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Mechanism of 2n pollen occurring in Chinese white poplar. 毛白杨未减数2n花粉发生机制的研究
Thecolor of sapwood of Chinese white poplar among trees has significant difference. 毛白杨边材材色株间存在显著差异。
Especially,the survival ratio of shoot cuttage(96.4%)was higher than the Chinese white poplar(38.2%). 该嵌合体扦插成活率远高于毛白杨（38.;2%25），达96
In Beijing area,it is very difficult to roise seedlings of Chinese white poplar from seeds due to their abortion. 在北京地区,由于毛白杨种子败育,因而以播种的方法获得实生苗非常困难。
The extract of Chinese white poplar root was used to treat the seeds of soybean,corn,wheat,peanut and weeds. 用毛白杨根系提取液处理大豆、玉米、小麦、花生和常见田间杂草的种子,进行发芽试验,研究毛白杨是否存在他感作用。
Species whith strong resistance such as I 69/55,I 72/58 and Chinese white poplar show high values in the three index. 田间表现抗病的品种 ,如 I-69/5 5、I-72 /5 8和毛白杨 ,其上述三项指标高 ;
The sun (2) new breakthrough of project of development of implementation triploid Chinese white poplar. 太阳（2）实现三倍体毛白杨开发工程新突破。
Antisense CCoAOMT cDNA and 4CL cDNA had been transformed into triploid Chinese white poplar mediated by Agrobacterium tumefaciens. 通过农杆菌(Agrobacterium tumefaciens)介导，将反义CCoAOMT cDNA和4CL cDNA转入三倍体毛白杨。
The results of PCR and PCR-Southern conformed that the transgenes had integrated into the triploid Chinese white poplar. PCR，PCR-Southern检测证实，外源基因已整合到三倍体毛白杨基因组中。
The seedlings arised from shoot crttage consisted of three types:Chinese white poplar similitudes (88%),simon poplar(2.6%)and chimera(9.4%). 扦插成苗后发生分离，其中88%25为类似毛白杨，2.;6%25为杂杨，9
In this study, antisense CCoAOMT cDNA were transformed into triploid Chinese white poplar mediated by Agrobacteriumtumficense. 通过农杆菌介导法，将反义表达载体APCoA转化三倍体毛白杨。
Transformed plant of triploid Chinese white poplar was confirmed by the shape characteristic, agropine analysis, PCR analysis. 分别从形态特征差异、PCR检测、冠瘿碱检测三个方面对三倍体毛白杨转化植株进行了鉴定。表明Ri质粒的T-DNA已整合进再生植株中。
Proved by the experiment the regeneration rate of Chinese white poplar of triploid reach 20% by this optimum regeneration system . 经实验证明，该系统对三倍体毛白杨的诱导再生率达20%25。
The lignin content of transgenic triploid Chinese white poplar (Populus tomentosa Carr.) expressing the antisense 4CL (4-coumarate: CoA ligase) cDNA was remarkably reduced. 将反义4CL(4-香豆酸辅酶A连接酶;4-coumarate: CoA ligase)基因转入三倍体毛白杨(Populus tomentosa Carr.;)
The chemical compositiofiber configuration of triploid Chinese white poplar and their influences on the quality of pulp and paper are also discussed in the paper. :同时对三倍体毛白杨的化学成分、纤维形态及其对浆纸质量的影响进行了阐述。
The nutritional components (such as protein,fat,diet fiber,amino acid,mineral element and vitamin etc.)of Chinese White Poplar male anthotaxy were analysed and determined. 对毛白杨雄花序的蛋白质、脂肪、膳食纤维、氨基酸、矿质元素、维生素等营养成分进行了分析测定,并与常用饲料的营养成分进行比较。
Stock cutting of Chinese white poplar were difficulty strike root by common seedlings method. Its survival rate was low. Survival rate might be 76.5% by Chinese white Poplar buds grafting Cathay Poplar. 毛白杨采用常规扦插育苗插穗难生根;成活率低;采用毛白杨芽接青杨成活率可达76.;5%25;采用的芽接扦插、地膜扦插和埋条育苗方法对比试验;结果显示芽接扦插效果最好;可以推广生产。
The optimized condition for transformation triploid Chinese white poplar were co-cultured for 2 days and infected 10-15minutes with Agrobacterium concentration of OD600=0.3. It is benefit to obtain kmr shoots in the coculture medium without CoCl22H2O. 同时还发现共培培养基中去除微量元素的CoCl_22H_2O，转化频率由2.;9%25升高到6
The results showed that the mixture of the CCC and CZC had effective resistance to white rot fungi(Coriolous versicolor)for Chinese white poplar with an effect equivalent to that of CCA. 结果显示复配后的MCMC,提高了其对木材白腐菌的耐腐能力,防白腐效果与CCA相近。
Following is the major related progresses. 1 Using RT-PCR technique, two cDNAs encoding caffeic acid O-methyltransferase (COMT) and caffeoyl Co-enzyme A O-methyltransferase (CCoAOMT) had been cloned from Chinese white poplar. 以下为本研究已取得的相关研究进展：1 通过RT-PCR技术，从毛白杨中克隆了木质素生物合成的两个相关酶的cDNAs，它们分别为咖啡酸甲基转移酶（caffeic acid O-methyltransferase，COMT）和咖啡酰CoA甲基转移酶（caffeoyl Co-enzyme A O-methyltransferase，CCoAOMT）。