Main content area

Water use efficiency of Norway spruce with bud blight disease

Tomášková, I.
Acta horticulturae 2018 no.1222 pp. 133-136
Picea abies, Picea pungens, biotic stress, blight, fluorescence, fungi, gas exchange, hosts, mountains, pathogens, photosynthesis, shoots, trees, water use efficiency, Czech Republic
Gemmamyces piceae is the causal agent of bud blight disease of several spruce species contemporarily spreading within the Ore Mountains. In the Czech Republic, this invasive cryptogenic fungal pathogen was investigated in 2009 for the first time on Picea pungens trees. Within 5 years, new spreading to other host species (Picea abies) was recorded. The occurrence of this fungal pathogen can bring several consequences for the spruce, such as decrease of the photosynthetic rate and biochemical changes according to the level of the shoots damage. Moreover, the fungal disease decreases the water use efficiency (WUEinst) about 36% in heavily damaged spruce comparing to healthy ones. Similarly, decreases of gas exchange, fluorescent measurements, and photosynthetic pigment composition in infected and noninfected spruce individuals were recorded. Reasons for impaired physiological traits of spruce under biotic stress are discussed.