Deep-supercooling of winter buds and frost hardiness of twigs in some conifers

DOI JASI Web Site

Bibliographic Information

Other Title
  • 針葉樹の冬芽の過冷却と枝の耐凍性
  • シンヨウジュ ノ フユメ ノ カレイキャク ト エダ ノ タイトウセイ

Search this article

Abstract

Differential thermal analysis on winter buds and excised primordial shoots of subalpine or subboreal firs revealed that all these buds had low temperate exotherms around -30°C. However, no low temperature exotherm below -15°C was detected in the spring buds. In the winter bud of Abies firma, a temperate fir native to Japan, a low temperature exotherm was detected around -20°C, which is as much as 10°C higher than that of subalpine or subboreal fir. The low temperature exotherms of these firs occurred at nearly the same temperatures that result in the death of these primordial shoots. On the other hand, no low temperature exotherm was detected in the winter buds of subboreal spruces. In winter buds of larch, numerous small exotherms were observed, which were probably due to the number of leaf primordia in the buds. Unlike in many temperate deciduous broad-leaved trees, any low temperature exotherm was not detected in winter twig xylem of conifers such as Abies, Picea, Pinus, Larix and Pseudotsuga. Thus very hardy conifer twigs can tolerate extracellar freezing to -70°C.

Journal

Details 詳細情報について

Report a problem

Back to top