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The effect of heterologous VHb expression to the functioning of stress-related genes in hybrid aspen lines exposured to biotic stress

H. Häggman,S. Sutela,Soile Jokipii-Lukkari,T. Ylioja,R. Kasanen,Anna-Kaisa Anttila,M. Suokas,Estelle Dumont,P. Kallio

Published 2011 in BMC Proceedings

ABSTRACT

Background The hemoglobin produced by Vitreoscilla bacterium, VHb, is capable to promote the respiratory activity and ATP production under hypoxic conditions [1]. In micro-organisms grown under oxygen-limited conditions, the heterologous vhb expression improves the production of primary and secondary compounds, growth as well as stress tolerance [2,3]. VHb has also been shown to protect plants against deleterious effects of nitric oxide (NO), the important signalling molecule produced during pathogen challenges [4]. We have previously studied the vhb expressing hybrid aspen lines (Populus tremula L. x tremuloides Michx.) under elevated UV-B illumination and showed that the VHb lines had increased secondary metabolite production and also enhanced accumulation of starch in chloroplasts when grown in standard greenhouse conditions [5]. In order to reveal the effect of VHb on the expression of stressrelated genes in hybrid aspen exposed to biotic stress, we conducted experiments with pathogenic fungus and larvae of insect herbivore.

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