植物和病原物的相互作用机制是有效地控制植物病害发生、危害的理论和技术依据,因而是植物病理学的重点研究领域,病原物与其植物寄主的关系实际上是一种相互制约或对立统一的关系,Flor在亚麻锈病研究中提出了著名的基因对基因(Gene for ...植物和病原物的相互作用机制是有效地控制植物病害发生、危害的理论和技术依据,因而是植物病理学的重点研究领域,病原物与其植物寄主的关系实际上是一种相互制约或对立统一的关系,Flor在亚麻锈病研究中提出了著名的基因对基因(Gene for gene)的学说,即病原物存在有致病基因和无致病基因(或毒性基因和无毒基因),而植物相应地存在有感病性基因和抗病性基因。这一学说一直用作研究植物-病原相互作用以及分析植物抗(感)病性遗传的主要理论依据。但是,病原物与植物的相互关系特别是亲和关系是在长期的共进化过程中逐渐形成的,因而是十分复杂的,而且不同的植物-病原相互关系的密切程度也不相同。故Flor的模式不可能解释所有植物病害中的病原和寄主间的复杂关系。展开更多
A lipase-producing bacterium strain was isolated from soil and was identified as Pseudomonas sp.. Its lipase yield was improved 2.25-fold by combined beatment of UV irradiation and NTG. The lipase fermentation conditi...A lipase-producing bacterium strain was isolated from soil and was identified as Pseudomonas sp.. Its lipase yield was improved 2.25-fold by combined beatment of UV irradiation and NTG. The lipase fermentation condition for the mutant strain was optimized with Plackett-Burman design and Response Surface Analysis(RSA), and the formula of the optimum medium suitable for industrial scale fermentation was thereby established. A maximum yield of 87.5 U/ ml was obtained.展开更多
文摘植物和病原物的相互作用机制是有效地控制植物病害发生、危害的理论和技术依据,因而是植物病理学的重点研究领域,病原物与其植物寄主的关系实际上是一种相互制约或对立统一的关系,Flor在亚麻锈病研究中提出了著名的基因对基因(Gene for gene)的学说,即病原物存在有致病基因和无致病基因(或毒性基因和无毒基因),而植物相应地存在有感病性基因和抗病性基因。这一学说一直用作研究植物-病原相互作用以及分析植物抗(感)病性遗传的主要理论依据。但是,病原物与植物的相互关系特别是亲和关系是在长期的共进化过程中逐渐形成的,因而是十分复杂的,而且不同的植物-病原相互关系的密切程度也不相同。故Flor的模式不可能解释所有植物病害中的病原和寄主间的复杂关系。
文摘A lipase-producing bacterium strain was isolated from soil and was identified as Pseudomonas sp.. Its lipase yield was improved 2.25-fold by combined beatment of UV irradiation and NTG. The lipase fermentation condition for the mutant strain was optimized with Plackett-Burman design and Response Surface Analysis(RSA), and the formula of the optimum medium suitable for industrial scale fermentation was thereby established. A maximum yield of 87.5 U/ ml was obtained.
