Physiological processes associated with high yield traits in modern rice varieties

Abstract

<span>Understanding the physiological processes associated with high yield traits in modern crop<br /><span>varieties is essential to further increase grain yield and improve nutrient management strategies.<br /><span>Field trials were conducted to study the effects of fertilization and variety on the grain yield of<br /><span>rice (<span><em>Oryza sativa </em><span>L.) with two fertilizer levels and 18 modern varieties. The objectives were to<br /><span>evaluate yield components, time courses of dry matter production and time courses of N, P<span>2<span>O<span>5<br /><span>and K<span>2<span>O accumulation among different yield categories and to determine physiological<br /><span>processes associated with yield-trait relationships. Variation among varieties had a considerable<br /><span>impact on rice grain yield, regardless of fertilization. Close correlations were observed between<br /><span>grain yield and effective panicles, dry matter production and N, P<span>2<span>O<span>5 <span>and K<span>2<span>O accumulation.<br /><span>Differences in dry matter production and P<span>2<span>O<span>5 <span>accumulation among different yield categories<br /><span>began at anthesis; differences in N and K<span>2<span>O accumulation emerged earlier. It can be concluded<br /><span>that consistent increases in dry matter production (especially post-anthesis) and N, P<span>2<span>O<span>5 <span>and<br /><span>K<span>2<span>O accumulation are crucial for further improvements in rice yield-trait relationships.</span></span></span></span></span></span></span></span></span></span></span></span><br /><br class="Apple-interchange-newline" /></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>