NH
3 emission from leaves of three rice (
Oryza sativa L.) cultivars, Akenohoshi, Shirobeniya and Kasalath, was examined using a simple open chamber system. In the three cultivars, NH
3 emission rate (AER) and NH
4+ content of leaves decreased with decreasing NH
4+ concentration in the root medium, but these values differed significantly with the cultivar. In the daytime, AER, NH
4+ content and glutamine synthetase (GS) activity in leaves changed similarly with maximum values around midday. Akenohoshi showed significantly lower AER and NH
4+ content but higher GS activity than Kasalath. The difference in AER among the rice cultivars may be related to the activity of GS involved in photorespiratory NH
3 recycling. Akenohoshi can be a breeding material useful for improving N recycling.
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