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DIALLEL ANALYSIS FOR FRUIT YIELD AND NUTRITIONAL QUALITY IN TOMATO (Lycopersicon esculentum Mill.)

KrishiKosh

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Title DIALLEL ANALYSIS FOR FRUIT YIELD AND NUTRITIONAL QUALITY IN TOMATO (Lycopersicon esculentum Mill.)
 
Creator DAGADE SURESH BABAN
 
Contributor Barad A.V.
 
Subject Tomato
HORTICULTURE
 
Description The present investigation entitled “Diallel analysis for fruit yield and nutritional quality in tomato (Lycopersicon esculentum Mill.)” was undertaken to examine the magnitude of various heterosis estimates, inbreeding depression, combining ability and gene effects of eight diverse parents, their 28 F1s and 28 F2s for fruit yield and nutritional quality characters.
The experimental crossing work was done at Vegetable Research Station, Junagadh during September 2004 to February 2005. The F2 seed production was done at the Horticultural Instructional Farm, J.A.U., Junagadh during June to September 2005. The fruit and nutritional quality study was conducted at Biochemical Laboratory, Department of Agricultural Process Engineering, College of Agricultural Engineering and Technology, J. A. U., Junagadh and for yield and related character at Agricultural Experimentation Station, J. A. U., Junagadh during October 2005 to March 2006.
The analysis of variance revealed highly significant differences among parents, 28 F1s and 28 F2s for almost all traits
in the present study, indicating considerable amount of genetic variability present in the population studied.
The cross GT 1 x H 24 exhibited higher heterobeltiosis as well as standard heterosis along with considerable inbreeding depression followed by Pusa Ruby x H 24 and Pusa Ruby x Arka Vikas crosses indicating that these crosses could be suitable for exploitation of hybrid vigour on commercial scale. The cross, Pusa Ruby x Arka Vikas had stable performance in both generations. The crosses Pusa Ruby x Ec 398704, GT 1 x Ec 398704, Ec 163599 x Ec 177371, GT 1 x Ec 163599, GT 1 x Pusa Ruby, Ec 163599 x Ec 398704 and Ec 490190 x Arka Vikas exhibited comparatively high heterosis with low inbreeding depression hence, can be exploited for development of high yielding stable lines and or isolation of desirable segregants.
The estimates of analysis of variance due to general and specific combining ability indicated that both additive as well as non additive gene effects played an important role in the expression of almost all characters under present study. However, predictivity ratio showed that non additive gene action was predominant in the expression of number of primary branches plant-1, fruit yield plant-1, polar fruit diameter in both generations. The characters locules fruit-1 and ascorbic acid in F1 generation was found to be inherited by additive genetic variance and in F2 generation by non additive genetic variance. The advantage of existence of dominance observed for days to 50 per cent flowering, pericarp thickness, protein, vitamin C, β carotene and potassium content could be exploited through heterosis breeding.
The analysis regarding general combining ability revealed that parents GT 1, H 24 and Pusa Ruby were good general
combiners for maximum number of characters under present study. Whereas, parents Ec 490190, Ec 163599 and Ec 177371 were good general combiners for fruit and nutritional quality characters.
A close relationship existed between per se performance of crosses and sca effects, suggesting that it can be taken as criteria for effective heterosis. The sca effects manifested by GT 1 x H 24, Pusa Ruby x Arka Vikas, GT 1 x Ec 490190, Arka Vikas x Ec 163599, and H 24 x Arka Vikas crosses were considered important in self pollinated crop like tomato for heterosis breeding in future improvement programme.
A population with preponderance of additive gene action would support the improvement of a character through selection in segregating generations. While the presence and magnitude of various components of non additive gene effect can be justified with heterosis breeding.
 
Date 2016-09-08T15:53:28Z
2016-09-08T15:53:28Z
2006-08
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76144
 
Language en
 
Format application/pdf