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Annals of Plant Protection Sciences
Year : 2009, Volume : 17, Issue : 1
First page : ( 195) Last page : ( 199)
Print ISSN : 0971-3573. Online ISSN : 0974-0163.

Pathophysiology of Vigna unguiculata infected by Meloidogyne incognita in Relation to Nitrogen Stress

Vaitheeswaran M., Ibrahim S. Mohamed*

Department of Zoology, V.O Chidambaram College, Thoothukudi, 628 008, India.

*E-mail: <mohamedibrahim_5@rediffmail.com>

Abstract

The impact of pathogenesis was reflected at tissue level with low sugar, elevated protein, phenol and lipid levels under normal nitrogen stress. The reduced sugar content in excess nitrogen treated infected plant might be due to stimulated protein synthesis for which large amount of sugar may be needed. The reduction in sugar content during nitrogen deficiency might be due to decreased activities of the nematode. Nitrogen in excess resulted in accumulation of protein. It might be due to the fact that the nitrogen in excess countered the parasitic effect by promoting the synthesis of protein as evidenced by increased value. Nitrogen deficiency also resulted in reduced protein due to depressed turnover of the amino acid. A general reduction in the activities of most of the enzymes was observed in the infected plant under normal nitrogen stress. The reduced activities exhibited by the dehydrogenases of glycerol, glucose and alcohol might be due to reduced availabilities of sugar. When this feature was correlated with the turnover of metabolites in the infected plants under normal nutrition stress, a reduction in the metabolites could be observed in the infected host plant under nitrogen deficiency stress. The reduced activities exhibited by the enzymes involved in TCA cycle was due to reduced availability of the substrates. This feature was observed to be more at infection site, showing the greater stress undergone by the root.

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Key words

Meloidogyne incognita, Nitrogen stress, Pathophysiology, Vigna unguiculata.

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