杂种

These DNA sequence changes might contribute to the rapid evolution of the newly formed allopolyploid and allow the divergent genomes to act in harmony.

杂种后代DNA序列的这种变化可能有利于新形成异源多倍体小麦的快速进化、遗传协调和遗传稳定性。

Thus we know, withthe alternation of generations, the descendant of pollen plant does not produceboth deterioration or separation and reversed rotation of fertility.

实践证明，应用粳稻花粉植株进行育种是可行的，它能迅速稳定杂种后代和有较高的选择效率。

Since microspore mother cells showabortion during the first meiotic divison,it is suggested thatthe early male abortion is frequently associated with variousdegrees of impairment to the fertility to the female〓amate.

研究的27个杂种第一代中，有11个组合的产量超过对照或与对照持平，占总组合数的40.74%。在强优势组合中，不育细胞质带来的负效应不足以使F1产量的显著降低，而且通过杂优补偿作用可比对照有所提高。

Studies on sequence changes in the early genomes of interspecific F_1 hybrid and amphidiploid in CucumisIn the present study,extensive genomic changes were detected in newly obtained allotetraploid of Cucumis,namely Cucumis hytivus Chen and Kirkbride,by AFLP analysis using 12 pairs of EcoR-I/Mse-I primers.

甜瓜属远缘杂种F_1及人工异源双二倍体早期基因组序列变化研究利用12对Eco RI/Mse I选择性引物，对甜瓜属人工异源双二倍体C.hytivus及其二倍体父母本进行AFLP分析，结果发现多倍体基因组在形成早期发生了广泛的序列变化。

The chromosome constitution on H96276-2, which is a stable line derived from a sterile wheat-Agropyron intermedium partial amphiploid Zhong 3 cross to common wheat Hui 75, was analyzed by sequential GISH and FISH.

利用顺序基因组-重复序列原位杂交技术对1个来自中3不育系和普通小麦恢75杂种后代稳定株系H96276-2的染色体组成进行了分析。

The chromosme constitution on H96276-2, which is a stable line derived from a sterile wheat-Agropyron intermedium partial amphiploid Zhong 3 cross to common wheat Hui 75, was analyzed by sequential GISH and FISH.

利用顺序基因组-重复序列荧光原位杂交技术对1个来自中3不育系和普通小麦恢75杂种后代稳定株系H96276-2的染色体组成进行了分析。

It was indeed Top, a magnificent Anglo-Norman, who derived from these tworaces crossed the swiftness of foot and the acuteness of smell which arethe preeminent qualities of coursing dogs.

果然是托普，它是一只美丽的盎格鲁——诺尔曼杂种狗，由于具有这两个品种的特点，它跑得既快，嗅觉又灵。猎狗特别需要具备这种优点。

To characterize the isotype of human xenoreactive nat ural antibodies against porcine pancrease islet cells, cyostat sections of the p ancrease were incubated with the sera from 18 cases of IDDM or 20 human controls respectively, further with FITC-conjugated goat antihuman IgG or IgM secondary antibodies. IgG was found to bind to pancrease islet cells in sera from 8 cases of IDDM and 8 human controls, while IgM in 4 IDDM and 6 human controls.

为检测人抗猪胰岛细胞天然抗体的同种型，采取18份胰岛素依赖型糖尿病患者血清及20份正常人血清分别与杂种猪胰腺组织的冰冻切片孵化后，再用免疫荧光标记的羊抗人IgG、IgM单克隆抗体染色。8份IDDM血清和8份正常人血清中含有直接针对猪胰岛细胞的IgG型抗体；4份IDDM血清和6份正常人血清中含有IgM 型抗猪胰岛细胞抗体。

It was suggested that the capacities of parthenogenesis and apogamy of rice were used to obtain stable lines in early hybrid generations.And several characteristics such as apomixis,cleistogamy,superior genes of qualities and resistance to disease and pest were combined and were used to search a new pathway of selecting high yield,superior quality and heteroresistance to diseases and pest,and lead to realize the purpose of fixing heterosis by apomixis.

利用水稻的孤雌生殖和无配子生殖能力，获得早世代稳定品系，建立快速育种方法，把无融合生殖特性与闭颖授粉、优质、抗性等特性结合探索高产优质多抗育种新途径，逐步实现利用无融合生殖固定杂种优势的目的。2。

But utilization of apomixis in breeding procedure could significantly shorten time of selection and fix heterosis.

然而利用无融合生殖特性进行育种将可能大大缩短育种年限，固定杂种优势。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。