Wyniki wyszukiwania - Biblioteka Nauki

1

Regeneration ability of different explants derived from mutagenically treated Arabidopsis thaliana [L.] Heynh. plants

100%

Nabialkowska D. , Szarejko I. , Maluszynski M.

|

tom 50

433-436

2

DNA methylation dynamics under drought stress in barley

100%

Chwialkowska K. , Szarejko I. , Kwasniewski M.

|

nr 3

3

Tagging mutated genes for Al tolerance in barley. I. Selection for Al plus 3 tolerant mutants

100%

Nawrot M. , Maluszynski M. , Szarejko I.

|

tom 34

4

Cytological and genetic evaluation of anther culture-derived doubled haploids in barley

100%

Szarejko I. , Falk D. E. , Janusz A. , Nabialkowska D.

|

nr 4

EN

Gametoclonal variation among anther culture-derived plants of three barley genotypes was estimated on the basis of cytological analysis (DH1, DH2 generation), observation of morphological variants (DH2, DH3) and chlorophyll mutation test (DH2, DH3). Individual head rows were grown in the field to detect possible chimeric structure of regenerants and to assess the number of variants and mutations in each line. Spontaneously doubled plants were the most frequent class (70%) among regenerants and almost 90% of them were completely fertile. There was a difference in proportion of haploids produced by different genotypes, but the highest frequency observed did not exceed 21%. The remaining regenerants were tetraploid, and contained chromosomal mutations or chimeras. In total, there were about 15% of polyploids and plants carrying chromosomal aberrations (translocations, inversions) among DH1 individuals. The changes in chromosome number and structure were the main source of observed variation. The level of gene mutation induced in vitro was relatively low. No more than 1% of microspore-derived plants expressed visible morphological changes in DH2 progeny. Only two morphological variants derived from the Bruce cultivar proved to be homozygous mutants (dwarf type) stable up the to third generation. The frequency of DH plants carrying chlorophyll mutation was 5.8%, but most of them (82%) were chimeric and had only a small mutation sector. The level of gametoclonal variation depended on the donor plant genotype. The highest proportion of variants and mutations was observed among DH plants derived from the Bruce cultivar, while the lowest was recorded among plants regenerated from anther culture of the doubled haploid line H930-36. Mechanisms leading to the observed variation and implications resulting from the presented experiments concerning implementation of anther culture in barley breeding were discussed. It was concluded that this method resulted in a high frequency of spontaneous doubling, a low frequency of genetic changes, and being less time and effort-consuming than the ’Bulbosum’ technique, can be applied to most barley breeding programs.

5

Gene segregation in a barley DH population

100%

Szarejko I. , Maluszynski M. , Polok K. , Zbieszczyk J.

|

nr 4

EN

A large population of anther culture-derived barley regenerants and their progeny was tested for allele segregation at 1 isozyme and 8 morphological marker loci. The segregation of genetic markers was examined separately for haploid, diploid and polyploid regenerants. All the 9 analysed genes except al (albino lemma) on chromosome 3 segregated according to the expected 1:1 ratio in the microspore-derived barley population. There was no difference in allele distribution between haploid and diploid regenerants. Among the limited number of 34 analysed tetraploids a significant excess of the dominant allele at locus о (orange lemma) of chromosome 6 was also observed. The recombination frequency between linked genes (n - lk2 on chromosome 1 and r - s on chromosome 7) estimated in the DH population did not differ significantly from recombination rates calculated in F₂ progeny or presented in barley chromosome maps. The phenomenon of gametic selection is discussed in relation to the genotype dependency of anther culture response and procedures used for DH production in barley.

6

The use of translocations for localization of semidwarf and isozyme mutants in barley

100%

Szarejko I. , Kucharska M. , Maluszynski M. , Nawrot M.

|

tom 1696

7

Identification of single-base deletion in mutated barley gene BRI1 encoding brassinosteroid receptor

88%

Gruszka D. , Zbieszczyk J. , Jochymek M. , Kwasniewski M. , Szarejko I.

|

nr 2 Spec.Vol.

8

QTLs for earliness and yield-forming traits in the Lubuski x CamB barley RIL population under various water regimes

51%

Ogrodowicz P. , Adamski T. , Mikolajczak K. , Kuczynska A. , Surma M. , Krajewski P. , Sawikowska A. , Gorny A. G. , Gudys K. , Szarejko I. , Guzy-Wrobelska J. , Krystkowiak K.

|

nr 1