Are Winter Adaptive Changes in Glutatione and Chlorophyll Contents in Spruce Needles Triggered by Low Temperatures or Short Days? : 2nd Slovenian Symposium on Plant Physiology with international Participation, Gozd Martuljek. Slovenia, September, 30 to Oktober 2nd, 1998

1999

S. 171-174

2 Abb., 8 Lit.

Unselbständiges Werk

200059388

Concentrations of glutathione and chlorophyll a and b in spruce needles undergo seasonal variations in the field. Most prominent changes including increasis in glutathione contents take place in autumn when winter adaptation begins. Since in the field studies the factors low temperature and light period length cannot be separated, the present experiment was conducted in climate chambers. In August young trees of Picea abies (L.) Karst. were transferred to climate chambers conditions: One experimental variant with control temperature and short days and the second with control day length and low temperature. The conditions of the control chambers were outdoor conditions in August. Low temperature caused an increase in glutathione and decreases in chlorophyll a and b. On the contrary, short days induced a decrease in glutathione and increases in chlorophylls. The results indicate that the factor temperature might be more import for winter adaptations than the factor day length.