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COMBINING ABILITY AND HETEROSIS IN RIDGE GOURD (Luffa acutangula (Roxb.) L.

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Title COMBINING ABILITY AND HETEROSIS IN RIDGE GOURD (Luffa acutangula (Roxb.) L.
 
Creator AMEER AHMED, M
 
Contributor PRABHAKAR REDDY, I
 
Subject COMBINING, ABILITY, HETEROSIS, RIDGE, GOURD
 
Description To assess the magnitude of heterosis, combining ability, and nature of
gene action in ridge gourd a field experiment was carried out during spring
summer 2000 at the Student’s Farm, College of Agriculture, Rajendranagar. The
plant material includes 18 single crosses developed by crossing 6 lines viz., LA-
43, LA-106, LA-16, LA-44, LA-107 and LA-9 and 3 testers viz., LA-12, LA-17
and LA-97 in Line x Tester mating design. These crosses along with their 9
parents, and a standard check NS-3 were evaluated in a randomized block design
with three replications. Data was recorded on thirteen yield and yield contributing
characters.
The analysis of variance revealed the presence of significant differences
among the genotypes, parents and crosses for all the traits studied. Hybrids
generally gave higher yield compared to their parents. The per se performance of
crosses was better for number of laterals per vine, days to first and last picking,
length of the vine and fruit yield per vine.
Most of the crosses exhibited positive and significant heterosis for number
of fruits per vine, fruit length, fruit weight, days to last picking, number of laterals
per vine and finally the fruit yield per vine over mid parent and better parent. Of
the 18 crosses, only crosses of LA-44, namely LA-44 x LA-17 and LA-44 x
LA-12 showed positive and significant standard heterosis for fruit yield per vine.
These crosses can be further evaluated in yield trails for their consistency in yield
performance. The estimates of σ2gca and σ2sca indicated the importance of non additive
gene action for all the traits studied, indicating the importance of heterosis
breeding in ridge gourd. The line LA-44, exhibited positive and significant gca
effects for the yield and three important yield contributing traits viz., number of
fruits per vine, fruit length, length of the vine and fruit yield per vine. The same
line exhibited negative but desirable gca effects for node of first male and female
flower, days to male and female flower appearance and days to first picking.
Hence, LA-44 is identified as a good general combiner, with good potential in
hybrid breeding programmes for yield improvement.
Out of the 18 crosses, LA-44 x LA-17 exhibited positive and significant
sca effects for number of fruits per vine, fruit length, fruit weight, days to last
picking and fruit yield per vine. The same cross recorded negative and significant
sca effects on, node of first male flower, node of first female flowers and days to
male and female flower appearances which is in the desired direction. Hence this,
cross is identified to be the best specific cross.
High heritability coupled with high GCV was observed for the traits viz..,
yield per vine, number of fruits per vine, fruit length, fruit girth, fruit weight, vine
length and node of first female flower.
The present study revealed that the yield of fruits was positively and
significantly associated with number of fruits per vine, fruit length, fruit weight,
days to last picking, number of laterals per vine and length of the vine. Also the
number of fruits per vine had recorded the largest positive direct effect on the
fruit yield per vine followed by fruit weight. The overall perusal of the results revealed the predominant role of nonadditive
gene action, which is important in the fruit yield and its contributing
characters. Therefore, heterosis breeding will be useful in exploiting the hybrid
vigour for yield. Further these cross combinations can be utilized in recurrent
selections to exploit non-additive gene action.
 
Date 2016-08-20T13:54:25Z
2016-08-20T13:54:25Z
2003
 
Type Thesis
 
Identifier ACHARYA N.G. AGRICULTURAL UNIVERSITY RAJENDRA NAGAR, HYDERABAD - 500 03 0
http://krishikosh.egranth.ac.in/handle/1/73169
 
Language en
 
Format application/pdf