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Diagnostic parameters for selecting against novel spruce ( Picea abies ) decline: III. Response of photosynthesis and transpiration to O 3 exposures
Author(s) -
Saxe Henrik,
Murali N. S.
Publication year - 1989
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1989.tb06203.x
Subject(s) - transpiration , photosynthesis , picea abies , respiration , horticulture , botany , growing season , biology , zoology , chemistry
The dose‐ and time‐response effects of single 4 h day‐time exposures of 0.064, 0.166, 0.336, 0.452 or 0.693 μl l −1 (ppm) O 3 followed by single 4 h night‐time exposures of 0.078, 0.198, 0.378, 0.502 or 0.747 μl l −1 O 3 on photosynthesis, transpiration and dark respiration were examined for nine Carpatho‐Ukrainian (‘Rachovo’) half‐sib families and for two populations. ‘Westerhof’ from the FRG and ‘Schmiedefeld’ from the GDR, of Norway spruce [ Picea abies (L.) Karst.], all in their 4th growing season. Needles were scorched by 4 h exposures to 0.336 μl l −1 O 3 and higher. The lag before photosynthesis and transpiration responded significantly to O 3 decline took from a few minutes at the highest concentration to several hours at the lower concentrations. Recovery of photosynthesis and transpiration was absent or extremely slow. Photosynthesis of the different spruce types was affected significantly differently, the most sensitive spruce having its photosynthesis suppressed 1.9 times and its transpiration 1.6 times more than the most tolerant spruce. The physiological responses of ‘Westerhof’ were less sensitive than the average ‘Rachovo’ half‐sibs. Neither night transpiration nor dark respiration were affected by high doses of night O 3 , preceded by day O 3 exposures. The gradients of different photosynthesis and transpiration sensitivities of the young half‐sibs (and ‘Westerhof’) demonstrated a significant, positive, mutual correlation, and significant positive correlations with the gradient of novel decline symptoms of their parents growing in Danish forests. The relative photosynthesis and transpiration sensitivities may thus serve as diagnostic parameters in laboratory tests for selection against novel spruce decline.