Abstract
AbstractLarge changes occur in carbohydrate contents of pine (Pinus silvestris L.) and spruce (Picea abies (L.) Karst.) seedlings coldâhardened by photoperiod or by combined photoâ and thermoâperiod. The largest change is in sucrose content, which is almost doubled after six weeks shortâday (6/18 h) treatment; and more than doubled (spruce) or more than tripled (pine), when also temperature is lowered (10/5°C). Development of frost hardiness is strongly correlated with the change in carbohydrate contents. At dehardening, the carbohydrate content decreases rapidly, especially in pine, and the raffinose formed during the rest period disappears within 2â4 weeks. Frost hardiness decreases in parallel.The content of soluble carbohydrates may thus play a role in frost hardiness, although it is not the only factor. Bud formation at cold acclimation is not directly correlated with the changes in carbohydrate content and hardiness.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have