Grain-filling problem in 'super' rice
Grain-filling problem in 'super' rice
复制标题
“超级”稻的灌浆问题
DOI：
10.1093/jxb/erp348
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发表时间：
2010-01-01
影响因子：
6.9
通讯作者：
Zhang, Jianhua
中科院分区：
文献类型：
--
作者：
Yang, Jianchang;Zhang, Jianhua
现代水稻（Oryza sativa L.）品种，特别是新培育的“超级”水稻，在一个穗上具有大量的小穗，具有很大的产量。然而，这些品种往往由于开花晚的劣势颖花（相对于开花早的优势颖花）灌浆差而无法发挥其高产潜力。传统的解释谷物灌浆差的想法是碳限制的结果。然而，最近的研究表明，碳水化合物的供应不应该是主要问题，因为它们在最初的灌浆阶段有足够的蔗糖。碳代谢关键酶活性低可能是灌浆不良的原因之一。灌浆中后期土壤适度干燥是解决灌浆不良问题的有效措施。低等颖花的信号传递、激素作用、基因表达和生化过程有待进一步的分子研究。
Modern rice (Oryza sativa L.) cultivars, especially the newly bred 'super' rice, have numerous spikelets on a panicle with a large yield capacity. However, these cultivars often fail to achieve their high yield potential due to poor grain-filling of later-flowering inferior spikelets (in contrast to the earlier-flowering superior spikelets). Conventional thinking to explain the poor grain-filling is the consequence of carbon limitation. Recent studies, however, have shown that carbohydrate supply should not be the major problem because they have adequate sucrose at their initial grain-filling stage. The low activities of key enzymes in carbon metabolism may contribute to the poor grain-filling. Proper field practices, such as moderate soil drying during mid- and late grain-filling stages, could solve some problems in poor grain-filling. Further studies are needed by molecular approaches to investigate the signal transport, the hormonal action, the gene expressions, and the biochemical processes in inferior spikelets.