scholarly journals Combining ability of the new CMS-lines of winter rapeseed (Brassica napus L.) bred at VNIIMK

2020 ◽  
Vol 4 (184) ◽  
pp. 18-23
Author(s):  
E.B. Bochraryova ◽  
◽  
Е.А. Strelnikov ◽  
L.А. Gorlova ◽  
V.V. Serdyuk ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Combining Ability ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Brassica Napus L ◽  
Winter Rapeseed

Combining ability (CA) of lines is one of the main criteria of estimation of the parental components of hybrids. There are existed the different crossing schemes for estimation of a combining ability. A method of top-cross is successfully used in a breeding practice. This method was used for estimation of a range of new CMS-lines of winter rapeseed perspective in breeding of simple interline hybrids. In our research we used six sterile lines on a base of CMS Ogura and six lines-restorers of fertility (testers). We obtained 36 test-hybrids for estimation of a combining ability of the lines. Positive combination of effects of the general combining ability (GCA) and variances of the specific combining ability (SCA), stable manifested in two years, we observed in two maternal lines 39712 and 40059. Hybrids with these lines had the higher average seed yield in two years of the research. These lines can be recommended for development of practically important hybrids of winter rapeseed. It is considered the testers possessing high GCA are promising for estimation of lines CA. in our research, two lines ORK 9 and ORK 21 demonstrated the high average seed yield of test-hybrids in two years of the research and can be recommended for usage as testers.

Heterosis and combining ability estimates in spring-planted oilseed rape (Brassica napus L.)

1985 ◽  
Vol 27 (4) ◽  
pp. 472-478 ◽  
Author(s):  
I. Grant ◽  
W. D. Beversdorf
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Combining Ability ◽  
Seed Weight ◽  
General Combining Ability ◽  
Brassica Napus L ◽  
Lodging Resistance ◽  
Percent Protein

A 6 × 6 diallel cross was conducted in spring-planted oilseed rape (Brassica napus L.) in 1983 at Elora and Dundalk, Ontario. The F1 hybrids exhibited positive heterosis for seed yield, of up to 72%, over the higher-yielding parent in the hybrid crosses. Heterosis for 1000 seed weight, percent oil, plant height, and lodging resistance was nonsignificant; negative heterosis for percent protein was observed with some hybrids. Generally, the hybrids were intermediate to the parents in flowering date and physiological maturity. Specific combining ability was more important than general combining ability for seed yield, percent oil, percent protein, plant height (Dundalk), and lodging resistance (Elora); specific combining ability was as important as general combining ability for 1000 seed weight, physiological maturity, plant height (Elora), and lodging resistance (Dundalk). The cultivars 'Topas' and 'Regent' were the best general combiners for seed yield. The best specific combinations for seed yield heterosis, 'Westar' × 'Hanna', 'Regent' × 'Liné', and 'Regent' × 'D-1', exhibited average high-parent heterosis values of 50, 38, and 30%, respectively. The results demonstrated that considerable potential exists for producing high-yielding single-cross hybrids of oilseed rape. Commercial exploitation of this heterosis will depend on the successful development of suitable pollination control mechanisms.Key words: Brassica napus, oilseed rape, F1 hybrid, heterosis, combining ability.

scholarly journals Biplot analysis of seed yield and oil content combining ability in rapeseed (Brassica napus L.)

2016 ◽  
Vol 10 (9) ◽  
pp. 1238-1243
Author(s):  
Gul Ghani ◽  
◽  
Raziuddin ◽  
Antonio Teixeira do Amaral Júnior ◽  
Ibni Amin Khalil ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Combining Ability ◽  
Oil Content ◽  
Brassica Napus L ◽  
Biplot Analysis

scholarly journals Genetic analysis of Plant Height, Yield Components and Seed Yield in Rapeseed (Brassica Napus L.) Cultivars

2014 ◽  
Vol 67 (1) ◽  
pp. 61-74
Author(s):  
Valiollah Rameeh
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Seed Yield ◽  
Combining Ability ◽  
Seed Weight ◽  
Main Axis ◽  
Brassica Napus L ◽  
Narrow Sense Heritability ◽  
Recessive Genes ◽  
Additive Genetic Effects

Abstract Half F2 diallel crosses of spring rapeseed (Brassica napus L.) varieties along with their parents were evaluated for plant height, first siliqua height, siliquae on main axis, siliquae per plant, 1000-seed weight and seed yield. The Analysis of variance based on Cockerham’s method revealed significant mean squares of general combining ability (GCA), specific combining ability (SCA) for all the traits indicating that both additive and non-additive genetic effects were involved in controlling these traits. Parent vs crosses mean square which is indicating average heterosis was significant for all the traits. In Hayman’s method the regression lines estimated for all the traits except plant height cut the Wr axis below the origin in the negative zone, suggesting the overdominance type of gene action for these traits except plant height. Based on the array points on the regression lines, 19H had maximum dominant genes for siliquae on main axis, siliquae per plant 1000-seed weight and seed yield, being closest to the origin, while 0ption500 possessed recessive genes for first siliqua height, siliquae per plant and 1000-seed weight, as evidenced by its distant position from the origin. Due to low narrow-sense heritability estimates for most of the traits, selection for improving these traits should be carried out in delayed segregating generations.

Combining ability analysis in mungbean [Vigna radiata(L.) Wilczek]

2017 ◽  
Author(s):  
Anamika Nath ◽  
S. R. Maloo ◽  
Baudh Bharti ◽  
R. B. Dubey ◽  
Rajani Verma
Keyword(s):  
Seed Yield ◽  
Combining Ability ◽  
Gene Action ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Mean Square ◽  
Additive Gene Action ◽  
Gene Effects ◽  
Combining Ability Analysis ◽  
Additive Gene

A diallel method was employed in which eight genotypically diverse lines of mungbean were crossed among themselves in all possible combinations excluding reciprocals. The mean square due to general combining ability (GCA) and specific combining ability (SCA) were significant for all the characters except mean square due to (SCA) for clusters per plant and seed yield per plant indicating importance of both additive as well as non-additive gene action. The estimates of variances due to specific combining ability were higher than general combining ability for all the traits except days to 50 % flowering, primary branches per plant, clusters per plant and seed yield per plant pointed out to be the preponderance of non-additive gene effects in the expression of these characters. Whereas predictability ratios were greater than the value of 0.5 for days to 50 % flowering, primary branches per plant, clusters per plant and seed yield per plant indicating the predominance of additive gene action for these characters. However, predictability ratio exhibited less than 0.5 values for rest of the characters indicating the predominance of non- additive gene action. The good general combiners for seed yield per plant were BM-4, PDM-139, ML-131, and IPM 99-125. The best specific cross combinations wereRMG-344 x RMG-1045, RMG-1035 x RMG-1045 and BM-4 x PDM-139. showed the highest positive significant SCA effect for seed yield per plant. These cross combinations could be utilized for further use in breeding programme for improvement in yield of mungbean.

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