INHERITANCE STUDIES OF YIELD, QUALITY TRAITS AND GYNOECIOUS SEX EXPRESSION IN CUCUMBER (Cucumis sativus L.) USING EXOTIC LINES
KrishiKosh
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Title |
INHERITANCE STUDIES OF YIELD, QUALITY TRAITS AND GYNOECIOUS SEX EXPRESSION IN CUCUMBER (Cucumis sativus L.) USING EXOTIC LINES
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Creator |
KALIDAS PATI
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Contributor |
A. D. Munshi
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Subject |
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Description |
T-8532
The present investigation entitled, “Inheritance studies of yield, quality traits and gynoecious sex expression in cucumber (Cucumis sativus L.) using exotic lines’’ was carried out at Indian Agricultural Research Institute, New Delhi during 2009-2011 with the major objectives to estimate the magnitude of heterosis, combining ability, gene action and generation mean analysis for yield and its related traits and heterosis and combining ability for nutritional traits and finally to study the inheritance pattern of gynoecious sex expression in cucumber. The material for the study consisted of 8 genetically diverse indigenous and exotic parental lines of cucumber and they were crossed in a diallel fashion (excluding reciprocals) to obtain 28 F1 hybrids. The parents P1 (GBS-1) and P5 (Pusa Uday) were observed to be the most promising for earliness and other desirable characters including total yield per plant. The gynoecious hybrids P1 x P5 (GBS-1 x Pusa Uday), P1 x P6 (GBS-1 x Punjab Naveen) showed best performance for yield per plant followed by monoecious hybrid P3 x P5 (GS-4 x Pusa Uday) as they manifested high heterosis percentage of 66.40 %, 54.44 % and 41.29 %, respectively over top parent P5 (Pusa Uday). Among parents, gynoecious line GBS-1(P1) showed maximum gca effects in desirable direction for node number of first female flower, days to first female flower anthesis, days to fruit set from opening of first female flower, days to first fruit harvest, number of fruits per plant, and vine length. In order of merit the gynoecious hybrids P1 x P5 (GBS-1 x Pusa Uday) and P1 x P6 (GBS-1 x Punjab Naveen) followed by monoecious hybrid P3 x P5 (GS-4 x Pusa Uday) exhibited highest sca effects for number of characters including total fruit yield per plant. The diallel analysis of genetic compent of variance revealed over-dominace gene action and low narrow sense heribability for majority of important yield contributing characters except days to first female flower anthesis, days to first fruit harvest, average fruit weight and vine length where partial dominace is more predominant. Among the eight parental lines, gynoecious parent P1 (GBS-1) was observed to be best performing for total soluble solids, vitamin C and potassium content. The hybrid P5 x P6 (Pusa Uday x Punjab Naveen) was found to superior over better, mid and top parent for potassium content, can be taken up for commercial cultivation. The mean square due to gca and sca were highly significant for all the characters studied which revealed that both additive and non-additive gene actions were important in the inheritance of nutritional traits. The F1 hybrids P3 x P5 (GS-4 x Pusa Uday) for total soluble solids, P3 x P8 (GS-4 x 7026B-76) for vitamin C, P1 x P8 (GBS-1 x 7026B-76) for calcium and P5 x P6 (Pusa Uday x Punjab Naveen) and P6 x P8 (Punjab Naveen x 7026B-76) for potassium content, exhibited highest sca effects may be exploited for development of nutritionally rich F1 hybrids. The study on gene effects based on generation mean analysis showed significance of dominance, additive and epistatic component in most of the crosses for different characters. The preponderance of non-additive and additive component of variance suggested the importance of heterosis breeding and recurrent selection for effective utilization of dominance and additive variance of variation. The segregation of gynoecism in F2 generation was observed to be in 3: 1 (gynoecious vs. monoecious) ratio which indicated gynoecious sex form in cucumber is controlled by single dominant gene. |
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Date |
2016-12-03T13:20:21Z
2016-12-03T13:20:21Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/88986
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Format |
application/pdf
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Publisher |
IARI, DIVISION OF VEGETABLE SCIENCE
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