The endosperm, which is derived from two polar nuclei fusing with one sperm, is a triploid tissue whose genetic constitution is more complex than common diploid tissue.

• 由于胚乳是由雌性的两个极核和雄性的一个精核受精发育而成的三倍体组织,因此胚乳性状的遗传基础要比通常的二倍体农艺性状复杂得多。