抗病毒素

In this study, an attempt is made to account for the observed difference in the susceptibility of Gossypium hirsutum L.(cv. BD-18 and Simian 3, resistant and susceptible to V. dahliae, respectively) to toxin of Verticillium dahliae, by looking for differences in the timing and level of production of NO and H_2O_2, and their effects on the expression of GST gene.

本实验以棉花抗病品种BD-18和感病品种泗棉三号的悬浮细胞为材料，研究了棉花细胞在黄萎病菌毒素处理后H_2O_2和NO的变化，并用半定量RT-PCR的方法检测毒素、H_2O_2和NO对棉花谷胱苷肽-S-转移酶基因转录水平的影响。

This is the first report of in vitro screening using phytotoxin for disease resistance in rice.

本文是以植物毒素作为筛选因子，运用组织培养技术，在水稻上成功地筛选出抗病植株的首次报道。

Under the selection pressure of crude toxin filtration, three kinds of treatment methods and four kinds of phytotoxin concentrations were used to screen the blast-resistant callus phenylalanine, The result indicated that the crude toxin filtration inhibited evidently the callus induction, subculture and differentiation, with the increasing of the toxin concentration, the inhibiting getting enhanced.

以稻瘟病病原菌粗毒素提取液为选择压，对水稻进行抗病性筛选，结果表明：粗毒素提取液对水稻愈伤组织诱导、继代及分化有明显的抑制作用，抑制程度随毒素浓度提高而增强，且品种间差异显著。

From the results of our studies we deduced that sucrose itself in the pith tissue of corn stalk could rule as a represser in someway to suppress the pathogen producing enzyme or toxin which can destroy host cells, or it could destroyor inactivate the enzyme produced by the pathogen, or it was not suitable for toxin surviving in it.

同时，从研究结果我们推断蔗糖本身可能具有阻遏镰刀菌产生酶类或毒素作用，病菌在侵染抗病品种过程中可能因寄主组织中蔗糖含量高，而导致病菌产生的可破坏寄主细胞组织的酶类受到阻遏或活性受到钝化；或者蔗糖不利于致病菌毒素的存活。

HT-toxin, which produced by Exserohilum turcicum, is not only a major toxigenic factor but also the elicitor to stimulate the defensive reaction of corn.

对HT-毒素的研究，将有助于研究玉米大斑病菌引发玉米抗病/感病的分子机制。

At the same time, we measured the dimesion of the leaf spot and determined the changes of PAL activities.

并分别用这三种组分的低浓度溶液处理玉米叶片后再接高浓度毒素观察其病斑大小并测定了与抗病相关的关键酶PAL活性变化。

Tobacco of China,3:44-47[13]Alvarez M.E., Penell R.I.,Meijer P.J., Ishikawa A., Dixon R.A. and Lamb C.1998.Reactive oxygen intermediates mediate a systemic signal network in the establishment of plant immunity.Cell,92:773－784

已知H2O2是活性氧的典型代表，因此，我们推测，AT-毒素诱导的烟草对TMV的抗性，可能是由于毒素诱导的HCD激活了SAR通路，从而实现了抗病性，详细机制还在进一步研究。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。