Variability and Correlation Study of Various Seed Vigour Parameters in Rice (Oryza sativa L.) under Elevated Temperature Condition

Author: Jyotirmayee Mishra, P. Sanghamitra, Devraj Lenka, Sharat Kumar Pradhan, Simanta Mohanty, Kailash Chandra Samal, Rajkumari Bhol, Iswar Chandra Mohanty, S.P. Monalisa and Subrat Kumar Mahapatra

Download PDF

Abstract

Seedling vigour is a crucial agronomic trait. High-vigour seeds are synonymous with high-quality seeds, yet in India, the availability of such quality seeds remains a challenge. Quality seeds with superior physiological performance, particularly in terms of seed vigour are vital for achieving higher yields, uniformity of seedling emergence, and greater resilience to adverse climatic conditions. In the present investigation, thirty rice landraces collected from different states of India were examined for eight seed vigour-contributing physiological traits under elevated temperature (ET) conditions viz., germination percentage, speed of germination, shoot length, root length, seedling length, seedling dry weight, seed vigour index I (SVI-I) and seed vigour index II (SVI-II). There was a significant reduction in mean values of various seed vigour-related physiological parameters studied under ET conditions in comparison to the control. Among the genotypes tested under ET conditions, Magura had the highest germination percentage of 75.67%, Karinellu had the highest seed vigour index I of 816.27 and, Adira-2 had the highest SVI-II of 2.902. The study revealed significant genotypic variability among the seedling vigour-related traits studied under ET condition, with the highest heritability observed for the shoot length (99.4%) followed by speed of germination (99.4%), root length (99.3%), seedling length (99.2%), seed vigour index II (98.3%), and seed vigour index I (98.1%). Out of the 30 genotypes, 3 genotypes recorded high seed vigour (SVI-I and SVI-II) values under ET conditions. Concerning every aspect of seed quality studied under ET conditions, a great deal of variation was seen among the genotypes. Among the two principal components (PCs) in principal component analysis, PC1 had an eigen value of 4.018, which accounted for 50.22% of the variation in the population. PC2 had an eigen value of 2.260, contributing 28.24% of the variation in the population. In addition, under ET condition, a significant positive correlation was recorded between seed vigour index I with shoot length (0.814), seedling length (0.791), speed of germination (0.745), seed vigour index II (0.574), seedling dry weight (0.457), and germination (0.422). Moreover, seed vigour index II was found to have a significant positive correlation with seedling dry weight (0.962), speed of germination (0.836), and seed vigour index I (0.574). The superior genotypes identified with high seed vigour under elevated temperature conditions could be used as suitable donor parents in future high-temperature tolerance breeding programs. Variability and correlation estimates revealed a better selection of target traits for improving seed vigour under high-temperature stress conditions

Keywords

Seed vigour index, Elevated temperature, Germination percentage, Speed of germination, Seedling length, Seedling dry weight, Variability, Correlation, Rice

Conclusion

The present study mainly examines the variability and correlation of various seed vigour-related physiological traits in thirty rice genotypes collected from diverse states of India, specifically under elevated temperature conditions. There was a significant reduction in mean values of various seed vigour-related physiological parameters studied under ET conditions compared to control. Among the genotypes tested under ET condition, Magura was identified with the highest germination percentage of 75.67%, Karinellu had the highest seed vigour index I of 816.27 while, Adira-2 had the highest SVI-II of 2.902. The study revealed significant genotypic variability among the seedling vigour related traits studied under ET condition, with the highest heritability observed for the shoot length (99.4%) followed by speed of germination (99.4%), root length (99.3%), seedling length (99.2%), seed vigour index II (98.3%), and seed vigour index I (98.1%). From the 30 genotypes, 3 genotypes recorded high seed vigour (SVI-I and SVI-II) under ET conditions. Concerning every aspect of seed quality studied under ET conditions, a great deal of variation was seen among the genotypes. Among the two principal components (PCs) in principal component analysis, PC1 had an eigen value of 4.018, which accounted for 50.23% of the variation in the population. PC2 had an eigen value of 2.260, contributing 28.24% of the variation in the population. In addition, under ET condition a significant positive correlation was recorded for seed vigour Index I with shoot length (0.814), seedling length (0.791), speed of germination (0.745), seed vigour index II (0.574), seedling dry weight (0.457), and germination (0.422). Moreover, seed vigour index II was found to have a significant positive correlation with seedling dry weight (0.962), speed of germination (0.836), and seed vigour index I (0.574)

References

-

How to cite this article

Jyotirmayee Mishra, P. Sanghamitra, Devraj Lenka, Sharat Kumar Pradhan, Simanta Mohanty, Kailash Chandra Samal, Rajkumari Bhol, Iswar Chandra Mohanty, S.P. Monalisa and Subrat Kumar Mahapatra (2022). Variability and Correlation Study of Various Seed Vigour Parameters in Rice (Oryza sativa L.) under Elevated Temperature Condition. Biological Forum – An International Journal, 14(5): 50-62.