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abnormal pollens
相关语句
  异常花粉
     About 29.9 percent of the abnormal pollens undergo extra divisions in vivo and multinucleate pollen grains were formed.
     在异常花粉中,约有29.9%的细胞发生核的超额分裂,即形成具3~5核的多核花粉。
短句来源
     equal and unequal divisions. According to Feulgen reaction of its daughter nuclei and whether they participate in the formation of multicellular pollen or not,we distinguished four basic types of the abnormal pollens, i.e.type A,B.C and D. C and D are the types in which their generative nuclei were involved in the formation of multicellular pollen.
     根据其子核对Feulgen 反应的性质及其参与多细胞花粉的形成与否,可将异常花粉分为 A、B、C 和 D 四种基本类型,其中 C 和 D 是有生殖性细胞参加花粉胚构成的类型。
短句来源
  “abnormal pollens”译为未确定词的双语例句
     Numerous different sized and abnormal pollens were spread from the tetrads of 10day development。
     第10天的四分孢子中散出大量大小不齐、畸形花粉。
短句来源
     The abnormal pollens (>98% of total pollens observed) in G. barthei and low pollen viability in G. schomburgkii ((<12%)) may be ascribable to no seed-set.
     花粉败育(毛舞花姜)或花粉活力低(双翅舞花姜,花粉萌发率<12%)可能是这2种植物不能结实的主要原因。
短句来源
     31.3% tested pollen grains from transgenic plants exhibited abnormal shape; Only a portion of the pollen grains from transgenic plants were of vigor,and 31.6% of the pollen grains from transgenic plants germinated normally; The PME activity of the anther from the plants with abnormal pollens was decreased by 12.8%.
     研究发现,31.3%菜心转基因植株花粉表现出畸形,而且只有部分花粉具有活力,花粉离体萌发率降低为31.6%,其花药果胶甲酯酶活性降低了12.8%.
短句来源
     The pollen grains from approximately 50% of RNAi plants exhibited abnormal shapes,and only 32.3% of pollens from RNAi plants germinated normally. The PME activity of the anther from RNAi plants with abnormal pollens decreased by 13.5%.
     50%转基因菜薹植株的花粉畸形,花粉离体萌发率为32.3%,出现畸形花粉植株的花药PME活性降低了13.5%。
短句来源
  相似匹配句对
     Abnormal Climate
     气候乱象
短句来源
     Abnormal Labor
     异常分娩
短句来源
     Numerous different sized and abnormal pollens were spread from the tetrads of 10day development。
     第10天的四分孢子中散出大量大小不齐、畸形花粉。
短句来源
     Studies on Abnormal Meiosis Producing 2n Pollens in Nonastringent Persimmon(Diospyros kaki Thunb.)
     ‘禅寺丸’甜柿2n花粉形成机制的研究
短句来源
     30% for polyvalent pollens.
     夏秋花粉占30%,
短句来源
查询“abnormal pollens”译词为用户自定义的双语例句

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  abnormal pollens
At stage 14, mutantses produced abnormal pollens, and the anther wall was collapsed and crumpled; furthermore, some cavities were also found under the epidermis.
      


The conditions for inducing pollen embryoids and calluses and the cytological observations of androgenesis in wheat have been studied.Results are summarized as follows: 1.N_6 medium is apparently superior to MS medium for inducing pollen cal- luses.It is shown that the exogenous hormones are not necessary to initiate the androgenesis,but they can promote further growth of pollen embryoids and calluses. 2.The pathways of the androgenesis have been also investigated with the total- mount of the...

The conditions for inducing pollen embryoids and calluses and the cytological observations of androgenesis in wheat have been studied.Results are summarized as follows: 1.N_6 medium is apparently superior to MS medium for inducing pollen cal- luses.It is shown that the exogenous hormones are not necessary to initiate the androgenesis,but they can promote further growth of pollen embryoids and calluses. 2.The pathways of the androgenesis have been also investigated with the total- mount of the anther.The asymmetric and symmetric divisions in uninucleate micros- pores all can initiate embryogenesis,but the former is more frequent. 3.The micronuclei cleft from chromosome fragments,have been found both in multicellular pollen and in some albino pollen plants.It is deduced that the albino and abnormal pollen plants may originate from the multicellular pollen which con- tain micronuclei. 4.Both the endoduplication of the nucleus and fusion of free nuclei of pollen are believed to be the main causes for the production of the diploid and multiploid pollen plants.

本工作对小麦花粉胚和愈伤组织的诱导条件和雄核发育的细胞学现象作了研究。结果如下:(1)N_6培养基诱导花粉愈伤组织的效果显著优于 MS 培养基。外源激素对于雄核发育的启动不是必需的,但对愈伤组织进一步的生长却是不可缺少的。(2)用花药整体制片法研究了雄核发育的各种途径,结果表明,不均等分裂和均等分裂的小孢子都能形成花粉胚,但前者占较大比例。(3)在部分多细胞花粉和白化苗中观察到染色体断片和微核,推测白化或畸形的花粉植株可能起源于具微核的花粉。(4)细胞的核内再复制和游离核的融合是产生二倍体和多倍体花粉植株的重要原因。

The microspore mother cell meiotic process in Paeonia lactiflora cv. "Ca-Fu-Gui" as a rule, is normal, but some abnormal phenomena are not infrequent. The author observed that anthers contained dimorphic pollen grains, i. e. normal and abnormal pollen grains were 75.8%, 24.2%, respectively.About 29.9 percent of the abnormal pollens undergo extra divisions in vivo and multinucleate pollen grains were formed. Ex-perimental results of artificial germination of pollens showed that the germination...

The microspore mother cell meiotic process in Paeonia lactiflora cv. "Ca-Fu-Gui" as a rule, is normal, but some abnormal phenomena are not infrequent. The author observed that anthers contained dimorphic pollen grains, i. e. normal and abnormal pollen grains were 75.8%, 24.2%, respectively.About 29.9 percent of the abnormal pollens undergo extra divisions in vivo and multinucleate pollen grains were formed. Ex-perimental results of artificial germination of pollens showed that the germination rate was roughly 36.5%, whereas the abnormal grains failed to germinate.

栽培芍药‘大富贵’品种的小孢子母细胞减数分裂过程基本上是正常的。但也存在某些异常现象。作者观察到花药具二型花粉,正常花粉约占75.8%,异常花粉约占24.2%。在异常花粉中,约有29.9%的细胞发生核的超额分裂,即形成具3~5核的多核花粉。花粉的人工萌发试验结果,其萌发率约为36.5%,异常花粉不能萌发。

1. There are two types of stamens.The fertile produces normal pollengrains and then splits,while the sterile produces abnormal pollen grains anddoes not split.The great mass of normal pollen grains make pollinationpossible. 2. The chalazal megaspore of a linear or T-shaped tetrad develops in aPolygonum type of embryo sac. 3. Pollen tube enters into the ovule through micropyle(porogamy). 4. The embryogeny conforms to the "Onagard type". 5. The "cotton" of the seeds develops from the epidermal...

1. There are two types of stamens.The fertile produces normal pollengrains and then splits,while the sterile produces abnormal pollen grains anddoes not split.The great mass of normal pollen grains make pollinationpossible. 2. The chalazal megaspore of a linear or T-shaped tetrad develops in aPolygonum type of embryo sac. 3. Pollen tube enters into the ovule through micropyle(porogamy). 4. The embryogeny conforms to the "Onagard type". 5. The "cotton" of the seeds develops from the epidermal cells of theplacenta. 6. A schedule of time in relation to reproductive phase is given.

在人工授粉条件下,观察了小叶杨有性生殖过程的形态发育及其持续时间,结果如下:除正常花粉外,有异常和败育花粉,但不影响传粉和受精。胚珠倒生,单珠被,厚珠心,蓼型胚囊,珠孔受精,核型胚乳,胚的发育属柳叶菜型,种缨由胎座表皮细胞发育而成,柱头属湿型,花柱是实心的。人工授粉后4小时,花粉粒90%以上萌发,授粉后48小时,花粉管到达胚囊,双受精作用发生在授粉后3—6天,胚乳游离核时期持续约15—18天,但从胚乳游离核到胚乳细胞全部形成只需2—3天,合子“休眠”6—10天,原胚期约10天,心形期和鱼雷期各约2天,幼胚后期发育迅速,胚体由占种子内全长的1/3至充满整个种子只需5—6天。从授粉到种子成熟,历时约一个月。

 
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