Tammam,, A., EL-Sayed, E., Tawfelis, M. (2005). STUDIES OF CORRELATION AND PATH COEFFICIENT ANALYSIS FOR SOME YIELD ATTRIBUTES IN SOME BREAD WHEAT GENOTYPES UNDER TWO ENVIRONMENTS.. Journal of Plant Production, 30(2), 785-799. doi: 10.21608/jpp.2005.237128
A. M. Tammam,; E. A. M. EL-Sayed; M. B. Tawfelis. "STUDIES OF CORRELATION AND PATH COEFFICIENT ANALYSIS FOR SOME YIELD ATTRIBUTES IN SOME BREAD WHEAT GENOTYPES UNDER TWO ENVIRONMENTS.". Journal of Plant Production, 30, 2, 2005, 785-799. doi: 10.21608/jpp.2005.237128
Tammam,, A., EL-Sayed, E., Tawfelis, M. (2005). 'STUDIES OF CORRELATION AND PATH COEFFICIENT ANALYSIS FOR SOME YIELD ATTRIBUTES IN SOME BREAD WHEAT GENOTYPES UNDER TWO ENVIRONMENTS.', Journal of Plant Production, 30(2), pp. 785-799. doi: 10.21608/jpp.2005.237128
Tammam,, A., EL-Sayed, E., Tawfelis, M. STUDIES OF CORRELATION AND PATH COEFFICIENT ANALYSIS FOR SOME YIELD ATTRIBUTES IN SOME BREAD WHEAT GENOTYPES UNDER TWO ENVIRONMENTS.. Journal of Plant Production, 2005; 30(2): 785-799. doi: 10.21608/jpp.2005.237128
STUDIES OF CORRELATION AND PATH COEFFICIENT ANALYSIS FOR SOME YIELD ATTRIBUTES IN SOME BREAD WHEAT GENOTYPES UNDER TWO ENVIRONMENTS.
Wheat Research Program, Field Crops Research Institute, ARC, Egypt.
Abstract
This study was conducted at Res. farm of Shandaweel Agric. Res. station, Agric. Res. Cen. (ARC) Egypt. during the period of 2001/2002 —2003/2004 seasons, to estimates of phenotypic, genotypic correlations and path coefficient analysis in live bread wheat genotypes, F1 hybrids and three F2 populations under two treatments of irrigation (normal and drought stress). The results showed that grain yield/plant had positive and significant correlations with each of number of spikes / plant, 100 kernel weight, plant height and days to maturity under the two treatments of irrigation ¡n the parents and F, hybrids for both magnitudes of correlations. Meanwhile, in the F2 populations grain yield / plant showed varied values of corr&ations from positive and significant to insignificant in both phenotypic and genotypic correlations according to cross with previous traits. Similarly, phenotypic and genotypic corre’ations between grain yield f plant and each of number of kernels / spike and days to heading were negative in the parents only under normal irrigation, while the relationships of these traits was positive in the F1 hybrids under the two treatments of irrigation. Also, the resulls revealed that number of spikes / plant had positive and significant correlation with each of 100 kernel weight and days to maturity in the parents under the two irrigation treatments and positive insignificant correlations with each of plant height and days to heading in all studied genotypes under the wrigation treatments, while it showed negative and significant correlations with number of kernels f spike ¡n the parents and ¡n the F2 popu’ations of crosses No 2 (p x p) and No 3 (p x p5) . The phenotypic and genotypic correlations were positive and significant between number of kernels / spike and each cf kernel weight and number of days to heading in the parents under normal irrigation and ¡n the F1 hybrids with kernel weight and plant height. Meanwhile, in the F2 generations the relationships differed from positive to negative correlations according to population. Also, the relationships between 100 kernel weight and each of plant height, days to heading and days to maturity varied from positive to negative significant or insignificant according to genotypes and irrigation treatments. Plant height revealed positive correlations with days to heading in the parents and Fi hybrids under the two irrigation treatments and cross No 1 (P1 x P2) in the F2 generation under drought stress only. b Days to heading showed negative correlations with days to maturity in the parents and in the F1 hybrids under normal irrigation, while had positive and significant correlations under drought stress with all studied generations. Path coefficient analysis under normal irrigation showed that grain yield was directly affected by number of kernels I spike in all studied generations and number of spikes f plant in the (Fihybrids and cross No3 ¡n F2 population). Meanwhile, under drought stress , grain yield was affected directly by number of spikes I plant ¡n the parents and in the F2 population of cross No3, number of kernels / spike
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