So far , achieved studies on calcium in embryo sac of angiosperm mostly located in memebrane - binding calcium and total calcium but little in free cytoplasmic calcium ( [ ca2 + ] cyt ) 到目前为止，对植物胚囊中钙的研究也绝大多数局限于总钙和膜钙的的测定，而对于被子植物胚囊内胞质游离钙的研究则几乎是空白。
Thirdly , it is possible that acorus is in an isolated , primitive position among the monocotyledon . the systematic position of acorus among the angiosperms deserves to be studied deeply 菖蒲属可能是整个单子叶植物中一个较孤立的、原始的类群，它在整个被子植物中的系统地位，目前尚无定论，还有特深入探讨。
However , a small minority of angiosperms that perform apomixsis can overcome the effect of genomic imprinting to normally develop its endosperms without fertilization or with false fertilization 然而极少数进行无融合生殖的被子植物，它们的胚乳可以在假受精或不受精的情况下克服基因组印记效应的影响且正常发育。
Ching in 1978 ; those of the naked - seed plants ( gymnosperms ) follows that of kubitzki in 1990 ; and those of the flowering plants ( angiosperms ) follows the system of cronquist in 1988 标本是以科归类，蕨类植物采用了1978年的秦仁昌系统，裸子植物采用1990年的kubitzki的系统，被子植物则采用1988年cronquist的系统。
As an effective evolution strategy of angiosperms , double fertilization can enhance the survival of the embryos , seeds and seedlings in which endosperms play a key role in the development of seeds and embryos 摘要双受精是被子植物的一个有效的进化策略，增加了胚和种苗成活的机会，其中胚乳在胚以及种子发育中至关重要。
Among thein , 2 species and 1 species are respectively pteridophyta and gymmospermae . all the others are angiosperm . the number of genera and species amount to 97 . 27 % and 97 . 87 % of all the genera and species of the wetland 其中蕨类植物2种，裸子植物1种，而被子植物的属数和种数分别占南大港湿地植物总属数和总种数的97 . 27和97 . 87 。
As a result , western liaoning province has become one of the most important areas in the world for the study on the origin of birds , dinosaur evolution , and the early evolution and radiation of birds , mammal and angiosperms 我国辽西地区已经成为世界上研究鸟类起源，恐龙的进化，鸟类、哺乳动物以及被子植物的早期演化和辐射等最重要的地区之一。
Through investigation to west lake spot in huizhou , it showed that the pot had 127 species woody plant which belong to 48 families , including 6 families 8 species gymnosperm and 42 families 118 species angiosperm 摘要通过对惠州市西湖风景区的木本植物资源的调查，结果表明该景区的木本植物种类总类为48科127种，其中裸子植物有6科8种，被子植物有42科118种。
Because of the special position of the genus paeonia in angiosperms and the enormous economic value of cultivated tree peonies , it is of great importance to have a better understanding of the interspecific relationships among species in sect 由于芍药属在被子植物中的特殊系统位置和栽培牡丹重要的经济价值，研究牡丹组的种间关系具有重要的理论和实践意义。
Hofmeister aso showed that the gametophytes and sporophytes of seed - bearing plants were homologous with those of ferns and mosses and that the gymnosperms formed a plant group between the latter and the angiosperms 他认为种子植物的孢子体和配子体与蕨类以及苔藓类是同源的，还指出裸子植物形成了一个单独的组群，它是位于蕨类植物与被子植物之间的一个植物类群。
