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1

Combining ability analysis of seven silk yield attributes in silkworm, Bombyx mori L.

100%
Bhargava S. K.
Journal of Applied Genetics
|
1995
|
vol. 36
|
issue 1
59-67
EN
The combining ability effects of five silkworm (Bombyx mori L.) stains and their 20F1's including reciprocals were analysed in a 5 x 5diallel cross for seven silk yield attributes, viz. effective rate of rearing (ERR), a measure of survival, cocoon yield, cocoon weight, shell weight,raw silk percentage, silk filament length/cocoon and silk reelability.Higher vaues of specific combining ablty (SCA) than the corresponding general combining ability (GCA) for all the attributes except E and cocoon yield are indicative of non-additive gene action.The parental strain JC2P was the best general combiner for all the attributes,except cocoon yield.The highest general combining ability effect for cocoon yield was shown by N4.The highest desirable or positive SCA effects resulted from N4xSH 2 (all the attributes except shell weght), JC2Px14M (all the attributes except cocoon weigh and shell weight), 14MxSH2 (all the attributes except ERR), N4xSPJ1 (all the attributes except shell weight and raw silk percentage).Only one reciprocal, namely SPJ1x N4, showed positive effects for all the atributes except silk reelability.The improvement of cocoon yield through mass selectiion followed by intermating and the use of the parental strain JC2P in future cross breeding are discussed.
2

Okra-leaf accessions of the upland cotton (Gossypium hirsutum L.): genetic variability in agronomic and fibre traits

100%
Rahman H., Bibi A., Latif M.
Journal of Applied Genetics
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2005
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vol. 46
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issue 2
149-155
EN
Okra-leaf types of the upland cotton have the potential to be competitive to the normal-leaf types in yield and fibre quality, in addition to its potential resistance to insect pests and drought. Okra-leaf cotton accessions, collected at Cotton Research Institute, Faisalabad, Pakistan, were evaluated in respect of genetic variance and relative performance in half- and full-sib crosses (combining ability) for 2 years. Variation due to parents ? years interaction was significant for lint percentage, seed weight and earliness index, resulting in moderately low but significant genetic variance across environments (years) for these traits. Interaction of environment with general combining ability was significant for seed yield, seed weight, and earliness index. General combining ability variation, contributed by females and males together, accounted for 71% of the total variation available for seed cotton yield, 60% of that for seed weight and height to node ratio each, and 75% of that for earliness index. Specific combining ability variation accounted for 85% and 51% of the total variation available for lint percentage and staple length, respectively. The contribution of female parents to general combining ability variation was higher than that of male parents for seed cotton yield, seed weight, height to node ratio, and earliness index. Okra-leaf accessions HR-VO-MS and HR107-NH were predicted to produce progenies having high yield, HR109-RT high lint percentage, while HR100-Okra, Gambo-Okra and HR-VO-1 were predicted to impart early crop maturity to their progenies by reason of their good general combining ability for these traits. The results also provided evidence that genes controlling high yield in HR-VO-MS and HR107-NH were different from those controlling high yield in HR109-RT. The set of genes controlling the high earliness index in HR100-Okra and that in HR-VO-MS also appeared to differ in expression.
3

Production and evaluation of doubled haploid wheat lines

100%
Pauk J., Kertesz Z.
|
|
vol. 38
|
issue 4
425-435
EN
F1, F2 populations as well as F3 and F4 wheat lines coming from more than 300 cross combinations have been used for androgenic wheat studies and more than 5000 haploid plants were produced. Promising doubled haploid lines were tested together with lines produced in the conventional way in yield trials. The two best doubled haploid lines overyielded the standard. On the basis of results related to the general combining ability it is advisible to cross parents with a good combining ability for characters such as high percentage of responding anthers and embryo/callus induction with parents indicating a good combining ability for green plant production. In this way ideal lines can be obtained for doubled haploid production.
4

The influence of nutrient shortage on the expression of combining ability effects for root characters in spring barley (Hordeum vulgare L.)

88%
Gorny A. G.
Journal of Applied Genetics
|
2000
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vol. 41
|
issue 2
63-73
EN
Effects of varied nutrition on the inheritance mode of the total and specific length of roots, root weight, shoot : root ratio and root uptake efficiency were studied in a diallel set of spring barley. Plants were grown in sand-vermiculite cultures under high and low NP nutrition. Results of the analysis of variance indicated that both the general (GCA) and specific (SCA) combining ability effects were important for the total length and dry matter of roots formed at the vegetative growth stage. Preponderance of non-additive gene action and overdominance were apparent only for root dry matter. The specific root length and root uptake efficiencies were controlled by additive gene action. Genotype ? nutrition interactions were significant for the root length measures and uptake efficiency indices. Although significant GCA ? nutrition interaction effects were observed for these root characters, the interactions contributed mostly to the magnitude of GCA effects but not to their sign. Except for root dry matter, the contribution of non-additive gene action to root variation enhanced under stress, heritabilities declined, while degrees of dominance of genes tended to increase. Nevertheless, the moderate narrow-sense heritabilities (18-62%) and the considerable proportion of additive variance found for the root characters under nutrient shortage suggest that an improvement of rooting ability under less favourable nutrition through conventional selection is a real objective for barley breeders.
5

Combining ability and heterosis effect in winter squash (Cucurbita maxima Duch.)

75%
Korzeniewska A., Niemirowicz-Szczytt K.
Genetica Polonica
|
1993
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vol. 34
|
issue 3
259-272
EN
Combining ability and heterosis effect of mine inbred lines of was estimated. As a result of incomplete diallel crosses 49 hybrids were obtained and then they were evaluated in two years of experiment. Both GCA and SCA were estimated. Heterosis effect was tested by comparison to the better parental form. was also estimated by comparison to the standard and by Pollhamer method. High GCA values were indicated for such traits as fruit weight and number, and yield. Significant SCA was observed for fruit yield. It confirms the contribution of the other than additive gene action. With respect to dry matter content and yield 144 line appeared to be the best parental form. Reciprocal crosses had an important effect on fruit vield and fruit weight. The highest heterosis effect was observed for dry matter yield and dry matter content.
6

Efficiency of nitrogen and phosphorus utilization in progenies of factorial crosses between European and exotic cultivars of spring barley (Hordeum vulgare L.)

63%
Gorny A. G., Ratajczak D.
Journal of Applied Genetics
|
2008
|
vol. 49
|
issue 4
349-355
EN
Previous observations suggested that some landraces, primitive cultivars and other barleys originating from the harsh conditions of the Middle East, North Africa and Tibet might serve as interesting sources of adaptation to low-input agriculture. This opportunity was verified in field experiments performed under reduced rates of nitrogen (N) and phosphorus (P) fertilization. Genetic variation in major components of the efficiency of N and P utilization was examined among F2 and F3 generations of crosses between four European female and seven exotic male lines of spring barley. Preponderance of general combining ability effects was found for most efficiency components, suggesting that the characters are mainly controlled by additive gene action. Non-additive effects appeared to be less or non-significant. Under reduced fertilization, hybrid progenies of the Syrian cv. M.Dingo/D.Alla 106 and the Moroccan cv. Moroc 9-75 exhibit an enhanced yielding and the highest capacity to utilize N and P efficiently in grain mass formation. The results proved that the exotic barleys appear to be particularly useful for breeding programs aiming at improved barley adaptation to less favourable fertilization regimes.
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