25. Response of rice varieties to different temperature regimes

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Mahmooda Buriro, Ihsan Ahmed Soomro Shahla Karim Baloach Nighat Seema Soomro, Saiqa Buriro Muhammad Tahir Khan



A laboratory experiment was conducted to find out the influence of temperature on germination traits of various rice varieties. Seeds of ten differentrice varieties (IR-6, DR-83, DR-92, Shahkar, Bangelo, IR-8, DR-82, Kangni-27, Shandar and Sarshar) were observed the different germination linked traits influenced by 5 different temperatures regimes (30, 35, 40, 45,50oC) in germinator. The germinability and related traits of various rice varieties showed significantresponse to changes in temperatures. The highest seed germination (89.02%) was observed after 48 hours under 40oC temperature. However, 35oC was found to be themost suitable temperature for growth and vigor of seedlings.Whereas,in seedling growth and vigor traits, variety Bangelo showed superiority with highest shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, and vigor index. It was concluded that for obtaining higher germination in rice varieties, 35oC proved to be most suitable temperature, while germination and almost all other studied traits were adversely affected with increasing temperature.

Keywords: Germination, Rice seed vigor, Temperature stress


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