专化的

Based on the above results, we suggest that selective changes of low-copy sequences occur rapidly after polyploid formation, which may contribute to the differentiation of chromosomes in newly formed allopolyploid wheats.

认为这些低拷贝的染色体专化序列对于多倍体形成后部分同源染色体之间的进一步分化起着重要作用。

Our results also discovered that there were two host preference biotypes of the aphid Aphis gossypii and the related behavioral mechanism was discussed in detail.

实验结果还证明了蚜虫在两种不同的寄主植物上形成了特定的取食专化型。

Experimental results based on backcross population indicated that the sensitivity and specificity of PCR marker were almost as same as that of RFLP marker.

回交后代的鉴定结果表明，该PCR标记的灵敏度和专化性与RFLP标记基本相同。

By chromosome microdissection, were characterized.

中分离的5个7B染色体专化DNA序列的特性进行了研究。

Banana Fusarium wilt disease is one of the External Quarantine Disease,it is one kind of Systemic vascular disease caused by Fusarium oxysporum f.sp.cubense,it also named Panama disease、Chlorosis.

香蕉镰刀菌枯萎病是一种对外检疫性病害，是由尖孢镰刀菌古巴专化型(Fusarium oxysporum f.sp.cubense)侵染引起的维管束系统性的病害，又称巴拿马病、黄叶病。

Tricholoma may be a paraphyletic genus two. The collections identified as T. caligatum is a mixture. Some parts of them from France are members of T. matsutake, the other parts from North America are closed to T. bakamatsutake and T. fulvocastaneum. Tricholoma robustum and T. focale form a clade which is obviously a sister group of the stirp Subannulate. The stirp Caligata was defined as a group mainly on the basis of the predominant veil. But from the result of molecular systematic analysis, the presence of veil is not a stable character in the matsutake group. Species having symbiosis with conifers and broad leaf tree are all transformed from those whose host specificity is not strict. The phylogenetic tree based on ITS sequences resembled the tree of NJ algorithm based on cladistic coding. In the phylogenetic tree based on morphylogical characters, T. zangii and T. bakamatsutake form a clade, but it is the result of convergent evolution as suggested by molecular analyses. The distribution area of the matsutake group can be divided into six regions: middle and northern Europe region, Mediterranean region, Hengduan Mount.— Southeastern Tibet region, Northeastern China—Japan—Far-east Russia region, the Atlantic—North America region and the Rocky Mountain region. The abundance center of the matsutake group are Hengduan Mount.—Southeastern Tibet region and the Rocky Mountain region. Hengduan Mount.

松口蘑群的分子系统学研究得出的结果有：由于粗壮口蘑和羽衣口蘑明显和亚环族(Tricholoma，section subannulate)的种类是来自同一个谱系，和其它松口蘑群的种不具有最近共同祖先，因此松口蘑群是一个多系群；松口蘑群和口蘑属其他种类的亲缘关系比和蜜环菌属更接近；梭柄松苞菇和松口蘑群的差距明显小于油黄口蘑(T.flavovirens)和棕灰口蘑；口蘑属是一个多系群；鉴定为欧洲口蘑的标本明显不是一个单系群，其中一部分是松口蘑，另一部分和黄褐口蘑及傻松口蘑(T.bakamatsutake)比较接近；划分松口蘑群的标准是菌环的存在，但从分子系统学的结果来看，菌环的存在与否并非是一个很稳定的性状；和针叶树专性共生及和阔叶树专性共生均由寄主专化性不强的种类转化而来；在形态学系统发育树上青冈口蘑和傻松口蘑被聚为一个分枝，分子系统学的研究结果表明，这是趋同进化的结果；用支序方法编码作出的NJ树的结果更接近ITS序列的结果。

Bemisia tabaci Gennadius (Homoptera: Aleyrodidae) is a worldwide agriculturalpest. It is an omnivorous insect which has a very broad host range and complicatedhost-preference biotypes from different populations.

烟粉虱Bemisia tabaci Gennadius隶属同翅目、粉虱科、小粉虱属，其食性杂、寄主范围广，并存在复杂的寄主专化现象，是一种世界性的农业害虫。

Interspecific hybridization offers a special opportunity to understand the genetic basis of host plant specialization in phytophagous insects and the biological causes of Haldane's rule.

种间杂交是研究植食性昆虫食性专化的遗传机制和霍尔丹定律生物学基础的主要途径。

Carrot slices may also be used to bait the fungus from soil (Yarwood, 1946), though carrots arenot completely species-specific; C. moniliformis, Thielaviopsis basicola, Fusarium species, bacteria, and others will grow on the carrots.

胡萝卜薄片同样可以从土壤中饵集真菌(Yarwood， 1946)，可是胡萝卜不能诱集种的各个专化型； C.moniliformis， Thielaviopsis basicola， Fusarium，细菌以及其他微生物将生长在胡萝卜上。

The selective behaviour, fitness, cause formation and population differentation of the cotton aphid''s host biotype were studied on this project. The results showed that the cotton and cumbrits biotype aphid were existed in natural population in Nanjing .

本项目研究了南京地区棉蚜对寄主的选择与适应性、寄主专化型的成因、寄主专化型蚜在DNA水平上的多态性及棉蚜迁飞特性的种群分化、迁飞型种群的遗传响应与杂交遗传。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。