Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/492022
Title: Study on diversity of rice in Nagaland and their suitability to changing climate
Researcher: Merentoshi
Guide(s): Das, Ranjan
Keywords: Agricultural Sciences
Agriculture Multidisciplinary
Life Sciences
University: Assam Agricultural University
Completed Date: 2022
Abstract: The present investigation was carried out during the year 2018 to 2020 to newlineevaluate the performance of some rice (Oryza sativa L.) genotypes from Nagaland newlineunder different CO2 and temperature regimes viz., Treatment I = Field (control), newlinetreatment II = (CO2 (550±20ppm) + Temp. of 40 C gt ambient) and Treatment III = CO2 newline(750±20ppm) + Temp. of 60 C gt ambient) under fully automated bioreactors with CO2 newlineand temperature control facilities in Stress Physiology Laboratory, Department of Crop newlinePhysiology, Assam Agricultural University, Jorhat-13. In the first experiment, 75 rice newlinegenotypes collected from different locations of Nagaland were subjected for initial newlinescreening for tolerance against elevated CO2 and temperature out of which 7 genotypes newlinewere selected for further study on their response mechanism of tolerance by comparing newlinewith the national check variety N22. The results revealed that treatment II had a positive newlineimpact on the various morpho-physiological parameter viz., plant height, number of newlineleaves, leaf area index, root volume and length, membrane stability index, total leaf newlinechlorophyll content, leaf nitrate reductase activity, proline in all the genotypes whereas newlinea declining trend indicating the deleterious effect of high temperature, at a higher CO2 newlineand temperature in treatment III was observed in all these parameters. Similarly, newlinesignificant variation in photosynthesis and its related parameters (viz. stomatal newlineconductance, internal CO2, transpiration) affected the photosynthetic rate and their newlinepartitioning to root, shoot and reproductive organ under both the treatments as newlinecompared to field condition. These factors ultimately contributed to growth efficiency newlineand yield of the plant. Amongst the treatments, significant increase of H2O2, MDA newlinecontent was recorded in treatment III as compared to treatment III. Kohima Special and newlineN22 recorded lower H2O2 and MDA when compared to other local genotypes...
Pagination: 
URI: http://hdl.handle.net/10603/492022
Appears in Departments:Crop Physiology

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01_title page.pdfAttached File258.24 kBAdobe PDFView/Open
02_prelims.pdf458.82 kBAdobe PDFView/Open
03_contents.pdf24.67 kBAdobe PDFView/Open
04_abstract.pdf46.42 kBAdobe PDFView/Open
05_chapter 1.pdf109.41 kBAdobe PDFView/Open
06_chapter 2.pdf170.71 kBAdobe PDFView/Open
07_chapter 3.pdf478.6 kBAdobe PDFView/Open
08_chapter 4.pdf795.38 kBAdobe PDFView/Open
09_ chapter 5.pdf126.36 kBAdobe PDFView/Open
10_ annexure.pdf816.39 kBAdobe PDFView/Open
80_recommendation.pdf389.43 kBAdobe PDFView/Open
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