ASSESSMENT OF GENETIC PARAMETERS AND TRAIT INTERRELATIONSHIPS IN EARLY MATURING SUGARCANE CLONES OVER THREE CROP CYCLES
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Authors
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D. ADILAKSHMI
Department of Genetics and Plant Breeding, Regional Agricultural Research Station, Anakapalle, Acharya N.G. Ranga Agricultural University, Andhra Pradesh-531001, India
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P.V. PADMAVATHI
Department of Genetics and Plant Breeding, Regional Agricultural Research Station, Anakapalle, Acharya N.G. Ranga Agricultural University, Andhra Pradesh-531001, India
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D. PURUSHOTAMA RAO
Keywords:
Genetic advance, Genetic correlation, Heritability, Path analysisAbstract
This study evaluated seven early maturing sugarcane clones across three crop cycles at the Regional Agricultural Research Station, Anakapalle, to estimate genetic variability, heritability, trait associations, and direct effects on key economic traits. The analysis of variance indicated significant effects of genotype, season and genotype × season interactions for all traits under this study, except for number of millable canes, cane girth and single cane weight. Among ten sugarcane clones across three crop cycles, clone 2018A 133 showed the best overall performance for cane yield, sugar yield and millable canes, while 2018A 65 excelled in juice quality traits. The ratoon crop consistently exhibited higher genotypic coefficients of variation, broad-sense heritability, and genetic advance, especially for cane yield, commercial cane yield and number ofmillable canes, signifying their selection potential in later stages. Brix, Sucrose and CCS% demonstrated moderate to low GCV values over crop cycles, suggesting limited genetic variability.Cane yield and CCS yield both exhibited high heritability across the three crop cycles. Traits likeBrix, CCS%, and Sucrose showed low to moderate heritability in the early crop cycles but exhibitedsubstantial increase in later crop cycles. Traits such as cane yield, CCS yield, and number of millable canes had both high heritability and high genetic advance as a percentage of mean inthe ratoon crop. In contrast, traits like single cane weight and cane girth showed inconsistent heritability and genetic advance across cycles, reflecting genetic instability. Juice quality traits (Brix, Sucrose, CCS%) showed increased heritability and genetic advance in the ratoon crop.Cane yield showed a strong positive correlation with CCS yield in all crop cycles. Juice quality traits such as Brix, Sucrose, and CCS% showed very strong positive correlations among themselves in all cycles. CCS yield exhibited significant positive correlations along with substantial direct effects in each season, highlighting their importance as key selection criteria in sugarcane
breeding programs
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