IDENTIFICATION OF TRADITIONAL RICE (Oryza sativa L.) GENOTYPES TOLERANT TO COLD AND HEAT STRESS
| dc.contributor.advisor | SHAILAJA, HITTALMANI | |
| dc.contributor.author | AKSHATHA, H. R. | |
| dc.date.accessioned | 2020-10-07T06:56:47Z | |
| dc.date.available | 2020-10-07T06:56:47Z | |
| dc.date.issued | 2019-11-27 | |
| dc.description.abstract | Rice is susceptible to a variety of abiotic stresses including cold and heat stress that affects the grain yield. Genetic resources for tolerance of these stresses are available in indigenous races. 60 rice landraces and two aerobic rice varieties were evaluated under summer, kharif and late kharif, 2016 representing heat stress, control and cold stress situation during reproductive stage of the crop respectively. Evaluation at germination stage was done at 28±3°C and 42±3°C for heat tolerance. Similarly, for cold tolerance seeds were germinated at 28 ºC for 7 days (control) and 13 ºC for 15 days (cold). Fourteen stress indices were computed to quantify the response to both germination and reproductive stage cold and heat stress. Geometric mean and arithmetic mean were found effective for selection of genotypes for grain yield plant-1 under reproductive stage-cold and heat stress respectively. At germination stage, stress tolerance index was found best for germination per cent, shoot length and root length under both cold and heat stress. Marker validation was done using fourteen cold-tolerance and seven heat-tolerance specific SSR markers in the genotypes identified based on the effective indices giving more reliable result. At reproductive stage, Jeerigebattha and Sampige battha 2 and at germination stage, Marabattha and Puttabattha were tolerant to both stresses. These genotypes in future can serve as elite genetic material for developing suitable varieties for cold and heat stress situations. | en_US |
| dc.identifier.other | Th-12543 | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810152728 | |
| dc.keywords | Rice, abiotic stresses, aerobic rice varieties, Evaluation at germination stage | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 173 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU | en_US |
| dc.sub | Genetics and Plant Breeding | en_US |
| dc.theme | TRADITIONAL RICE (Oryza sativa L.) GENOTYPES TOLERANT TO COLD AND HEAT STRESS | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | IDENTIFICATION OF TRADITIONAL RICE (Oryza sativa L.) GENOTYPES TOLERANT TO COLD AND HEAT STRESS | en_US |
| dc.type | Thesis | en_US |