Physiology of spikelet development on the rice panicle: is manipulation of apical dominance crucial for grain yield development?
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Manipulation of apical dominance is crucial for grain yield development in rice panicles . Heterogeneous architecture, with intergrain apical dominance, allows the plant to sacrifice some spikelets during inclement weather conditions while preserving others for seed production . However, breeding efforts to increase grain production by favoring extra-heavy panicles with a large number of spikelets have reduced intergrain apical dominance, leading to decreased assimilate partitioning to the spikelets . Poorly filled basal spikelets and low endosperm cell division rate contribute to low grain filling and yield potential . Manipulation of gene expression, such as CYCB1;1, CYCB2;2, CYCH1;1, KRP;1, and KRP4, in the basal spikelets can significantly improve yield performance . Application of growth regulators like gibberellic acid (GA3) and kinetin can improve development and grain yield on all branches of the panicle . Nitrogen application can increase secondary branch number, while spikelet filling on primary branches is under genetic control . Removal of spikelets from the apical region of the panicle can increase the percentage of filled grains .
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| Papers (5) | Insight |
|---|---|
2 Citations | The provided paper does not directly address the question about the physiology of spikelet development and the manipulation of apical dominance in rice panicles. The paper focuses on spikelet sterility and the impact of nitrogen application on grain filling in different rice genotypes. |
37 Citations | The provided paper discusses the regulation of spikelet development in rice by hormones, specifically gibberellic acid (GA3), kinetin, and 3-indole acetic acid (IAA). It does not directly address the manipulation of apical dominance for grain yield development. |
| The provided paper discusses the regulation of spikelet development in rice by growth regulators. It does not specifically mention the manipulation of apical dominance or its importance for grain yield development. | |
69 Citations | The paper discusses the importance of intergrain apical dominance in spikelet development in rice. It suggests that a compromise between heterogeneous and homogeneous architecture of the inflorescence can benefit spikelet filling and grain yield. |
| The answer to the query is not present in the provided paper. The paper discusses the differential grain filling in rice spikelets based on their spatial location on compact panicles, but it does not specifically address the manipulation of apical dominance for grain yield development. |
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