Journal of Food, Agriculture and Environment

Impact of heat stress on growth and yield of rice (Oryza sativa L.) cultivars


Mohammad Taghi Karbalaei Aghamolki 1, Mohd Khanif Yusop 1*, Fateh Chand Oad 1, Hawa Zee Jaafar 2, Amir Mahdi Khalatbari 2, Sharifh Kharidah 3, Mohamed Hanafi Musa 1

Recieved Date: 2015-11-04, Accepted Date: 2016-03-30


Heat stress beyond the threshold level at reproductive phase inhibits rice growth as well as yield by producing more sterile spikelets in the panicle. The glass house study was conducted at Universiti Putra Malaysia during 2012 (latitude 02°59’N, longitude 101°43E’ and altitude 64 m above the sea level). The growing environmental conditions were normal temperature (32+2oC day time) and heat stress (38+2oC day time) given to seven rice cultivars (Neda, Hovaze, Hashemi, Domsiah, Tarom, Fajr and MR219). The heat treatment was applied at the start of reproductive stage. The plants of Hashemi grown in normal temperature (32+2oC day time) had maximum growth traits viz. plant height in Hashemi, tillers in Neda, panicle exertion in Domsiah and Tarom, flag leaf width in Hovaze. Similarly, improvement in yield components viz. higher effective tillers per hill in Hovaze and Neda, fertile spikelets per panicle in MR219, 1000 grain weight and grain yield in Neda were found grown in normal temperature. However, heat stress (38+2oC) inhibited all the growth and yield components by producing less effective tillers, 1000 grain weight and higher number of sterile spikelets. In conclusion, indigenous MR219 and exotic Neda produced high grain yield in normal growing conditions and Hovaze in heat stress condition.


Rice, heat, stress, growth, yield

Journal: Journal of Food, Agriculture and Environment
Year: 2016
Volume: 14
Issue: 2
Category: Agriculture
Pages: 111-116

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