Transplanting shock in white spruce; effect of cold-storage and root pruning on water relations and stomatal conditioning.

Autor: Blake, T. J.
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Zdroj: Physiologia Plantarum; Feb83, Vol. 57 Issue 2, p210-216, 7p
Abstrakt: White spruce [Piceae glauca(Monech Voss] seedlings were pre-conditioned by Cold storage and root pruning and a study was made of the effects of conditioning on root regeneration and stomatal adaptation following transplanting. Root pruning (0 to 75% of the initial root area) of dormant seedlings immediately prior to transplanting did not confer any detectable physiological advantage in either cold-stored or freshly-lifted seedlings. Transpiration rates and stomatal resistance were not greatly affected by root pruning in the 6 week period after planting and root pruning did not greatly alter the response to drought. Cold-stored seedlings appear better able to avoid transplanting shock and an early drought despite delayed root growth as evidenced by a) a delay in flushing of new shoot growth and b) pre-conditioning of the stomatal apparatus which reduced water loss after planting and when moisture was limiting. Seedlings freshly-lifted in the spring did not show these adaptive responses and their stomata were poorly adapted to reduce water loss in the post-planting period after a drought. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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