019). High heritability and moderate genetic advance were found for the traits such as days to first flowering, panicle length, thousand grain weight and breadthwise elongation ratio.…”