Diverse responses of tomato to N and P deficiency
2009
Khavari-Nejad, R.A. (Islamic Azad Univ. Tehran (Iran). Dept. of Biology) | Najafi, F. (Tarbiat Moalem Univ., Tehran (Iran). Dept. of Biology) | Tofighi, C. (Islamic Azad Univ. Tehran (Iran). Dept. of Biology)
Tomato plants were grown hydroponically under different deficient regimes of nitrogen (N) and phosphorus (P) in the form of nitrate and phosphate. Results showed a severe reduction in growth, soluble protein and chlorophylls contents under N deficiency, which suggested accelerating of leaf senescence. Furthermore, it was accompanied by enhanced activity of peroxidase and sugars contents that were both correlated with increased shoot anthocyanins content. Under P deficiency, similar results were observed except reduced concentration of sugars and chlorophylls and that both peroxidase activity and anthocyanins contents were higher in P-deficient plants. On the whole, tomato showed reduced tolerance to N than P deficiency, although N deficiency was more damaging. Reduced content of soluble proteins was an important criterion of N and P tolerance. Plant tolerance to low P supply was accompanied by increased activity of peroxidases and accumulation of anthocyanins.
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