STUDY ON EFFECT OF MUTATION ON RANJIT SUB-1 FOR YIELD AND YIELD ATTRIBUTING CHARACTERS

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dc.contributor.advisorChetia, Sanjay Kumar
dc.contributor.authorShivam, Kasturi
dc.date.accessioned2020-11-06T09:54:09Z
dc.date.available2020-11-06T09:54:09Z
dc.date.issued2019-07
dc.description.abstractRice (Oryza sativa) has been grown in Assam from time immemorial and it is the single most important crop in the state and its adjoining areas, because of its enormous variability, adaptability and preference in the state. Sali or winter rice is the dominant crop of the state covering 18.7 lakh hectares and contributing 73% of the total rice production. Out of 18.7 lakh hectares of Sali areas 12.7 lakh hectares come under flood free shallow lowland. Shallow lowland is as good as irrigated areas and high yielding varieties like Ranjit, Bahadur, Mahsuri, Gitesh etc. are grown. Amongst the HYVs, Ranjit was the most popular variety but farmers finding it difficult to go for Rabi crops after the harvesting of Ranjit due to its longer duration. One of the reasons for the low farmer‟s income is lower cropping intensity. Farmers of Assam prefer to grow longer duration rice variety during kharif season for which it is difficult to increase cropping intensity. Therefore, it is essential to develop the shorter duration version of popular rice variety Ranjit. The seed of Ranjit Sub-1 was treated with three doses 170Gy, 210Gy and 240Gy of gamma ray during May, 2017. The M1 generation of each doses along with the checks (Luit, Shraboni and Ranjit Sub-1) grown during Sali, 2017. The experiment was conducted by Augmented Design. The data of Days to 50% flowering, Plant height, EBT, Fertile spikelet etc. was recorded. Sterility percentage increases with increases in irradiation. Highest sterility percentage was recorded in 240Gy Gamma ray. Further from the recorded data of 500 plants of each dose, it was found there is significant effect of mutation in all the three doses for all the characters except in tiller numbers. Three desirable early mutants were selected during Sali, 2017. The M2 progeny was raised during Sali, 2018. The segregation for Days to 50% flowering and Maturity duration was studied and it was found to fit well in 9:3:3:1 ratio. The effect of mutagens on Sub-1 QTL was also studied. We have confirmed the presence of Sub-1 QTL in treated seeds with the help of SSR marker (Sub1BC2). Ranjit Sub-1 and Ranjit were considered as positive and negative check respectively. During gel analysis we have observed both positive and negative type among progenies and hence we concluded that there was effect of Sub-1 QTL.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810154607
dc.language.isoEnglishen_US
dc.publisherAAU, Jorhaten_US
dc.subPlant Breedingen_US
dc.themeSTUDY ON EFFECT OF MUTATION ON RANJIT SUB-1 FOR YIELD AND YIELD ATTRIBUTING CHARACTERSen_US
dc.these.typeM.Scen_US
dc.titleSTUDY ON EFFECT OF MUTATION ON RANJIT SUB-1 FOR YIELD AND YIELD ATTRIBUTING CHARACTERSen_US
dc.typeThesisen_US
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