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1

Plant height and yield components of inbred isogenic and F1 hybrid Rht dwarf wheats

100%
Flintham J. E., Gale M. D.
Journal of Applied Genetics
|
1998
|
vol. 39
|
issue 1
73-83
EN
Single and double-gene Rht1, Rht2, Rht3, Rht1 + Rht2 and Rht3 + Rht2 isogenic lines of wheat in four parental rht varieties were grown in drilled yield trials at four sites in 1989. The same lines were also grown in 1988 together with hybrid genotypes from CHA (chemical hybridising agent) F1 production plots. In the inbred lines shorter than one metre, Rht alleles reduced total shoot biomass by shortening the straw; mass of straw per unit plant height was unaffected. Highest grain yield was obtained from plant heights between 70 and 100 cm. The Rht genotype achieving this stature varied according to parent varietal height. The hybrids grown allowed comparisons between intra- and inter-varietal crosses over a range of Rht genotypes. In F1 hybrids positive heterosis was observed for plant height, grain yield and mean grain weight. Highest yields were obtained from inter-varietal hybrids carrying one, two or three doses of Rht1 or Rht2 or one dose of Rht3. An Rht3/rht hybrid showed resistance to premature ?-amylase production during grain ripening.
2

An evaluation of some morphological traits in doubled haploid lines and their F1 hybrids of head cabbage Kamienna Glowa in the vegetative phase

80%
Kaminski P.
Journal of Applied Genetics
|
2000
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vol. 41
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issue 4
247-252
EN
The internal stump length, head mass and head shape of doubled haploid (DH) lines and their F1 hybrids of head cabbage Kamienna Glowa were compared. It was found that the range of variation in the investigated traits of DH lines was higher than that of their F1 hybrids. The head mass of the DH lines indicated some level of inbreeding depression, but their F1 hybrids showed a significant effect of heterosis. Genes responsible for flattened head shape were dominant over rounded shape genes. The longer internal stump trait was dominant over the shorter one.
3

Assessing genetic variation to predict the breeding value of winter triticale cultivars and lines

80%
Goral H., Tyrka M., Spiss L.
Journal of Applied Genetics
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2005
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vol. 46
|
issue 2
125-131
EN
The objective of this study was to evaluate the usefulness of amplified fragment length polymorphism (AFLP) analyses for selection of the best parents for breeding of hybrid winter triticale. Phenotypic diversity was measured for 8 agronomic traits in 10 parents and 27 F1 hybrids. Genotypic diversity was measured by 91 AFLP markers. Coefficients of correlation of genetic similarity (AFLP-GS) with both Euclidean distances and mean values of the traits were generally not significant. A correction of the preliminary binary matrix into trait-specific derived matrices increased the values of 5 correlation coefficients to a significant level. The correlation of AFLP-GS with mid-parent heterosis of grain weight per plant was low but significant (r = ?0.452). Our study confirms the effectiveness of marker preselection for obtaining AFLP-GS better correlated with heterosis. The use of derived matrices is promising for reducing the number of cross combinations tested for specific combining ability.
4

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

61%
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.
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