The results showed that, the digestive canal initiated from the gastrocoele, which was formed by invagination at gastrula stage.
结果表明，单环刺消化道起源于原肠胚期内陷而成的原肠腔；
2
The pistil shape and the development course of gastrula are not the restriction factor which cause the difference of compatibility intensity in almond.
雌蕊形态和胚囊的发育过程不是扁桃亲和性强度存在差异的制约因子。
3
Embryos at 4 ~ 8 cell stage showed higher survival rate and lower abnormal embryo rate than embryos at multicellular stage or early gastrula stage when radiated at the same dose and dose rate.