Stress reactions of Scots pine trees to injuring by ground fire

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• 作者：N. E. Sudachkova ; L. I. Romanova ; N. V. Astrakhantseva…
• 关键词：Scots pine ; ground fire ; cambium ; photosynthetic pigments ; carbohydrates ; antioxidant enzymes
• 刊名：Contemporary Problems of Ecology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：9
• 期：5
• 页码：608-616
• 全文大小：458 KB
• 刊物主题：Ecology;
• 出版者：Springer US
• ISSN：1995-4263
• 卷排序：9

文摘

Controlled burning has been carried out to stimulate moderate ground fire in the Scots pine (Pinus sуlvestris L.) stand (age class I) in the Krasnoyarsk forest steppe at the beginning of the growing season. The structure of annual rings and trophic supply, as well as the cambial zone antioxidant system condition and the content of photosynthetic pigments in the needles of dominant and suppressed trees in the experimental and control plots, were studied 3 h, 5 days, and 2.5 months after the fire. The fire narrowed the annual ring width, since the number and size of early and late tracheids decreased. The primary reaction to pyrogenic heat shock (sharp reduction of chlorophyll content in needles and manifestation of oxidative stress in the stem cambial zone) was an elevated level of hydrogen peroxide and activity of most antioxidant enzymes and a reduction in the nonstructural carbohydrates pool. Restoration of the cambium function after the fire was promoted by an increased activity of amylase, invertase, and peroxidase.