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我的推测是：这个原因是与豌豆的雌蕊形成有关。豌豆的雌蕊是由一个叫作心皮的变态叶内卷(nei juan)(ye nei juan)形成的。胚珠就长在心皮的边缘(bian yuan)，心皮不断内卷(nei juan)最终闭合形成边缘(bian yuan)胎座。当雌蕊传粉受精后，子房...
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