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三倍体无性系
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  triploid clones
     From 9:00 to 11:00 in the clear day,the triploid clones ZH6 and B346 evaded strong light by changing in azimuth angle.
     晴天上午 9:0 0~ 1 1 :0 0 ,三倍体无性系 ZH6和 B3 4 6通过方位角运动来避免强光胁迫。
短句来源
     Both the maximal and effective PSⅡ efficiencies of the diploid clone B11 were much higher than those of the two triploid clones B346 and B342. The non_photochemical quenching of triploid B346 was higher than in the B342 and B11 clones.
     二倍体无性系B1 1的光系统Ⅱ最大光化学效率(Fv/Fm)及实际光化学效率[(Fm′ -F)/Fm′]高于两个三倍体无性系B346和B342。
短句来源
     The within tree photosynthesis and the net photosynthetic rate were studied in 20 Populus tomentosa clones, including 14 triploid clones and 6 diploid clones.
     该文对 14个毛白杨三倍体无性系和 6个二倍体无性系盆栽苗的光合垂直变化和功能叶净光合速率进行了测定 ,对光合指标与生长的相关性进行了分析 . 结果表明三倍体无性系和二倍体无性系的光合垂直变化基本趋势相似 ,但在光合速率的波动幅度上存在着差异 .
短句来源
     The triploid clones were more sensitive to light induction than that of diploid clones in the movements of leaf and chloroplast.
     三倍体无性系对光诱导的敏感程度要高于二倍体无性系
短句来源
     Around midday hours light evasion movements could be achieved by changing midrib angle,declining leaf tilt downwards for triploid clones ZH6 and B346 and maintaining leaf blade erected for diploid clone B11.In other daytime all clones optimize in interception of solar irradiance by changing both of midrib angle and lamina angle.
     各无性系主要通过方向角和悬挂角的变化来调节获得最佳太阳辐射 ,在中午受到强光胁迫时存在明显的“避光运动”。 三倍体无性系和某些二倍体无性系在避光运动方式上是不同的 ,三倍体无性系 ZH6和 B3 4 6采用叶片下垂形式 ,而二倍体无性系 B1 1则采用叶片竖立方式。
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  triploid clone
     The oxygen evolution, thermal dissipation, and photochemical energy storage of three hybrid poplar clones, namely the triploid clone B342, the diploid clone B11 [(Populus alba×P. glandulosa)×(P.tomentosa×P.bolleana)], and the triploid clone B346 [(P.tomentosa×P. bolleana)×(P. alba×P.glandulosa)], under light stress were studied using photoacoustics.
     以光声光谱技术对经不同光强预处理的 3个杂种杨无性系即三倍体无性系B34 2、二倍体无性系B1 1[(Populusalba×P .glandulosa)× (P .tomentosa×P .bolleana) ]和三倍体无性系B34 6 [(P .tomentosa×P .bolleana)×(P .alba×P .glandulosa) ]的光合放氧、光声热信号及光化学能量贮藏进行测定。
短句来源
     The results show that the morphological characters of triploid clone ZH4 are larger than that of diploid clone BL1,but the density of the two clones is reverse.
     结果表明:三倍体无性系在气孔形态指标上比二倍体无性系大,但密度相反。
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  “三倍体无性系”译为未确定词的双语例句
     The giant quality of 989 was very obvious through morphology and microscope observation.
     经形态及显微结构观察比较,989的巨大性十分明显。 染色体镜检表明其体细胞染色体数大于50条,是一个很有前途的三倍体无性系
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  triploid clones
In order to improve wood properties of triploid clones of Populus tomentosa, urea-formaldehyde (UF) resin was compounded with nano-SiO2, coupling agents and flame retardants in different ways to prepare five kinds of modifiers.
      
Nuclear genome size variation was studied in Musa acuminata (A genome), Musa balbisiana (B genome) and a range of triploid clones differing in genomic constitution (i.e.
      
Mitotic configurations from gill epithelial cells show 46 chromosomes for the diploid fishes, but 69 chromosomes for members of the triploid clones associated with P.
      
Demonstration of cytogenetic criteria by which females from triploid clones may be clearly distinguished from sympatric diploid specimens of P.
      
Cytogenetics of triplet conjugation in Tetrahymena: Origin of haploid and triploid clones
      
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  triploid clone
One triploid clone showed partial female fertility when crossed to hexaploids, self-pollinated, or intercrossed with other triploids.
      
In the F1 of one cross a triploid clone with the autosomal 1,3 translocation was obtained.
      


This paper reports the advances of allotriploid of Populus tomentosa in China.Combining chromosome doubling with interspecific hybridization and pollen radiation, the authors have successfully screened 20 allotriploid clones of backcross hybrids ((P. tomentosa × P. bolleana) × P.tomentosa). Stem volume of the best clone(B301) surpassed 0.36m3 per tree (19.9m in height and 24.1cm in diameter) in an 8 years old plantation at 3×3m spacing, which is 255% over the local diploid counterpart....

This paper reports the advances of allotriploid of Populus tomentosa in China.Combining chromosome doubling with interspecific hybridization and pollen radiation, the authors have successfully screened 20 allotriploid clones of backcross hybrids ((P. tomentosa × P. bolleana) × P.tomentosa). Stem volume of the best clone(B301) surpassed 0.36m3 per tree (19.9m in height and 24.1cm in diameter) in an 8 years old plantation at 3×3m spacing, which is 255% over the local diploid counterpart. It is demonstrated that the genetic composition of the breeding materials and breeding methods are essential to the expected genetic gains.Plustree selection from diploids can only generate 45% gain, while backcross hybrid selection from diploids and allotriploids(B301) can generate 155% and 255% gain respectively. It is clear that choosing the proper material and method is the key to the breeding success of Populus tomentosa.

本文报道了毛白杨三倍体育种的研究进展.应用染色体加倍、种间杂交和花粉辐射技术,成功选育出了20个回交杂种异源三倍体无性系,最优三倍体无性系8年生单株材积达到了0.36m3,超过一般二倍体的2.55倍.由此表明,育种材料的遗传组成和育种方法是获得较高遗传增益的基础.二倍体选种增益一般为45%,回交杂种增益为155%,而异源三倍体最优无性系的增益为255%.

Although the natural triploids, the giant forms of poplar in volume growth have been found in a few species of genus Populus in many countries in the world, the work of natural triploids of indigenous tree of poplar species in China has not been done until the national program of poplar breeding was established since 1983.The national program selection and breeding of triploids of Populus tomentosa has being conducted by group of professors in Beijing Forestry University for over 15 years (1983-1997). As...

Although the natural triploids, the giant forms of poplar in volume growth have been found in a few species of genus Populus in many countries in the world, the work of natural triploids of indigenous tree of poplar species in China has not been done until the national program of poplar breeding was established since 1983.The national program selection and breeding of triploids of Populus tomentosa has being conducted by group of professors in Beijing Forestry University for over 15 years (1983-1997). As the breeding strategy of triploids of Populus tomentosa, the Populus tremula and Populus tremuloides were firstly followed. Research started with natural triploid selection from stands, observation of larger 2n pollen, and the artificial induction of triploids of Populus tomentosa by colchicine treatment. So far the results of these three mentioned aspects were obtained. In this paper the observation of 2n pollen and selection of natural triploids of Populus tomentosa were summarized. By pollen observation and chromosome accounting of Populus tomentosa, the results indicate: (1)There are larger pollen grains in the natural spectrum of pollen of Populus tomentosa the diameter of larger pollen varies from 35~45μm, they cover 39% of total pollen with 38 chromosomes (1n=2x=38), which proves the larger pollen grains to be unreduced 2n pollen, and the smaller pollen wth 19 chromosomes (1n=1x=19), are normal haploid pollen; (2)The natural triploids (2n=3x=57) of Populus tomentosa are existed in the distribution area of P.tomentosa. So far 5 clones of natural triploids of Populus tomentosa have been found, which distribute in northern, western, and southern parts of its distribution area, and they separated very far each from other. It shows, the existence of natural triploids of Populus tomentosa has universality; (3)The volume growth, fiber length, stem pattern and resistance to pest of natural triploids of Populus tomentosa are much better than the productive colony. The average genetic gain for volume growth of 5 natural triploids exceed 564% over the control; the best clone among the natural triploids, the B383 exceed 154% over the control. The discovery the selection and utilization of these natural triploids of Populus tomentosa is very important for both pulp and timber production and also for academic research of forest tree breeding. Today a large scale of cultivation of these best natural triploids of Populus tomentosa has been spread up through the north part of China.

对毛白杨优良无性系进行了染色体检查和花粉观察,结果表明:(1)在毛白杨自然花粉中有形态较大的大花粉粒的存在,大花粉粒染色体计数为1n=2x=38,证明这种大花粉粒为天然染色体未减数的2n花粉;(2)毛白杨分布区中有天然三倍体(2n=3x=57)的存在。现已检出5个毛白杨天然三倍体无性系,它们分别位于毛白杨分布区的北部、西部与南部,相距甚远,表明其存在具有普遍性;(3)毛白杨天然三倍体在材积生长、纤维特性、干型和抗性等方面具有优势,与生产群体相比,其材积生长的遗传增益平均超出564%,其中表现最佳的B383可超出154%。这些毛白杨天然三倍体的发现,对于杨树遗传育种的学术研究和毛白杨木浆、木片的产业化利用等具有重要意义,显示了毛白杨三倍体的巨大开发潜力和栽培价值。

The stomatal morphological characters,distribution,diurnal course,and nonuniform stomatal closure were studied by using a combination of scanning electron micrography and gas exchange after fixing leaf samples in liquid nitrogen.The results show that the morphological characters of triploid clone ZH4 are larger than that of diploid clone BL1,but the density of the two clones is reverse.Clone ZH4 is more sensitive to the change of environmental factors than clone BL1.The authors suggest a formula for modifying...

The stomatal morphological characters,distribution,diurnal course,and nonuniform stomatal closure were studied by using a combination of scanning electron micrography and gas exchange after fixing leaf samples in liquid nitrogen.The results show that the morphological characters of triploid clone ZH4 are larger than that of diploid clone BL1,but the density of the two clones is reverse.Clone ZH4 is more sensitive to the change of environmental factors than clone BL1.The authors suggest a formula for modifying computation of Ci value (intercelluar CO_2 concentration)in photosynthesis.

采用液氮现场固定叶样,扫描电镜直接观察(照相)结合气体交换测定白杨派2个新无性系气孔形态、分布、日变化、导度及非均匀关闭等情况。结果表明:三倍体无性系在气孔形态指标上比二倍体无性系大,但密度相反。无性系ZH4的气孔对环境的敏感程度比无性系BL1大。依据气孔开度的平均值和标准差,笔者提出一个修正叶光合过程中计算叶肉细胞间CO2浓度值的公式。

 
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