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二倍体孢子生殖
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  diplospory
     M14 beet is a monosomic addition line of Beta corolliflora Zoss which constitutes of the normal 18 B. vulgaris chromosomes plus Beta corolliflora chromosome 9. Through the investigation we found the transmission frequencies of M14 up to 96% in four generations. Our studies revealed that the reproduction mode of M14 is allium-odorum type diplospory, autonomous endospermgenesis but pollen stimulation is needed.
     甜菜无融合生殖单体附加系M14品系是通过二倍体栽培甜菜与四倍体野生白花甜菜杂交获得的异源三倍体再经过与栽培甜菜回交得到的后代,该材料经过鉴定为韭型二倍体孢子生殖的配子体无融合生殖材料,并认为无融合生殖基因定位在附加的白花甜菜染色体上。
短句来源
     The result showed that the apomictic development conforms apospory and diplospory.
     高粱SSA-1 的无融合生殖为无孢子生殖和二倍体孢子生殖两种类型。
短句来源
     The results indicated that the apomictic development conforms apospory and diplospory.
     谷子SMA-1的无融合生殖为无孢子生殖和二倍 体孢子生殖两种类型。
短句来源
  “二倍体孢子生殖”译为未确定词的双语例句
     Callose in cell walls was observed by the callose aniline-blue fluorescence during megasporogenesis in line M14,a chromosome 9 monosomic addition line of Beta corolliflora Zoss. (Beta vulgaris L.,VV+1C,2n=18+1),in which the modes of reproduction are facultative apomixis,diplosporous and sexual reproduction.
     应用脱色苯胺蓝诱导荧光法观察了甜菜单体附加系M14(Beta vulgarisL,.VV+1C、2n=18+1)正常有性生殖与二倍体孢子生殖时,大孢子发生期间细胞壁内胼胝质的变化。
短句来源
     THE CHARACTERISTICS OF APOMICTIC PDER RICE VARIETY AND THE DEVELOPMENT OF DIPLOID EMBRYO SAC
     水稻PDER品系的特点和二倍体孢子生殖胚囊的形成和发育
短句来源
     Practical Significance of Diplospories in Angiosperms in Heterosis Fixation
     被子植物二倍体孢子生殖在杂种优势固定中的实用价值探讨
短句来源
     Apomixis differs from sexual reproduction in its production of seed without nuclear fusion.
     无融合生殖是一种能代替有性生殖而不发生核融合,但能产生种子的生殖方式. 它包括:(1)二倍体孢子生殖;
短句来源
     The embryogenesis of apomixis was studied by section,the 8 nucleate embryo sac,as well as the complete process of embryo development have been observed. It was considered that the embryo sac development of allotriploid beet belonged to Antennaria type.
     利用石蜡切片研究了无融合生殖的发生过程,观察到卵细胞等8核胚囊及胚胎发育全过程,认定异源三倍体甜菜胚囊发育为蝶须型,是属于有丝分裂型的二倍体孢子生殖的无融合生殖类型。
短句来源
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  相似匹配句对
     THE CHARACTERISTICS OF APOMICTIC PDER RICE VARIETY AND THE DEVELOPMENT OF DIPLOID EMBRYO SAC
     水稻PDER品系的特点和二倍体孢子生殖胚囊的形成和发育
短句来源
     Practical Significance of Diplospories in Angiosperms in Heterosis Fixation
     被子植物二倍体孢子生殖在杂种优势固定中的实用价值探讨
短句来源
     KARYOTYPE ANALYSIS IN DIPLOID MULBERRY
     二倍体桑树的核型分析
短句来源
     ③sterile diploid;
     ③二倍体不育;
短句来源
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  diplospory
A bulk-segregant analysis was carried out to identify molecular markers linked to diplospory in T.
      
On the basis of maize RFLP probes, three restriction fragments co-segregating with diplospory were identified in one maize-Tripsacum dactyloides F1 population that segregated 1∶1 for the mode of reproduction.
      
These results support a simple inheritance of diplospory in Tripsacum.
      
Previous studies have indicated that these three apomixis elements are controlled by more than one locus in Taraxacum and that diplospory inherits as a dominant, monogenic trait (Ddd; DIP).
      
This monosomic addition line (designated M14) is characterized by diplosporic reproduction caused by the alien chromosome carrying the gene(s) responsible for diplospory.
      
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The tactics of fixing hybrids vigor of rice by apomixis are discussed in this article. Three steps of the research are posed. First, the basal demands of apomictic rice are determined. They are unsegregated offspring. Well developed endosperm, dominant nuclear gene controled obligate apomixis. There are three pathways to be obtained unsegregated offspring, i. e.diploidy spory. somatic apospory,somatic embryo derived from nucellus or integument squeezed into embryo sac and grew instead of zygot embryo. Second,...

The tactics of fixing hybrids vigor of rice by apomixis are discussed in this article. Three steps of the research are posed. First, the basal demands of apomictic rice are determined. They are unsegregated offspring. Well developed endosperm, dominant nuclear gene controled obligate apomixis. There are three pathways to be obtained unsegregated offspring, i. e.diploidy spory. somatic apospory,somatic embryo derived from nucellus or integument squeezed into embryo sac and grew instead of zygot embryo. Second, it is screened apomictic materials from cultivated rice, wild rice and their distant related species, espicially Poa and Pennisetum etc. with the apomictic character. Third, it is introduced apomictic gene into rice by conventional cross, combination of conventional cross and tissue culture method, and gene transfer technique.

本文对利用无融合生殖固定水稻杂种优势的策略进行了讨论。提出该研究可分三步进行:1.确定无融合生殖水稻的基本要求,即后代不分离,发育良好的胚乳,显性核基因控制的专性无融合生殖。其中获得不分离的后代有三条途径:二倍体孢子生殖,体细胞无孢子生殖,珠心、珠被等体细胞胚挤入胚囊取代合子胚发育;2.从栽培稻、野生稻及其远缘物种,特别是早熟禾属、狼尾草属等具无融合生殖特性的材料中挑选无融合生殖材料;3.利用常规杂交、杂交与组织培养结合以及基因转移方法向水稻引入无融合生殖基因。

Apomixis differs from sexual reproduction in its production of seed without nuclear fusion. Diplospory, generative aposporp and adventive embryony are the three kinds of apomixis capable of main taining the hybrid vigor of F1. The genetic characteristics of the generation of haploid androgenesis are stable, hence it has potential value in breeding.

无融合生殖是一种能代替有性生殖而不发生核融合,但能产生种子的生殖方式.它包括:(1)二倍体孢子生殖;(2)生殖细胞性无孢子生殖;(3)不定胚生殖等.这3种类型能固定F_1杂种优势.单倍体孤雌生殖产生的后代遗传性较纯,具有潜在的应用价值.

The Developmental process of apomictic embryo sac and embryo in a sorghum (Sorghum bicolor (L.) Moench.) line SSA 1 was observed under light micrascope, using the method of conventional paraffin sectioning.The result showed that the apomictic development conforms apospory and diplospory.The uninucleate embryo sac underwent mitotic divisions for three times to form a seven celled or eight nuclei mature embryo sac including an egg, two synergids, two polar nuclei and three antipodals.The antipodals divided...

The Developmental process of apomictic embryo sac and embryo in a sorghum (Sorghum bicolor (L.) Moench.) line SSA 1 was observed under light micrascope, using the method of conventional paraffin sectioning.The result showed that the apomictic development conforms apospory and diplospory.The uninucleate embryo sac underwent mitotic divisions for three times to form a seven celled or eight nuclei mature embryo sac including an egg, two synergids, two polar nuclei and three antipodals.The antipodals divided and multiplicated to form an antipodal mass.Moreover, aposporous multiarchesporial cells and multiple embryo sacs were infrequently observed.Without pollination, the egg divided autonomously to form a typical graminaceous mature embryo.The authors counted the apomictic sections in the whole sections and the result showed that the frequency of apomixis was 42%, indicating the facultative apomictic property in the line SSA 1.The characteristics of apomictic process in the line SSA 1 is also discussed.

经常规石蜡切片法,在光学水平观察了高粱(Sorghum bicolor (L.) Moench) SSA-1 无融合生殖的胚胎发生。高粱SSA-1 的无融合生殖为无孢子生殖和二倍体孢子生殖两种类型。两种生殖类型的单核胚囊经3 次有丝分裂形成7 细胞(8 核)的成熟胚囊,由卵细胞、2 个助细胞、2 个极核和3 个反足细胞组成。反足细胞迅速分裂增殖,形成由20—30 个细胞组成的细胞团。此外,还具有一定频率的无孢子生殖多孢原和多胚囊现象。在未授粉情况下,卵细胞自发分裂形成典型的禾本科类型单子叶胚。经切片统计表明,SSA-1 的无融合生殖频率为42% ,证明该系为一兼性无融合生殖系。文中还讨论了SSA-1 无融合生殖过程的特点。

 
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