“SELECTION OF IDEAL GENOTYPES FROM OPEN POLLINATED SEEDLING POPULATION OF SWEET POTATO [Ipomoea batatas (L.) Lam.]”
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Date
2004
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Indira Gandhi Krishi Vishwavidyalaya Raipur
Abstract
The present investigation entitled “Selection of ideal genotypes from open pollinated seedling population of sweet potato (Ipomoea batatas (L.) Lam.)” was carried out at Horticultural Experimental Farm, Indira Gandhi Agricultural University, Raipur (C.G.). The experimental material consisted of thirty four sweet potato genotypes which were replicated thrice in a randomized block design during Rabi 2003-04. The data on vine length, vine weight per plant, total tuber yield per plant, harvest index, biological yield per plant, total tuber yield tonne per hectare, marketable tuber yield per plant, marketable tuber yield tonne per hectare, number of tuber per plant, total soluble solid, tuber length, neck length and diameter of tuber, weevil infested tuber yield per plant, dry weight of tuber and dry weight of vine were recorded and analysed to workout the genetic variability, heritability, genetic advance, correlation and path coefficient analysis for all the characters. Analysis of variance revealed that the mean sum of squares due to genotypes were significant for all the characters except number of tubers, diameter of tuber, total soluble solids, marketable tuber yield tonne per hectare and neck length of tuber. The genotypic coefficient of variation was found highest for the marketable tuber yield per plant followed by tuber yield gm per plant, vine weight per plant, biological yield per plant, vine length, neck length of tuber and total soluble solid. Whereas, phenotypic coefficient of variance was found highest for marketable tuber yield per plant followed by vine weight per plant, tuber yield per plant, number tuber plant, vine length, biological yield per plant, total soluble solid, neck length of tuber and harvest index.
Heritability estimates in general were high for most of the traits. High heritability coupled with high genetic advance as per cent of mean was high for tuber yield per plant followed by vine weight per plant, marketable tuber yield per plant, biological yield per plant, neck length of tuber, total soluble solid and vine length indicated the preponderance of additive genetic variance and direct selection of these character is very effective. Correlation coefficient analysis revealed that tuber yield gm per plant had positive correlation with biological yield per plant, harvest index, marketable tuber yield per plant and diameter of tuber, suggesting selection for component characters may increase the tuber yield of sweet potato. Path coefficient analysis revealed biological yield per plant and harvest index were important traits influencing tuber yield and could be utilized as selection criteria in sweet potato improvement programme for Chhattisgarh plains. On the basis of organoleptic taste three genotypes viz., IGSP-12-2-5 (C10), IGSP-4-02-2 (C28) and POL-21-2-8 (C30) were identified excellent and fourteen genotypes showed very good performance whereas, one genotype was found unacceptable. They entry 56-2-02-7 was produced deep orange fleshed tuber and can be considered as carotene rich genotype On the basis of higher total tuber yield (gm/plant), the genotypes IGSP02-20 (C20) and 56-2-02-2 (C29) performed better for early bulking, IGSP-02-26 (C26) for medium bulking and IGSP-02-27 (C27) for late bulking were identified as ideal genotypes for Chhattisgarh plain.
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114 p.