外胚乳

壁呈波浪形的外胚乳细胞富含淀粉粒。

Plenty of starch grains present in perisperm cells .

外胚乳是种子萌发和幼苗生长的主要营养来源。

The perisperm of the seed is the main structure for storing nutritive materials .

外胚乳约3-4层细胞，细胞壁波浪形弯曲，内胚乳发达。

There are about 3-4 layers of perisperm cells , the cell wall of which is curved .

外胚乳细胞主要含许多脂类物质及少量蛋白质颗粒，不含淀粉。

Cells of perisperm contain mainly lipids , a small amount of protein granulars but no starch grain .

营养物质可以贮藏于由珠心产生的一种特殊组织，叫外胚乳。

Food materials may be stored in a special tissue derived from the nucellus , called the perisperm .

成熟橡胶树种子的胚和外胚乳蛋白质含量约占干重的15%。游离氨基酸含量约占干重的0.6%。

The embryo and prosembryum of the mature seed of Hevea brasiliensis contain about 15 % proteins and 0.6 % free amino acids based on dry weight .

环形胚包围的珠心组织，逐渐发育并积累大量的淀粉而形成外胚乳，主要用于种子萌发时的养料。

The nucellar tissue enclosed by circular embryo develops gradually and accumulates large amounts of starch and develops into perisperm which mainly provides nutrition for seed germinating .

而珠心组织则一天天增厚，其细胞体积也一天天增大，最后成为种子的永久性的营业养组织即外胚乳。

However , the nucellus becomes thicker and thicker and eventually constitutes the major portion of the mature seed and forms the permanent food storing tissue called prosembryum .

因此，这两组蛋白质应当是橡胶树种子的主要贮藏蛋白质，并且可能是外胚乳和子叶细胞中液泡蛋白质物质的主要成分。

The results show that Group I and ⅱ proteins are the major stomp proteins in Hevea seeds and may be the major composition of the vacuole protein masses .

芡实种子萌发期，子叶吸收外胚乳中养分供萌发和幼苗发育，具有吸器的功能。

In the seed germination stage of Euryale ferox the cotyledons absorb nutritive substances from its perisperm for the growth and development of young seedling and perform a haustorial function .

合子分裂经球形胚到心形胚阶段近2个月期间珠心一直没有淀粉积累，至胚胎发育后期器官分化阶段，珠心才重新迅速积累淀粉并最终发育形成外胚乳。

During zygote-division , from sphere-embryo to heart-embryo , no starch grins were found within nucellus which however deposited starch again as the embryo began to differentiate and finally developed into perisperm .

与种子的这种生理状态一致，子叶和外胚乳中的贮藏蛋白质存在于细胞的大液泡中，并不形成通常在正常休眠种子中看到的那种蛋白体。

In accordance with the physiological state of the seeds , thestorage proteins accumulate in the large vacuoles of the cells of the cotyledon and perisperm , nosuch protein bodies are formed as found in normal dormant seeds .

培养基中添加GA3，可提高去掉外种皮带全胚乳和带1/2胚乳种子的发芽率，而对带1/3胚乳的种子则无效果。

GA3 promoted the germination of seeds with whole or 1 / 2 endosperm , but had no effect on seeds with 1 / 3 endosperm .