embryo sac

embryo sac的基本解释

-

胚囊

与embryo sac相关的网络例句 [注：此内容来源于网络，仅供参考]

The reseach on activity changes of SOD, POD and CAT during the somatic embryogenesis of Y35 showed:(1) The activty of SOD was from 52.98 to 133.20 U·g-1·h-1, and remained a rising trend after early single embryo forming, this revealed that SOD might be positively correlated to the differentiation of embryogenic cell and the development of somatic embryo.(2) The activty of POD was from 0.05 to 0.50 U·mg-1·min-1, ascended firstly and desceded later, and was highest in embryogenic callus and lowest in late single embryo , this revealed that POD might be positively correlated to the division and differentiation of proembryo mass, while negatively correlated to the development of PEMⅢto late single embryo.(3) The activty of CAT was from 0.86 to 2.81 U·mg-1·min-1, showed an up-down-up trend, reaching to the highest peak at the time of early embryo formating and decreasing to the lowest at the time of early cotyledonary embryo formating, this revealed that CAT might be positively correlated to the development of early single embryo, while negatively correlated to the formation of middle single embryo and early cotyledonary embryo.The changes in activty of SOD, POD and CAT indicated these three antioxidant enzymes coregulated the differentiation and development of embryogenic cells during Larix somatic embryogenesis.4. Differentially expressed cDNA libraries of the stages of proembryo mass and somatic embryo maturation were successfully constructed by suppression subtractive hybridization.

对Y35体细胞胚胎发生过程中抗氧化酶活性变化的研究显示：(1)SOD活性在52.98~133.20 U·g-1·h-1之间，并在早期单胚形成后一直保持上升的趋势，表明其与胚性细胞的分化及体细胞胚的发育均具呈正相关；(2)POD活性在0.05~0.50 U·mg-1·min-1之间，呈现出先下降后升高的趋势，在胚性愈伤组织中最高，而在后期单胚形成时降至最低，表明其与原胚团的分裂和分化呈正相关，但与PEMⅢ向后期单胚的发育呈负相关；(3)CAT活性在0.86~2.81 U·mg-1·min-1之间，表现出升-降-升的变化趋势，在早期单胚形成时升至最高，在早期子叶胚形成时降至最低，表明其与早期单胚的发育呈正相关，而与中期单胚和早期子叶胚的发育呈负相关。

Megaspore development and abortion of"Pingyi Tiancha"Compar-ing with regular developing megaspore of normal M.baccata,the megasporemother cellof"Pingyi Tiancha"could form mono-nucleus embryo sacby perhaps irregular meiosis,then most of sexual MES depauperatedand degenerated,finally aborted,or only a few further developed.Of asexualembryo sac,one or more large cells at the chalazal end of nucellus developed in-to one to more asexual embryo sac initials.After the competition between sexu-al embryo sacand asexual embryosac,most ovules only had one asexual embryo sac matured.

平邑甜茶大孢子的发育和败育与正常发育的山定子大孢子对比，平邑甜茶大孢子母细胞经减数分裂能形成单核胚囊，之后多数有性胚囊萎缩、退化而败育，只有极少数进一步发育；而无性胚囊则从胚珠合点端1个或多个较大的珠心细脆形成并首先发育为一个或多个无性胚囊原始体；经过有性胚囊和无性胚囊以及无性胚囊和无性胚囊之间的竞争，多数胚珠只有一个无性胚囊成熟。

Observing the mature embryo sac of the mutant: It was found thatthe embyo sac appeared in typical polygonum type and more than 90% of the embryo sac hadintegral inner structure. They had egg apparatus, two polar nucleus and three antipodal cells , and their position in the embryonic sac was normal .

幼穗分化、成熟胚囊观察发现，90％以上的胚囊具有完整的内部结构，有卵器、两个极核及多个反足细胞，且位置正常，胚囊呈现典型的蓼型结构；同时还观察到雌、雄器官的发育是同步的。

与embryo sac相关的网络解释 [注：此内容来源于网络，仅供参考]

embryo sac：胚囊

单孢型胚囊是指胚囊母细胞减数分裂形成四个单倍体的大孢子,4个大孢子沿珠心呈线形或T形排成,其中靠近珠孔端的三个细胞相继程序化死亡,仅远离珠孔端的一个具功能的大孢子继续发育,形成单细胞胚囊(embryo sac),再由单细胞胚囊发育

embryo sac：胚膜

embryo of a plant seed 植物种子的胚 | embryo sac 胚膜 | embryo sac haustorium 胚囊吸器

compound embryo sac：复胚囊

compound elastic scattering | 复合核弹性散射 | compound embryo sac | 复胚囊 | compound engine | 复合式发动机

embryo sac plants：胚囊植株

再生植株:hybrid plants | 胚囊植株:embryo sac plants | 禾本科植物:Gramineous plants

bisporic embryo sac：双孢子胚囊

单孢子胚囊 monosporic embryo sac | 双孢子胚囊 bisporic embryo sac | 四孢子胚囊 tetrasporic embryo sac