• K.Geetha
• R.Latha
• M.Dhandapni

Rice is cultivated all over the world especially Asian countries. Though rice is adaptable to tropical to temperate climate, low temperature is the major limitation in temperate countries. Similarly in India cold stress affects rice production in high altitude regions. Low temperature at various growth stages especially seedling stage and reproductive stage leads to crop failures. Cold stress at seedling stage leads to seedling injury and even seedling mortality in severe cases which leads to poor crop stand. At reproductive stage, severe yield loss due to incomplete exsertion of panicle and spikelet sterility.In Krishnagiri district of Tamilnadu the popular varieties viz., BPT 5204, White Ponni, Paiyur 1 and ADT 43 are highly susceptible to cold stress and hence it is necessary to breed varieties with cold tolerance so as to cultivate rice during September- October sowing. With this aim the popular rice varieties viz.,ADT 43, Paiyur 1, TKM 13, IR 42, IR36, PS2, Karuppu nel and White ponni were screened for cold tolerance. The varieties IR 36, IR 42, PS 2 and Karuppunel were found to be cold tolerant. Hybridization among these varieties yielded 31 hybrids and selection from the segregating population from F1 to F6 generation was done to select the homozygous line PYR 12-07-01. The study on yield and yield attributes of the culture PYR 12-07-01along with other check varieties revealed that it has high yield potential of 6.1tonnes/ha with 24 productive tillers/plant and 260 grains/panicle. The new culture PYR 12-07-01 performed better than the checks IR 20 and IR 36. Yield increase over the checks IR 20 and IR 36 was 11.5 % and 10.1% respectively. From the yield trials conducted, an early maturing high yielding rice culture PYR 12-07-01, a hybrid derivative of the cross ADT 43 x PS 2, maturing in 105 days has been identified. This culture is suitable for cultivation in Northwestern region of Tamil Nadu during cold season (Oct-Jan).

Breeding of Cold Tolerant Rice with High Yield and Desirable Grain Quality Traits

"Breeding of Cold Tolerant Rice with High Yield and Desirable Grain Quality Traits ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 10, page no.1284-1292, October-2020, Available :http://www.jetir.org/papers/JETIR2010165.pdf

"Breeding of Cold Tolerant Rice with High Yield and Desirable Grain Quality Traits ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 10, page no. pp1284-1292, October-2020, Available at : http://www.jetir.org/papers/JETIR2010165.pdf