Temperature Dependence of the Activity of Polyphenol Peroxidases and Polyphenol Oxidases in Modern and Buried Soilsстатья

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Дата последнего поиска статьи во внешних источниках: 26 марта 2017 г.

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1. Полный текст Статья Evrazijskie_pochvyi_2014.pdf 173,2 КБ 20 октября 2015 [yakushev2008]

[1] Temperature dependence of the activity of polyphenol peroxidases and polyphenol oxidases in modern and buried soils / A. V. Yakushev, I. N. Kuznetsova, E. V. Blagodatskaya, S. A. Blagodatsky // Eurasian Soil Science. — 2014. — Vol. 47, no. 5. — P. 459–465. Under conditions of the global climate warming, the changes in the reserves of soil humus depend on the temperature sensitivities of polyphenol peroxidases (PPPOs) and polyphenol oxidases (PPOs). They play an important role in lignin decomposition, mineralization, and humus formation. The temperature dependence of the potential enzyme activity in modern and buried soils has been studied during incubation at 10 or 20oC. The experimental results indicate that it depends on the availability of the substrate and the presence of oxygen. The activity of PPOs during incubation in the absence of oxygen for two months decreases by 2–2.5 times, which is balanced by an increase in the activity of PPPOs by 2–3 times. The increase in the incubation temperature to 20oC and the addition of glucose accelerates this transition due to the more abrupt decrease in the activity of PPOs. The preincubation of the soil with glucose doubles the activity of PPPOs but has no significant effect on the activity of PPOs. The different effects of temperature on two groups of the studied oxidases and the possibility of substituting enzymes by those of another type under changing aeration conditions should be taken into consideration in predicting the effect of the climate warming on the mineralization of the soil organic matter. The absence of statistically significant differences in the enzymatic activity between the buried and modern soil horizons indicates the retention by the buried soil of some of its properties (soil memory) and the rapid restoration of high enzymatic activity during the preincubation. [ DOI ]

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