The polar nuclei fuse during fertilization.

极核在受精时融合.

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The polar nuclei autonomously developed into endosperm without fertilization and the egg apparatus ultimately degenerated.

卵器最终退化,极核不经受精自发形成胚乳.

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However, the polar nuclei might develop the normal endosperm as long as they had been fertilized.

但是, 其极核必需经过受精过程才能发育为胚乳.

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