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abortive pollens
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  败育花粉
     Bivalent range is 1-6pairs, and appear trivalent, chromosome configuration is i6.4Ⅰ+4.0Ⅱ+0.4Ⅲ, average of chiasmata frequence is i. 07. Because the tetrads are abnormal to form abrerrant and abortive pollens, it results in sterility of the hybrid F_1 Doubled chromosomes of F_1(A_2×G) synthesised a allotetraploid cotton.
     由于四分体发育不正常,形成畸形败育花粉,导致杂种F_1高度不育。 对A_2×G F_1进行染色体加倍,合成异源四倍体,观察F_2PMC减数分裂时,染色体数为52条。
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  “abortive pollens”译为未确定词的双语例句
     E2 and E5 sets mainly produced stainable abortive pollens(SAP),whereas E3 set mainly did empty abortive pollens(EAP).
     E2和E5位点组的作用主要产生染败花粉,而 E3位点组的作用主要产生空败花粉。
短句来源
     the rate of abortive pollens was 99.97%; the outcrossed seed setting rate was 45.5%; the stigma exsertion rate was 87.1% with 56.5% of double-stigma exsertion rate.
     该不育系农艺性状稳定,株型较好,不育株率达100%,花粉败育率达99.97%,柱头外露率87.1%,其中双外露率56.5%,米质优,高抗稻瘟病,配合力较好。
短句来源
     3.Stage of pollen abortion:With the fact that most of mature pollens are typical abortive pollens and the observation on the structure of microspore, we identified that the critical period for pollen abortion was from late microspore stage to early bicellular pollen stage , and many crucial changes occurred just at that period.
     根据成熟花粉主要为典败型花粉以及细胞学结构变化观察结果确定,D18S品种的败育时期主要发生在小孢子晚期到二胞花粉早期。
短句来源
     So,the abortive pollens were informed. The resules of backcrossing indicated, though the new breeding sterile were near to their maitainers on appearance and basic characterristics, but ever existed significant differences between them, Jin-A represented basic characters such as prematurity, longer fiber, lower lint, more sterile seeds and fewer individual boll seeds.
     回交转育结果发现,尽管新育成的不育系,在外观和基本特性上已与保持系趋于一致,但某些性状依然存在着显著差异,表现出早熟、绒长、衣分低、不孕籽多、单铃籽少的基本特征;
短句来源
     The abortive pollens of A-line in “microsporemonocaryon” period occurred,in which the quantity of peroxidase isozymes in antherswere obvious less than that of B-line and R-line.
     进入“小孢子单核期”的 A 系花粉粒已发生败育,其花药的过氧化物酶同工酶明显少于 B 系和 R 系。
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     When the daily mean temperature is over 26.5℃, the pollens become abortive and sterility is exhibited.
     温度诱导育性转换的敏感期为花粉母细胞减数分裂期。
短句来源
     About Abortive Bribe
     论行贿罪的未遂
短句来源
     30% for polyvalent pollens.
     夏秋花粉占30%,
短句来源
     TEM Observation of the Pollens
     花粉的透射电镜观察
短句来源
     There was no obvious correlation between abortive rate of pollens and self-seeds rate of Zhou 13S-1.
     相关分析表明花粉育性和自交结实率无显著相关。
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The features of anther and pollen development of male-sterile wheat line "you-boa" were studied morphocytologieally and those of the maintaining line were secured for comparison.The results obtained are summarized as follows: 1. Anther of male-sterile line consists of one to four chambers. The decrease of chamber number is partly due to the fusion of anther chambers. 2. The features of anther and pollen development in male-sterile wheat were found in two types: (1) Anther with abortive pollen....

The features of anther and pollen development of male-sterile wheat line "you-boa" were studied morphocytologieally and those of the maintaining line were secured for comparison.The results obtained are summarized as follows: 1. Anther of male-sterile line consists of one to four chambers. The decrease of chamber number is partly due to the fusion of anther chambers. 2. The features of anther and pollen development in male-sterile wheat were found in two types: (1) Anther with abortive pollen. Under this type, three subtypes could be again divided. (a) Pollen development was arrested at l-nucleate. (b) l-nucleate pollen aborted in some anthers. (c) One anther was found to have hypertrophitic tapetum. (2) Anther without pollen due to PMC disorganization. There are three cases in the disorganization of the pollen mother cells. (a)Pollen mother cells disorganized while tapetal layers developed normally. (b)Both pollen mother cells and tapetallayers disorganized.(c)Pollen mother cells fused with tapetal cells to form pesiplasmodium and then disorganized. Anthers both in (a) and (b) have hypertrophic middle layers. The develoment of tapetal cells was found to be normal in the anther with abortive pollen,but not in the anther without pollen. Since the pollen mother cells in the anther without pollen disorganized simultaneously with or even before the disorganization of the tapetal cells, it seems that the abnormal development of tapetal cells can not be attributed as the cause of pollen abortion. The conception that inadequate differentiation of vascular bundles in male-sterile anther leads to pollen abortion is not supported in this investigation.

“蚰包”小麦不育系的花药为1至4室,药室数减少,部分地是由于药室合并的结果。花药、花粉发育可分为败育型及无花粉型。败育型的减数分裂正常,花粉停滞在单核靠边期或在单核期败育;无花粉型的花粉母细胞在减数分裂前败育,其药壁中层有肥大生长现象。本观察结果,难以说明毡绒层异常为花粉败育的根源,花粉败育与药隔维管束亦无关。

In present work, the development of anther, formation of pollen grain and development of ovule and formation of embryo sac in Ramie were observed. It was found that there were following eharacteristics with respect to embryology of Ramie. 1. Besides tetradymous, there were also bibocular anthers. 2 .After the maturation of anther, only one layer of epidermal cells was remained in the wall of pollen sac, and the rest layers disappeared. 3 .Meiosis of pollen mother cells were characterized...

In present work, the development of anther, formation of pollen grain and development of ovule and formation of embryo sac in Ramie were observed. It was found that there were following eharacteristics with respect to embryology of Ramie. 1. Besides tetradymous, there were also bibocular anthers. 2 .After the maturation of anther, only one layer of epidermal cells was remained in the wall of pollen sac, and the rest layers disappeared. 3 .Meiosis of pollen mother cells were characterized as simultaneous style. Pollen grains were arranged in tetrahedral form. Each matured pollen grain with three germ pores dispersed out from the pollen sac in bisporous form. Under natural condition more abortive pollen grains occurred. 4. Ramic is a kind of plant with basal placenta, and erect ovule. Spo= rogonium could directly developed into embryo sac mother cell. 5. The development of the embryo was classified as polygonum type, but the antipodal cell disappeared very early.

本工作对苧麻花药的发育和花粉粒的形成、胚珠的发育和胚囊的形成进行了观察。发现苧麻在胚胎学方面,有如下特别之处:花药除具四室的花药外,还有具二室的花药;花药成熟后,花粉囊壁仅为一层表皮细胞,其余各层细胞概行消失;花粉母细胞的减数分裂属同时型,花粉粒在四分体中按四面体形排列,成熟的花粉粒呈球形,具三个萌发孔,以二胞状态从花粉囊中散布出来,但在自然条件下产生败育的花粉粒比率较高;苧麻属底着胚座,直生胚珠,孢原细胞不经过分裂可直接发育形成胚囊母细胞,胚囊的发育属蓼型,但反足细胞消失很早。

1 . Through smear slides, meiosis of Chinese sacred lily (Narcissus tazetta var. Chinensis Roem. ) is found to be obviously irregular and unbalanced.2. Observations on development of the pellcn grains prove that abortive pollens are formed from microspores with micronuclei, while micro-spores without micronuclci continue to develope into normal functional pollens. The microspores without micronuclei do not have to same chromosome constituent, their development is not synchronous, and no stargh accumulated...

1 . Through smear slides, meiosis of Chinese sacred lily (Narcissus tazetta var. Chinensis Roem. ) is found to be obviously irregular and unbalanced.2. Observations on development of the pellcn grains prove that abortive pollens are formed from microspores with micronuclei, while micro-spores without micronuclci continue to develope into normal functional pollens. The microspores without micronuclei do not have to same chromosome constituent, their development is not synchronous, and no stargh accumulated in them. By artificial germination the pollen shows a rather low percentage (30<%) .

1.查明中国水仙花粉母细胞在减数分裂过程中表现了明显的不规则、不均等现象。2.观察了花粉粒的发育和人工萌发情况。表明含有微核的小孢子最后形成败育花粉粒。不含微核的小孢子则继续发育,但它们的染色体组成不完全一致,发育不同步,不积累淀粉,发芽率低(<30%)。最后对中国水仙高度不育的主要原因提出意见。

 
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