Genetical studies on some intervarietal crosses of barley (Hordeum vulgare L.)
| dc.contributor.advisor | R. B. Prasad | |
| dc.contributor.author | Mahasweta Kar | |
| dc.date.accessioned | 2024-05-15T12:54:08Z | |
| dc.date.available | 2024-05-15T12:54:08Z | |
| dc.date.issued | 1986 | |
| dc.description.abstract | studies were undertaken to resolve the genetics of hull adherence, ear alignment, pericarp colour, glume colour and aun colour in the 7₁ and F2 generations of the crosses between seventeen varieties of barley (Hordeum vulgars L.). ten of which were hullless and seven hulled. Attempts were also made to detect linkage relationships, if any, between the genes controlling the various characters through joint segrega tion studies of the character pairs involved. The results have been critically discussed in the light of available literature. Hull adherence was found to be inherited on the basis of a single gene pair with the dominance of hulled condition in all the crosses studied. Probably the same dominant gene was present in all the hulled varieties. All the hullless varieties carried the recessive allele, except Karan 18 which seemed to carry the dominant allele for hulled condition along with an inhibitor which made it hullless. With this simple inheritance it should be easier for the breeder to incorporate this character in the commercial varieties to enhance their acceptibility by the farmers. Ear alignment was found to be complex in heritance. Three genes were found to control this character, two of which belonged to a complimentary system and are had an independent action.Pendant character was found to be dominant. From the consideration of results it is evident that the varieties Karan 264, L36 and Karan 16 had all the three dominant genes. the varieties P40, Pusa184 and Karan18 had the two dominant complimentary genes, Karan231 had the dominant allele of the independent action gene along with one dominant allele of the complimentary system, Ratna and Karan 4 had only one of the dominant genes of the complimentary system, while BR32, K125 and Jyoti had all the three recessive alleles. For pericarp colour the varieties Karan 4, P40, Karan16, L36, Jyoti, Karan18 and Karan16 were found two have tuo duplicate dominant genes with slight dosage effect, at least tuo dominant alleles being required to produce amber grain colour. The varieties Ratna, BR32, DR31, K125, Karan161, Pusa164, Pusa179 and Karan 231 carried the recessive alleles. Both the glume and aun pigmentation were found to be controlled by two dominant complimentary genes. However, their action was inhibited to cause a non-pigmented condition by a dominant gene which was found to be operative in all the crosses studied. There were indications coming out of joint segregation studies that there was a basic dominant gene for authocyanin pigmentation in glumes and awns that was able to express itself only in the presence of complimen tary dominant gene which was separate for glume and aun pigmentation. There was also present an inhibitor gene which could cut off the expression of the basic gene. It was not possible from the present studies to undertake varietyise allocation of these genes. studies of joint segregations of various character pairs indicated that the genes controlling hull adherence and ear alignment, hull adherence and am colour, pericarp colour and glume colour and pericarp colour and an colour assorted independently. Evidence of linkage was obtained in 4 out of 7 crosses for hull adherence and pericarp colour in 1 out of 4 crosses for hull adherence and glume colour, in 2 out of 2 crosses for ear alignment pericarp colour, in both the cross for ear alignment and glune colour, in one of out of one crosa for ear alignment and am colour and in two out of three crosses for glume colour and awn colour. It was considered unreliable to partition the total chi-square values and estimate cross over percentage because the population was much too small for 4 to 6 gene segregations. Furthermore, quite a few of the characters were controlled by interacting genes which made the task of definitely identifying the linked gene very difficult. However, there was evidence that in the cross Karan 264 x L 36 the gene for hull adherence was linked with the complimentary gene specific for glume colour and not to the basic gene responsible for pigment development in both glumes and awns. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810209022 | |
| dc.language.iso | English | |
| dc.pages | 76 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Genetics and Plant Breeding | |
| dc.theme | Genetical studies on some intervarietal crosses of barley (Hordeum vulgare L.) | |
| dc.these.type | M.Sc | |
| dc.title | Genetical studies on some intervarietal crosses of barley (Hordeum vulgare L.) | |
| dc.type | Thesis |