期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 61, 期 1, 页码 1-4出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erp348
关键词
Carbohydrate metabolism; grain-filling; inferior spikelets; soil drying; super rice
资金
- National Basic Research Program [2009CB118603]
- National Natural Science Foundation of China [30771274, 30871480]
- Doctoral Foundation of the Ministry of Education, China [200811170002]
- Research Grant Council of Hong Kong [HKBU 262809]
- Hong Kong University Grants Committee [AOE/B-07/99]
- Hong Kong Baptist University Strategic Development Fund
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.
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