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20211
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Subject: Plant Breeding × Author: ROWSHAN, ABOZAR × End date: 2021 × Start date: 2020 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    RELATIVE EFFICIENCY OF IMPERATA CYLINDRICA- AND MAIZEMEDIATED CHROMOSOME ELIMINATION SYSTEMS FOR HAPLOID INDUCTION IN VARIOUS DERIVATIVES OF NEWLY SYNTHESIZED INDIGENOUS TRITICALES AND BREAD WHEAT GENOTYPES
    (Palampur, 2021-11-30) ROWSHAN, ABOZAR; Chaudhary, H. K.
    The research endeavour entitled “Relative efficiency of Imperata cylindrica- and maizemediated chromosome elimination systems for haploid induction in various derivatives of newly synthesized indigenous triticales and bread wheat genotypes” was executed in the Department of Genetics and Plant Breeding, CSK HPKV, Palampur during the years 2019-20 and 2020-21 with the goal to develop triticale × wheat F1 & BC1F1 to compare hybridization potential of diverse combinations and work out relative efficiency of haploid induction in triticale × wheat derivatives following Imperata cylindrica and maize- mediated chromosome elimination technique of doubled haploidy breeding. The material for present investigation comprised of 10 bread wheat genotypes HPW 155, HPW 249, HPW 349, HPW 368, HPW 440, VWFW 858, VWFW 896, Tyari 1, Saptdhara and DH 114; two newly synthesized triticale genotypes, Triticale 1 and Triticale 2 and their F1s & backcross derivatives. During rabi 2019-20, hybridization work was carried out using wheat genotypes as female parent and triticale genotypes as male parent followed by estimating the frequency of seed setting induced by the triticale genotypes in wheat parental lines. The first filial generation produced after hybridization was sown at HAREC, Kukumseri to deduce the frequency of seed setting for the formation of backcross generation. Triticale 1 performed better than Triticale 2 for development of F1s while Tyari 1 exhibited significantly higher response for hybridization with Triticale 1 and Triticale 2. The mean seed setting frequency recorded for the development of F1 generation was 22.73% & 15.84% with Triticale 1 and Triticale 2 respectively; while in BC1F1, it was 21.02% & 20.92% with Triticale 1 and Triticale 2 respectively. All the haploid induction parameters viz., pseudo seed formation, embryo formation and haploid regeneration, showed varied response in each generation of triticale x wheat derivatives exhibiting genotype specificity for haploid induction. On the basis of statistical analysis, it was revealed that relative efficiency of I. cylindrica was higher than maize for haploid induction in triticale x wheat derivatives. Derivatives of bread wheat genotypes with both the triticale genotypes preformed at par for haploid induction following I. cylindrica and Z. mays mediated- chromosome elimination technique. Backcross generation performed better than F1 and F2 genotypes towards haploid induction parameters. This attempt of hybridizing wheat with triticale; producing haploids from their F1, F2 and BC1F1, which can be transformed into double haploids following colchicine treatment has paved way to accelerate the wheat improvement programme with enhanced precision using the desirable genes from rye into wheat using triticale as bridging species.