Author: Chen D. Gunawardena T.A. Naidu B.P. Fukai S. Basnayake J.
Publisher: International Seed Testing Association
ISSN: 1819-5717
Source: Seed Science and Technology, Vol.33, Iss.2, 2005-07, pp. : 471-479
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Abstract
Prevalence of low temperature at sowing results in poor rice seed germination, seedling establishment and vigour in several temperate rice growing countries around the world. Rice seed of four cultivars (Sasanishiki, H433, HSC-55 and Doongara) was soaked in various combinations of gibberellic acid3 (GA3) and glycinebetaine (GB) in petri dishes placed in a low temperature glasshouse (18/13°C; day/night) for 2 days. After the 2 days soak, 10 treated seed were transferred into plastic pots filled with soil and seedlings were grown in the same glasshouse, where seed was treated. Seedling emergence was least affected by low temperature in cold tolerant cultivar, HSC-55, while other three cultivars showed reduced seedling emergence. However, seedling emergence increased significantly in some cultivars in response to seed treatment with GA3 and/or GB. Seedlings emerged faster even in the cold tolerant cultivar, HSC-55, as measured by reduced mean emergence time (MET), in response to GB. Seedling height and seedling dry matter also increased in response to both GA3 and GB. Combined treatment of both GA3 and GB was more beneficial in increasing seedling emergence and vigour than the treatment with only GA3 or GB. We demonstrated significant genotypic differences for seedling emergence and vigour and not all cultivars responded to the treatment with GA3 and GB, under low temperature.
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