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向日葵花盘水提物对硫色镰刀菌及其细胞壁降解酶活性抑制特性.docx
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2023-02-23
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向日葵花盘水提物对硫色镰刀菌及其细胞壁降解酶活性抑制特性.docx
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摘要
通过抑菌及细胞壁降解酶活性试验,研究向日葵花盘(sunflower disc,SFD)水提物对引起马铃
薯干腐病主要病原菌——硫色镰刀菌(Fusarium sulphureum)生长及其侵染不同马铃薯品种时
分泌的多聚半乳糖醛酸酶(polygalacturonase,PG)、果胶甲基半乳糖醛酸酶(polymethyl⁃
galacturonase,PMG)、纤维素酶(carboxymethyl cellulose,Cx)、β⁃ 葡萄糖苷酶活性变
化。结果表明,向日葵花盘水提物对硫色镰刀菌生长及侵染陇薯 7 号、陇薯 10 号、新大坪 3 个马
铃薯品种分泌的 4 种细胞壁降解酶活性均具有抑制作用,最佳抑制浓度为 320 mg/mL,在 0~640
mg/mL 浓度内,随浓度增大,对硫色镰刀菌生长的抑制作用增强;经最佳抑制浓度处理能使陇薯 7
号的 PG 和 β⁃葡萄糖苷酶活性降低到未侵染水平,但 β⁃葡萄糖苷酶活性的降低未达到极显著效果,
该处理不能使陇薯 7 号的 PMG 和 Cx 及陇薯 10 号、新大坪的 4 种细胞壁降解酶活性降低到未侵
染水平。
Abstract
By methods of bacteriostatic test and cell⁃wall degrading enzyme activity test, this
study investigated the biological control effect of water extract from sunflower disc
on Fusarium sulphureum and the activities of 4 cell⁃ wall degrading enzymes.
Polygalacturonase(PG), polymethyl⁃galacturonase(PMG), carboxymethyl
cellulose(Cx) and β⁃glucosidase were 4 cell⁃wall degrading enzymes secreted
by Fusarium sulphureum invading the different potato varieties. Results show that
the extract is of inhibition effects on Fusarium sulphureum and activities of 4 cell⁃
wall degrading enzymes secreted by Fusarium sulphureum invading potato tubers
from 3 potato varieties of Longshu No. 7, Longshu No. 10 and Xindaping, and the
best inhibition occurrs at the concentration of 320 mg/mL. With the increasing of
concentration in the range of 0 to 640 mg/mL, the inhibition effect on Fusarium
sulphureum increased. Treated by the extract of the best concentration, the
activities of polygalacturonase(PG) and β⁃glucosidase of Longshu No. 7 can be
reduced to the uninfected level, but the reduction of β⁃ glucosidase activity did not
achieve a very significant effect. The activities of polymethyl⁃galacturonase(PMG)
and carboxymethyl cellulose(Cx) of Longshu No. 7 and the activities of 4 cellwall
degrading enzymes of Longshu No. 10 and Xindaping could not be reduced to
uninfected levels.
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关键词
向日葵花盘; 硫色镰刀菌; 马铃薯干腐病; 细胞壁降解酶
Keywords
sunflower disc; Fusarium sulphureum; potato dry rot; cell wall degrading enzyme
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