Wyniki wyszukiwania - Biblioteka Nauki

1

A microsatellite marker based study of chromosomal regions and gene effects on yield and yield components in maize

100%

Mohammadi S. A. , Prasanna B. M. , Sudan C. , Singh N. N.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr 2A

EN

The genetic basis of different traits and the effect of chromosomal regions on the expression of such traits is the primary interest of this study. In the present investigation, the effect of chromosomal regions on yield and its two primary components was studied, and two genetic parameters, additive effect and degree of dominance, were estimated based on a single-locus model using markers with significant effects on the traits (informative markers). Eight inbred lines from diverse geographical regions of India were crossed in all possible pairs, and F1S were evaluated for the yield and yield components in a replicated trial in two environments. Sequential path analysis was employed to find those yield components showing significant direct effects on yield with negligible multicollinearity. The parental lines were profiled using 56 polymorphic SSR (Simple Sequence Repeat) markers covering 10 chromosomes of maize. Stepwise multiple regression analysis was used to determine the informative markers on yield and its primary components detected through path analysis. Fourteen markers were found to have association with chromosomal regions showing significant effects on the total grain yield, 100-grain weight and total number of kernels per ear. Chromosome 1 with four informative markers revealed the highest genic effects on yield and its components. Markers bnlg594 and bnlg1360 on chromosome 10, and bnlg147 on chromosome 1 revealed the highest additive effects on the total grain yield, 100-grain weight and total number of kernels per ear, respectively. For the analyzed traits, overdominance occurred in all the loci and d/a values, varying from 8.60 for 100-grain weight to 1.40 for total grain yield.

2

Practical application of daughter yield deviations in dairy cattle breeding

100%

Szyda J. , Ptak E. , Komisarek J. , Zarnecki A.

Journal of Applied Genetics

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2008

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tom 49

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nr 2

3

Epistatic gene effects on the yield of the parents of F1, F2, BC1 and BC2 progeny

84%

Zdravkovic J. , Zivoslav M. , Mirjana M. , Bogoljub Z. , Milan Z.

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tom 22

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nr 3

4

Interaction of ESR1 gene with the FSHB and MYOG genes: effect on the reproduction and growth in pigs

67%

Humpolicek P. , Tvrdon Z. , Urban T.

Animal Science Papers and Reports

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2009

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tom 27

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nr 2

105-113

EN

The study aimed at determining whether the combination of three selected genes can be used for selection in small populations of pigs. The estrogen receptor (ESR1), follicle stimulating hormone (FSHB) and porcine myogenin (MYOG) genes were selected to detect their combined effect. Although over the last decades considerable progress in pig production was achieved, reproduction in his species still remains unsatisfactory. The marker-assisted selection (MAS) is considered to bring progress in pig reproduction. If MAS is to be used efficiently, the complexity of reproduction process should be taken into consideration. The effects were studied of interaction between the mentioned three genes and selected production and reproduction traits of pigs. Interactions between the effects of particular gene markers are important because of possible negative effect(s) of a single-path selection as well as possible co-selection. No significant interaction between the effects of genes studied was found. It is concluded that in small populations co-selection is effective only when highly significant effects of selected auxiliary genes occur.

PL

Aczkolwiek na przestrzeni ostatnich lat zarysował się znaczny postęp w produkcji trzody chlewnej,to jednak tempo reprodukcji tego gatunku należy uznać za niewystarczające. Badania zmierzały do twierdzenia, czy kombinacja wybranych genów może znaleźć zastosowanie w selekcji małych populacji trzody chlewnej. Opierając się na wynikach prac wcześniejszych, których wyniki świadczyły o istnieniu zależności między konkretnymi genami a cechami produkcji i reprodukcji świń, do badań wybrano geny ESR1, FSHB i MYOG. W przypadku selekcji wspomaganej markerami (marker-assisted selection) interakcje między efektami konkretnych genów mogą być ważne i przydatne wobec zagrożenia uzyskaniem ujemnego wyniku w przypadku pojedynczej ścieżki selekcyjnej lub koselekcji. Poza dwoma mało przekonującymi przypadkami nie stwierdzono istotności poszukiwanych interakcji. Autorzy wnioskują,że w małych populacjach koselekcja może być skuteczna wyłącznie wtedy, gdy efekt wybranych genów „wspomagających” jest wysoce istotny.

5

Variation in morpho-physiological characters in forage rape [Brassica napus L.]. 2. Stomatal characters

67%

Paul N. K.

Genetica Polonica

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1992

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tom 33

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nr 1

6

The combining ability in some varieties and strains of winter triticale [x Triticosecale Witt.]

67%

Wegrzyn S. , Grzesik H.

Plant Breeding and Seed Science

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1996

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tom 40

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nr 3-4

7

The value of pig breeding herds in Germany and progress in improvement of meatiness and pork quality

59%

Rosner F. , Von Lengerken G. , Maak S.

Animal Science Papers and Reports. Supplement

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2003

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tom 21

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nr 1