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Alternaria alternata is a necrotrophic fungus that may cause severe losses. To further elucidate the resistance mechanisms, we investigated the impacts of increasing biotic stress, or severity levels (5%, 25% and 50%), due to A. alternata infection on two tobacco cultivars with varying resistance levels. Under severe stress, the photosynthetic pigment, net photosynthetic rate (Pn), stomatal conductance...
Differences in nitrogen metabolism were analyzed in mature leaves of three tobacco cultivars with different levels of resistance to brown spot disease (Alternaria alternata) including one resistant (JYH) and two susceptible cultivars (NC89 and CBH). The results were as follows: All three cultivars had low levels of both total nitrogen and leaf tissue NH4+; the activity of glutamine synthetase (GS)...
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