Abstract
Generation mean analysis in cucumber (Cucumis sativus L.) was carried out during 2006–07 to study gene effects for fruit yield and its components in interacting and non-interacting crosses using 3-parameter model and 6-parameter model, respectively. For this purpose, six promising parents selected out of 17 genotypes were crossed in a half-diallel fashion to generate 15 F1s. Top five high-yielding F1s were advanced to F2s, B1s and B2s. The estimates of gene effects obtained through analysis of six generations revealed preponderance of both additive and dominance effects for fruit weight, fruit length and fruit diameter. Epistatic interactions were observed for earliness, number of fruits/plant and yield/plant. However, scaling test was non-significant for fruit weight and length in all the five crosses showing absence of epistasis in the control of these characters. Some crosses showed duplicate type of interaction while others showed complementary epistasis. For instance, for fruit yield/ plant, CRC 8 × Pusa Uday and CHC 2 × DC 1 showed complementary epistasis, which would increase the heterosis in positive direction. The magnitude and direction of the gene effects varied from cross to cross. Thus, characters such as fruit weight and fruit length which are governed by entirely additive components could be improved through individual selection while for days to first female flower opening, days to first fruit harvest, number of fruits/plant and fruit yield/plant showing predominant dominance gene effects and interaction effects, biparental mating and recurrent selection would exploit both additive and non-additive type of gene effects efficiently.
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Claims 10
Claim · model-written summary
Both additive and dominance effects predominated for cucumber fruit weight, length and diameter.
- Taxon
- cucumber
Cucumis sativuse0 - Outcome
- fruit weight, fruit length and fruit diametere1
- Qualifier
- additive and dominance effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“preponderance of both additive and dominance effects for fruit weight, fruit length and fruit diameter”
Claim · model-written summary
Epistatic interactions were observed for cucumber earliness, fruit number and yield per plant.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- epistatic interactionse1
- Qualifier
- earliness, number of fruits/plant and yield/plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“Epistatic interactions were observed for earliness, number of fruits/plant and yield/plant”
Claim · model-written summary
Scaling tests were non-significant for fruit weight and length in all five crosses, supporting absence of epistasis for those traits.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- absence of epistasise1
- Qualifier
- fruit weight and length in all the five crossese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“scaling test was non-significant for fruit weight and length in all the five crosses showing absence of epistasis in the control of these characters”
Claim · model-written summary
Some cucumber crosses showed duplicate interaction.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- duplicate type of interactione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“Some crosses showed duplicate type of interaction”
Claim · model-written summary
Other cucumber crosses showed complementary epistasis.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- complementary epistasise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“others showed complementary epistasis”
Claim · model-written summary
The CRC 8 × Pusa Uday cross showed complementary epistasis for fruit yield per plant that would increase heterosis.
- Taxon
- cucumberCucumis sativuse0
- Material
- CRC 8 × Pusa Udaye1
- Outcome
- complementary epistasise1
- Qualifier
- fruit yield/ plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“for fruit yield/ plant, CRC 8 × Pusa Uday and CHC 2 × DC 1 showed complementary epistasis, which would increase the heterosis in positive direction”
Claim · model-written summary
The CHC 2 × DC 1 cross showed complementary epistasis for fruit yield per plant that would increase heterosis.
- Taxon
- cucumberCucumis sativuse0
- Material
- CHC 2 × DC 1e1
- Outcome
- complementary epistasise1
- Qualifier
- fruit yield/ plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“for fruit yield/ plant, CRC 8 × Pusa Uday and CHC 2 × DC 1 showed complementary epistasis, which would increase the heterosis in positive direction”
Claim · model-written summary
The magnitude and direction of cucumber gene effects varied among crosses.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- gene effects varied from cross to crosse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“The magnitude and direction of the gene effects varied from cross to cross”
Claim · model-written summary
Individual selection was recommended for cucumber fruit weight and length.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- individual selectione1
- Qualifier
- fruit weight and fruit lengthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“fruit weight and fruit length which are governed by entirely additive components could be improved through individual selection”
Claim · model-written summary
Biparental mating and recurrent selection were recommended for cucumber flowering, harvest timing, fruit number and yield traits.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- biparental mating and recurrent selectione1
- Qualifier
- days to first female flower opening, days to first fruit harvest, number of fruits/plant and fruit yield/plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber (Cucumis sativus L.)”
e1“for days to first female flower opening, days to first fruit harvest, number of fruits/plant and fruit yield/plant showing predominant dominance gene effects and interaction effects, biparental mating and recurrent selection would exploit both additive and non-additive type of gene effects efficiently”