Correlation and Path Analysis in Advance Breeding Lines of Bread Wheat (Triticum aestivum L. em. Thall) for Terminal Heat Tolerance

Author: Lalit Kumar, Krishan Kumar, O.P. Bishnoi, Deepak Kumar, Naresh, Kavita and Rohit

Download PDF

Abstract

Forty bread wheat advance lines were accessed for correlation coefficients and path coefficient analysis, to identify the terminal heat tolerant genotypes. The present investigation was conducted at Wheat and Barley research area, Department of Genetics & Plant Breeding, CCS Haryana Agricultural University, Hisar during rabi 2019-20 in two sowing conditions (normal and late). Random block design (RBD) design was used with paired row and three replications. Seed yield showed positive and significant correlation with almost all the traits under both conditions except days to maturity, plant height, peduncle length in case of timely sown and days to maturity, grain per spike in case of late sown condition, whereas the results also reveal with path effects by positive direct effect with almost all the traits in both conditions except days to maturity, plant height in timely and only plant height in late sown conditions. Maximum indirect path was recorded for biological yield per plant and harvest index under both the environmental conditions. Based on the correlation coefficients and direct path effects analysis, traits like biological yield per plant, harvest index, 1000- grain weight, NDVI and SPAD value had a strong association with grain yield then other traits; implying sufficient amount of variability present among the genotypes for these traits and selection would be rewarded under heat stress conditions. On the basis of HSI, NW 7049, DBW 14, WH 1021, PBW 825, DBW 304, and PBW 797 lines were determined to be extremely terminal heat tolerant and can be utilized in future recombinant breeding programmes to develop terminal heat tolerant cultivars.

Keywords

Advance lines, wheat, NDVI, SPAD, HSI and correlation coefficients

Conclusion

In the present investigation, based on the study of character association and path analysis, the traits like biological yield per plant, harvest index, 1000-grain weight, NDVI, and SPAD value may be taken as selection criteria for both morpho-physiological parameters for screening of genotypes for heat tolerance due to their strong association and positive direct effect on grain yield under both the conditions; therefore, direct selection for these traits will be effective for yield improvement. On the basis of the heat susceptibility index (HSI) for all genotypes, the lines viz., WH1021, NW7049, DBW14, BRW 3806, PBW797, PBW 825, and DBW 304 were determined to be highly tolerant for terminal heat stress and may be significantly utilized in future crop improvement programmes.

References

-

How to cite this article

Lalit Kumar, Krishan Kumar, O.P. Bishnoi, Deepak Kumar, Naresh, Kavita and Rohit (2022). Correlation and Path Analysis in Advance Breeding Lines of Bread Wheat (Triticum aestivum L. em. Thall) for Terminal Heat Tolerance. Biological Forum – An International Journal, 14(4): 641-647.