Effects of Dry Matter Production, Translocation of Nonstructural Carbohydrates and Nitrogen Application on Grain Filling in Rice Cultivar Takanari, a Cultivar Bearing a Large Number of Spikelets

• DOI: 10.1626/pps.4.173
• Publication Date: 2009-10-08T00:32:40Z
• Authors: Kenji Nagata; Satoshi Yoshinaga; Jun-ichi Takanashi; Tomio Terao
• Keywords: Sink (geography); Economic shortage

The effects of dry matter production and the remobilization nonstructural carbohydrates (NSC) on grain filling were investigated using Indica-based Japonica crossed rice cultivar Takanari, which can bear a large sink. For three years,beginning in 1994, shade treatments conducted with different nitrogen applications to develop variations plant growth. percentage ripened spikelets showed greatest correlation total amount carbohydrate supply per spikelet during 10 20 days after heading, calculated by adding increase ofNSC decrease leaf sheaths culms period. Between two components, was more important. NSC reserve played role compensating for shortage from assimilates heading tendency when limited. However, maximum ratio compensatory translocation estimated be only 48%, becauseofsmaller reservoir size compared demand. at not significantly increased increasing before heading. It concluded that ability it is effective than Nitrogen application negative effectson NSC. important optimize content maximize source supply.