Ammonia-related metabolism of tobacco varieties differing in their susceptibility to Alternaria alternata

Ammonia-related metabolism of tobacco varieties differing in their susceptibility to Alternaria... Some studies report that ammonia is an important factor of disease development in tobacco plants and various post-harvest fruits. Four tobacco (Nicotiana tabacum L.) varieties resistant or susceptible to Alternaria alternata (Fries) Keissler, a tobacco pathogenic fungus, were used to investigate whether there are differences in ammonia accumulation and the related metabolism of senescing leaves. The results showed that: (a) the leaves of susceptible varieties had significantly higher apoplastic [NH 4 + ], pH, and ammonia emission potential (Γ-values) than resistant varieties during the period from 40 to 60 days of leaf age; (b) leaf tissue [NH 4 + ] and total N concentrations in the tobacco varieties were not in line with their susceptibility or resistance to disease; (c) the increases in the apoplastic pH, Γ-values, and leaf [NH 4 + ] occurred in parallel with a significant decline in glutamine synthetase activity. Compared with the resistant varieties, apoplastic pH values and Γ values were increased more rapidly in the susceptible varieties due to a steeper decline in glutamine synthetase activity and a slower increase in glutamate dehydrogenase activity. In conclusion, NH3 accumulation or NH3-dependent alkalinization rather than [NH 4 + ] and total N appears to be mainly attributed to the enhanced susceptibility of tobacco plants to A. alternata. Russian Journal of Plant Physiology Springer Journals

Ammonia-related metabolism of tobacco varieties differing in their susceptibility to Alternaria alternata

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SP MAIK Nauka/Interperiodica
Copyright © 2012 by Pleiades Publishing, Ltd.
Life Sciences; Plant Physiology; Plant Sciences
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