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不同理化因子对雪莲培养细胞中黄酮类形成的影响 总被引:24,自引:2,他引:24
研究了不同理化因子对水母雪莲(Saussurea medusa Maxim)愈伤组织生长及黄酮类化合物生物合成的影响。结果表明,有利于细胞生长及黄酮形成的合适温度为25℃。白光对愈伤组织生长无促进作用,但有利于黄酮的形成。培养基中添加1mg/L NAA和O.2mg/L的KT组合对细胞的生长较有促进作用。5%蔗糖和1%葡萄糖的组合有利于细胞的生长和黄酮的形成。用60C0-γ射线辐照愈伤组织,在剂量为4000Gy的条件下,获得一个合成黄酮能力高于原愈伤组织70%的细胞系。用高效液相和紫外分光光度法,测定离体培养光照条件下干细胞总黄酮的含量为3.2%,是暗培养的4.4倍。培养温度25℃时干细胞黄酮的含量为2.02%,分别为20℃,35℃时的5倍和3.2倍。 相似文献
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季也蒙假丝酵母对采后桃果实软腐病的抑制效果 总被引:4,自引:0,他引:4
The biocontrol capability of Candida guilliermondii (Cast) Langeroret Guerra against Rhizopus stolonifer (Ehrenb.ex Fr.) Vuill. postharvest rot of peach fruits was studied in vitro and in vivo under different storage temperatures. C. guilliermondii at 5.0×108 CFU (colony-forming unit)/mL of washed cells provided complete control of 5×104 spores /mL of R. stolonifer during storage at 25 ℃ for 4 d, 15 ℃ for 7 d and 3℃ for 30 d. Temperature had no significant effect on the biocontrol efficacy. Antagonist population increased 45.6, 34.4 and 33.1 times per site at 25℃, 15℃ and 3℃ for 3, 3 and 7 d,respectively, then the population stabilized for the remaining storage period. Cell-free culture filtrate of C. guilliermondii was not effective in preventing decay and resulted in even greater lesion diameter than those of sterile distilled water at 3 ℃.These results showed that competition for nutrient, not antibiotic production, plays a major role in the biocontrol capability of C. guilliermondii against rhizopus rot of peach fruits. As the interval between wounding and inoculation with the pathogen increased from 0 to 72 h, susceptibility of wounds to decay by R. stolonifer decreased from 100% of 0 h to 5% of 4 h and 0% of 24 h, then increased to 10% of 48 h and 40% of 72 h. 相似文献
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丝孢酵母与钙和杀菌剂配合对苹果采后病害的抑制效果(英文) 总被引:9,自引:0,他引:9
研究一种从桃果实上分离获得的拮抗菌———丝孢酵母 (Trichosporonsp .)对苹果 (MalusdomesticaBorkh .)采后病害的防治效果 ,包括接种不同浓度的拮抗菌与不同病菌之间的拮抗作用 ,以及拮抗菌与钙或与杀菌剂配合对苹果灰霉病和青霉病的抑制效果。结果表明 ,拮抗菌和病菌孢子的浓度都明显地影响其抑菌效果。拮抗菌的使用浓度越大 ,病菌孢子的接种浓度越低 ,其抑病效果越好。当丝孢酵母菌的使用浓度达到 10 8colony_formingunits(CFU) /mL时 ,可完全抑制接种在苹果上的灰霉菌 (BotrytiscinereaPers.)和青霉菌 (Penicilliumexpansum (Link)Thom)(<10 6spores/mL)的致病力。用 10 6~ 10 7CFU/mL的丝孢酵母与 5 0 μL/L的扑海因配合对苹果采后灰霉病和青霉病的抑制效果明显地好于单独使用相同剂量的拮抗菌或杀菌剂。在丝孢酵母的悬浮液中加入 1%~ 2 ?Cl2 可显著地提高拮抗菌对灰霉病和青霉病的抑制效果。 相似文献
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