[Effects of ozone stress on amylose content and starch RVA profile in grains located at diffe-rent positions on a panicle].

The increase of ground-level ozone concentration significantly reduces rice yield, but its effect on grain quality in association with the positions on a panicle was largely unknown. The effects of ozone stress on amylose content and RVA profile of rice grains located at different positions of panicles were studied by using a sunlit gas fumigation platform. Eight varieties representing different types of rice were fumigated under ambient (9 nL·L) or elevated ozone (100 nL·L) concentrations from transplanting until maturity.