Quantitative characteristics of the phases of winter dormancy of conifer species at a site in Central Siberia

Brazilian Journal of Botany - Tập 39 - Trang 1005-1014 - 2016
Nina V. Pakharkova1, Hermann Heilmeier2, Irina G. Gette1, Elena B. Andreeva3, Alexi M. Grachev4, Nikolay A. Gaevskiy1, Yurii S. Grigoriev1
1Siberian Federal University, Krasnoyarsk, Russia
2TU Bergakademie Freiberg, Freiberg, Germany
3State Natural Reserve Stolby, Krasnoyarsk, Russia
4Institute of Geography of the Russian Academy of Sciences, Moscow, Russia

Tóm tắt

Traditionally the registration of seasonal changes in plant growth and development has been carried out phenologically, i.e., qualitatively using visual inspection. However, since the process of plant acclimatization to winter dormancy involves reversible biochemical and physiological changes at the level of cells, quantitative methods can be applied to determine the duration and the depth of winter dormancy in perennial plants. We used a method based on detecting thermally induced changes in the zero-level fluorescence (TICZF) on needles from four Siberian coniferous trees. Needles of Picea obovata Ledeb. and Abies sibirica Ledeb. recover from the state of winter dormancy much faster than those of Pinus sibirica Du Tour and Pinus sylvestris L. The photosynthetic apparatus in the needles of A. sibirica may be damaged during the spring period, characterized by unstable weather, when after several days of warm weather, the plants prematurely recover from winter dormancy. We conclude that under conditions of climate warming tree, species like A. sibirica may suffer from severe diebacks due to desiccation caused by premature break of winter dormancy.

Tài liệu tham khảo

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