Effect of fusaric acid on the leaf physiology of cucumber seedlings

Abstract

The damaging effects of fusaric acid (FA), a fungal toxin produced by Fusarium oxysporum, on cucumber seedlings were investigated in a greenhouse experiment. The accumulation of red ink was introduced as damage determination, the vines and mesophyll cells of the plants treated with high concentration of FA were acutely stained to a deep red colour, and the quantity of red ink in the shoots and roots was significantly increased. The leaf plasma membrane H+-ATPase was significantly inhibited after treatment with FA. Moreover, transmission electron microscopy and electrolyte leakage experiments revealed severe FA-induced injury to leaf cell membranes. The membrane injury and wilt in the leaves of FA-treated plants disturbed the water status, and the leaf water potential was significantly decreased. The present results suggested that FA inhibits the leaf plasma membrane H+-ATPase and reduce the cell membrane integrity of cucumber seedlings, thus leading to leaf wilting and a reduction of the leaf water potential.

DOI: 10.1007/s10658-013-0306-4

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@article{Wang2013EffectOF, title={Effect of fusaric acid on the leaf physiology of cucumber seedlings}, author={Min Wang and Ning Ling and Xian Dong and Xiaokang Liu and Qirong Shen and ShiWei Guo}, journal={European Journal of Plant Pathology}, year={2013}, volume={138}, pages={103-112} }