妃子笑荔枝早花大果和晚花小果与营养竞争的关系Relationship Between Nutrient Competition and Differential Fruit Sizing of Feizixiao Litchi Fruit From Early and Late Blooms
李建国,黄辉白,黄旭明
摘要(Abstract)：
对同一穗上的妃子笑早花大果和晚花小果的对比研究发现,各时期处于大体相同发育阶段的早花果果实争夺水分和溶质的能力均大于晚花果。14C-蔗糖标记实验更证实早花果比晚花果具有大得多的争夺碳水化合物能力。对矿质营养的吸收差异总体看来,早花果争夺矿质营养的能力明显强于晚花果,具体表现为:果皮中Zn、K、N、Mg和P的含量和果肉中N、K、Zn和Ca含量均是早花果明显大于晚花果。据此认为,早花果的果实大与其具有强大的竞争库力有关;果实中K、Zn和N的水平可能与荔枝大果性状呈明显的正相关。
关键词(KeyWords)： 荔枝(Litchi chinensis Sonn.);早花果;晚花果;果实大小;营养竞争
基金项目(Foundation): 广东省自然科学基金资助项目(960440)。
作者(Author): 李建国,黄辉白,黄旭明
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