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COMBINING ABILITY ANALYSIS FOR YIELD AND QUALITY ATTRIBUTES IN SWEET POTATO [Ipomoea batatas (L.)Lam.]

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Title COMBINING ABILITY ANALYSIS FOR YIELD AND QUALITY ATTRIBUTES IN SWEET POTATO [Ipomoea batatas (L.)Lam.]
 
Creator Chaurasia, Phool Chandra
 
Contributor Dikshit, Dr. S.N.
 
Subject fungi, yields, hybrids, planting, heterosis, potatoes, biological phenomena, confectionery, sweet potatoes, genetics
 
Description The present investigation was conducted at Horticulture Research Farm, Department of Horticulture, under All India Coordinated Research Project on Tuber Crops, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.) India during Rabi, 2010-11 and 2011-12 to ascertain the magnitude of heterosis, to determine the extent of variability, heritability and genetic advance for various quantitative characters, to estimate the general combining ability and specific combining ability of parents and hybrids. The biological materials used in the study includes eight parents having five local genotypes of Chhattisgarh as lines viz., IGSP-12, IGSP-14, IGSP-C-15, IGSP-16, IGSP-18 and three testers (improved varieties) viz., Sree Rethna, Gauri, Indira Madhur and their resulting fifteen cross combinations and subsequent F1 generation.
Combining ability analysis was carried out following the Line x Tester analysis for vine length (cm), vine weight (g), tuber length(cm), tuber diameter(cm), neck length of tuber (cm), number of tubers per plant, tuber yield per plant (g), tuber yield (t/ha), marketable tuber yield per plant (g), marketable tuber yield (t/ha), weevil- infested tuber yield per plant (g), weevil- infested tuber yield (t/ha), Harvest index (%), fresh and dry weight of foliage (g), dry matter of tuber (%),total soluble solids (%) and carotene (mg/100g).
. This suggests the possibility of exploiting heterosis in the present material. Line IGSP-12/Gauri was found good general combiner for harvest index (%),IGSP-14/Sree Rethna for tuber diameter; IGSP-14/Gauri for weevil- infested tuber yield tonnes per ha; IGSP-14/Indira Madhur for fresh and dry weight of tuber; IGSP-C-15/Gauri for carotene mg/100g; IGSP-16/Gauri for tuber length and dry matter of tuber; IGSP-18/Sree Rethna for vine length and vine weight; IGSP-18/Gauri for neck length for tuber.
Line IGSP-C-15 was found best general combiner for tuber yield per plant (g) and tuber yield (t/ ha), harvest index and carotene mg/100g, IGSP-16 was found good general combiner for vine length, vine weight, neck length, number of tubers per plant and fresh and dry weight of foliage. On the basis of sca effects, the hybrid, IGSP-16/Indira Madhur was found superior for number of tubers per plant, tuber weight per plant, tuber yield (t/ha), marketable tuber yield per plant, marketable tuber yield (t/ha), weevil- infested tuber yield per plant and Total soluble solids.
The estimates of relative heterosis, heterobeltiosis and standard heterosis were also obtained for tuber yield and its components. A high degree of heterosis was observed for all the characters studied. High level of heterosis for tuber yield per plant was shown by the hybrids, IGSP-16/Indira Madhur followed by IGSP-C-15/Gauri, IGSP-14/Indira Madhur, IGSP-16/Sree Rethna and IGSP-12/Indira Madhur.
High genotypic and phenotypic coefficients of variation were observed for weevil- infested tuber yield per plant ,vine weight per plant , tuber diameter ,neck length of tuber, marketable tuber yield per plant , vine length tuber yield per plant , number of tubers per plant and carotene (mg/100g).
High genetic advance were observed for average weevil- infested tuber yield per plant, vine weight per plant , tuber diameter, neck length of tuber and marketable tuber per plant. Whereas, high heritability were observed for average vine length, tuber diameter, tuber yield per plant, marketable tuber yield per plant and vine weight per plant,
Therefore, direct selection for these characters will help in development of high-yielding varieties of sweet potato of different tuber shapes, flesh and colour of tuber by using local genotypes for Chhattisgarh state.
 
Date 2016-02-09T13:51:26Z
2016-02-09T13:51:26Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64247
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur