To find the reason of low seed-setting of red Pitaya, it compared flower shape, pollen size and pollen viability between red pitaya and white pitaya flower.
本试验通过红肉火龙果和白肉火龙果花的外形、花粉粒大小和生活力的差异比较，探究红肉火龙果授粉结实率低的原因。
It was also observed that the "inter-grain apical dominance" in hybrid rice was stronger than its restorer, which might be one of the main reasons for low seed setting in hybrid rice combination.
强势粒对弱势粒物质摄取能力的优势，可能是杂交稻籽粒结实率低下的重要原因之一。
After low temperature stress, the seed setting rare of three stages were decreased, and the number of secondary branches significantly decreased, while other indexes were not remarkable... 3.
低温胁迫后，三个时期的结实率都较常温下的有不同程度的降低，二次枝梗在孕穗期较对照有明显减少，其他则变化不明显。
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