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Researcher Chandra, Subhash
Advisor Singh, Sumer Pal
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher DIVISION OF GENETICS INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Agriculture & related technologies ♦ Techniques, equipment & materials
Subject Keyword Inheritance of Fertility Restoration In A1 Based Cgms and Genetic Diversity Analysis of Maintainers and Restorers In Pearl Millet [pennisetum Glaucum (l.) R. Br.] ♦ Genetics and Plant Breeding
Abstract Inheritance of fertility restoration of the A1 system of cytoplasmic-nuclear male sterility in pearl millet was investigated using six crosses developed by crossing two diverse male sterile lines (A-lines) with three diverse restorers (R-lines). The F1 plants of all the six crosses were selfed to produce F2 seed and simultaneously crossed to their corresponding A lines to produce BC1F1 seeds in summer 2013 at ICRISAT, Hyderabad. The parents, F1, F2 and BC1F1 populations were planted in 2013 rainy season at Delhi and in summer season 2014 at Delhi and Dharwad. Crosses 576A/IPC 1518, 411A/IPC 1518, 576A/ICMR 06111 and 411A/ICMR 06111 showed a segregation ratio of fertile: semifertile: sterile as 9:3:4 and 1:1:2 in F2 and BC1 generations, respectively, for pollen fertility, indicating involvement of the digenic supplementary or an epistasis with recessive gene action for these crosses. In the other two crosses, where a different restorer HTP 94/54 was crossed with the same CMS lines 576A and 411A as earlier, different digenic ratios of fertile: sterile of 9:7 and 1:3 in F2 and BC1 generations, respectively, were obtained for pollen fertility, indicating involvement of two genes interacting in complementary manner. Data of summer season Delhi 2014 did not fit in any ratio. It is suggested that high temperatures and low humidity during the summer season affected the pollen fertility thereby distorting the ratios. It is, therefore, concluded from the present investigation that fertility restoration of A1 CMS system in pearl millet was governed by two major genes but with different types of epistatic interactions in different genetic backgrounds.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Size (in Bytes) 3.74 MB