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environmental effects on correlation and path coefficient estimates for three groups of agronomic traits affecting grain yield of sorghum
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Abstract: To examine the influence of environment on the interrelationships between agronomic traits of grain sorghum affecting grain yield, 30 restorer and 20 maintainer lines were compared under two water regimes (normal irrigation and post-flowering stress) in two locations during the growing seasons of 2003 and 2004. The combined analysis for agronomic traits and yield components showed significant differences among the genotypes, locations, years and water regimes.
Correlation between studied traits generally displayed the same trend in the six environments. However, significant differences between water regimes for estimates that associations between number of green leaves and kernels/head, panicle length, plant height and grain yield/plant. Similarly, estimates of correlation coefficients were significantly different between locations for days to 50% heading and plant height, panicle width, grain yield/plant and kernel number/head and for the correlation between plant height with panicle length, and leaf area and number of green leaves. No significant differences were observed between correlation estimates due to year effects
Path coefficient analysis indicated the major role of the direct effects of kernels/head among the yield component traits. Panicle traits showed slight direct and indirect effects on grain yield with panicle width having the greatest direct effect. Morphological traits did not display any important direct effects on grain yield. Yield component traits accounted for 0.976 of the grain yield variation, and appeared to be most suitable for indirect selection for yield. Water stress increased the unknown factors affecting grain yield from 0.024 under normal moisture to 0.205 under water stress
Key words: Grain sorghum, Correlation, Path coefficient, Determination coefficient, Water stress, Yield components.
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| Publication year |
2006
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| Pages |
31-45
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| Availability location |
معهد بحوث المحاصيل الحقلية 9- شارع الجامعة- الجيزة
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| serial title |
المجلة المصرية لتربية النبات:
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| Author(s) from ARC |
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| Agris Categories |
Agriculture - General aspects
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AGROVOC
TERMS |
Sorghum.
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| Publication Type |
Journal
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