Genetic variability, correlation and path coefficient studies in F2 generation of rice (Orzya sativa L.)

Abstract

Rice (Oryza sativa L.) is one of the staple cereal crops which feed more than half of the world population. Therefore, a better insight to the association of yield with its component traits can be helpful in improving the rice yield. The present study comprised of 371 F2 segregating progenies of the cross (Sahbhagidhan and BPT-5204 Sub-1), which were evaluated to assess the genetic variability, heritability and genetic advance, correlation and direct and indirect effects among yield and yield components. The correlation studies revealed that seed yield per plant was positively and significantly correlated with number of tillers per plant, number of panicles per plant, number of spikelets per plant, number of grains per plant, number of spikelets per panicle, number of grains per panicle, fertility percent and panicle length in F2 generation. The path analysis indicated that number of panicles per plant, number of spikelets per plant and number of grains per plant exhibited high and positive direct effects and thus, may be considered as useful traits for yield improvement of rice.

Genetic variability, frequency distribution and association analysis in ADT (R) 48 x Kavuni derived F2 population of rice (Oryza sativa L.)

“…Attributes namely, plant height, panicle length, spikelet fertility and hundred seed weight exhibited moderate range for both GCV along with PCV which were in agreement with reports of Kahani and Hittalmani (2015) for plant height and panicle length and Lingaiah (2018) reported akin for plant height and hundred seed weight. Low GCV and PCV were observed for grain length, grain breadth and low GCV accompanied with moderate PCV for length breadth ratio which agrees to outcomes witnessed by Sala et al (2015), Rani et al (2016), Seneega et al (2019) and Swapnil et al (2020) for grain length and grain breadth. All the characters under study had high heritability (Table 1).…”

“…3). Similar outcomes were found out by and Swapnil et al (2020) for panicle length and the number of filled grains per panicle and Abhilash et al (2018), Seneega et al (2019) and Bhargava et al (2021) for the number of productive tillers per plant. A significant and positive correlation of the number of tillers per plant was detected with panicle length, the number of grains per panicle, the number of filled grains per panicle, spikelet fertility, the number of productive tillers per plant similar to that of Swapnil et al (2020) for the number of productive tillers per plant.…”

“…Similar outcomes were found out by and Swapnil et al (2020) for panicle length and the number of filled grains per panicle and Abhilash et al (2018), Seneega et al (2019) and Bhargava et al (2021) for the number of productive tillers per plant. A significant and positive correlation of the number of tillers per plant was detected with panicle length, the number of grains per panicle, the number of filled grains per panicle, spikelet fertility, the number of productive tillers per plant similar to that of Swapnil et al (2020) for the number of productive tillers per plant. Significant and positive association of the number of productive tillers per plant was witnessed with spikelet fertility, the number of filled grains per panicle, the number of grains per panicle and panicle length which was in accordance with Ali et al (2018) for spikelet fertility, the number of filled grains per panicle and panicle length and Swapnil et al (2020) for panicle length and spikelet fertility.…”

“…The characters such as the number of filled grains per panicle, the number of tillers per plant, the number of productive tillers per plant also displayed significant and positive association with single plant yield suggesting that yield enhancement could be attained by direct selection of these traits. Traits such as grain length, the number of grains per panicle and spikelet fertility exhibited low negative direct impact on single plant yield which are in accordance with Hema et al (2019) conferring to grain length and Swapnil et al (2020) with regard to the number of grains per panicle. Though the traits, the number of grains per panicle and spikelet fertility exhibited low negative direct impact on single plant yield they conveyed a high positive indirect effect on single plant yield via the number of tillers per plant.…”

“…A significant and positive correlation of the number of tillers per plant was detected with panicle length, the number of grains per panicle, the number of filled grains per panicle, spikelet fertility, the number of productive tillers per plant similar to that of Swapnil et al (2020) for the number of productive tillers per plant. Significant and positive association of the number of productive tillers per plant was witnessed with spikelet fertility, the number of filled grains per panicle, the number of grains per panicle and panicle length which was in accordance with Ali et al (2018) for spikelet fertility, the number of filled grains per panicle and panicle length and Swapnil et al (2020) for panicle length and spikelet fertility. Similarly, a significant and positive association of the number of filled grains per panicle was detected with spikelet fertility and grain length with length breadth ratio and plant height with panicle length, the number of grains per panicle and hundred seed weight.…”