1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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Subject: search.filters.subject.Cytoplasmic

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    Alternative sources of cytoplasmic male sterility and genetic analysis of fertility restoration in Rice (oryza Sativa L.)
    (Department of Pnimal Breeding and Genetics, College of Horticulture,Vellanikkara, 2001) Biju, S; Radakrishnan, V V
    Investigation for alternative source of cytoplasmic male sterility suitable for warm humid tropical climatic conditions was conducted at Agricultural Research Station, Mannuthy and College of Horticulture, Vellanikkara (1998•• 2001). The study included the evolution of alternative source of cytoplasmic male sterility, potential CMS lines, screening of genotypes for fertility restoration and its genetic analysis. From the backcross experiments conducted, sterile cytoplasmic source was confirmed to be that of Bhadra and saline tolerant rice variety Vytila-3. The cytoplasmic nuclear interaction exhibited by various crosses studied, resulted in the manifestation of male sterility. The four cross combinations with Vytila-3 and Bhadra as cytoplasmic maternal sources exhibited increase in male sterility with each step of backcross. In the case of Vytila-3 x IR 36, 100 percentage male sterility was obtained in the F2BC3 generation. This points out the relevance of backcrossing to evolve fully male sterile line in other crosses also. With respect to grain yield and components, the highest positive gca effect was observed in Bhadra followed by Mattatriveni. Since the dominance variance of this character was greater than the additive genetic variance, there is scope for hybrid vigour exploitation. The estimation of heterosis in the case of hybrids produced was significant enough to explore the prospects of hybrid rice suited to warm humid tropics. Generation mean analysis revealed that the characters tillers at harvest, panicle length, spikelets per panicle, grain LIB ratio and pollen sterility percentage were controlled by both allelic contribution and its interactive effects and hence for improving the characters, hybridization followed by selection can be resorted to.
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    Physiological approaches for manipulating male sterility in thermosensitive genic male sterile system for hybrid rice seed production
    (Department of Plant Physiology, College of Agriculture,Vellayani, 2019) Gayathri Rajasekharan; Roy Stephen
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    Studies in some varieties and inter-racial hybrids of Oryza sativa Linn.
    (Faculty of Cytogenetics and Plant Breeding, Agricultural College and Research Institute, Coimbatore, 1964) Karunakaran, K; Ponnaiya, B W X
    The evolution in the concept of geographical rices in Oryza sativa L. The nature and extent of sterility in inter-varietal hybrids and the different explanations for the same, heterosis and its utilization of rice breeding, and pachytene analysis as amethod of karyotypic studies in the genus Oryza with special reference to the intervarietal karyotypic diversity in O.sativa have been briefly reviewed.