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Phenotypic and genotypic correlations and path coefficient analysis in sugarcane at first clonal selection stage.
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Abstract: This investigation was conducted at Shandweel Agricultural Research Station, Sohag Governorate, Egypt, during 2012 - 2013 and 2013 - 2014 seasons to determine phenotypic and genotypic correlation coefficients among ten agronomic characters in sugarcane (Saccharum spp.) and to analyze their interrelationships through path coefficient analysis. Thirty sugarcane clones that were selected from six bi - parental crosses (families) along with two check cultivars (GT54 - 9 and Ph8013) were laid out in a randomized complete block design with three replications at the first clonal selection stage.
The results showed that phenotypic and genotypic correlation between cane yield and its components, viz. stalk diameter, stalk weight and number stalks/fed were highly significant in the positive direction in plant cane, first ratoon and across crops. There
was also a positive and significant correlation of cane yield with Brix% and sugar yield,
however, insignificant correlation was observed with stalk height at phenotypic and
genotypic level in both plant cane and first ratoon crops.
On the other hand, sugar yield recorded a positive and highly significant phenotypic and genotypic correlation with each
of stalk diameter, stalk weight, number stalks/fed, cane yield, Brix%, sucrose percentage and
sugar recovery % , while this trait gave a negative and insignificant correlation with
stalk height in both plant cane and across crops.
The path coefficient analysis revealed that stalk weight surpassed stalk number in their phenotypic and genotypic direct effects on cane yield in plant cane, first ratoon and across crops. Stalk diameter had a large
positive direct effect on stalk weight followed by stalk length
at phenotypic and genotypic level in both crops. Brix had a negative phenotypic and genotypic direct effect on sugar
recovery, while, sucrose had a large positive phenotypic and genotypic direct effect on
sugar recovery in both plant cane and first ratoon. The path analyses further showed that cane yield and sugar recovery% were the most important components that had phenotypic and genotypic direct effects on sugar yield. Both correlation and path coefficient analyses can
provide some guide to breeders for selecting best clones and predicating selection gain.
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| Publication year |
2015
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| Pages |
297-321
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| Organization Name |
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| City |
القاهرة
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| Author(s) from ARC |
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| Publication Type |
Journal
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