BIOCHEMICAL BASIS OF RESISTANCE AGAINST POTATO APICAL LEAF CURL VIRUS DISEASE IN POTATOManoj Kumar, Jaywant Kumar Singh, Pradeep Kumar Dalal and Anil Kumar
Potato (Solanum tuberosum L.) is one of the most important vegetable crops and biochemical parameters in addition to its genetic resistance provide information regarding the susceptibility or resistance against the diseases. Among the various diseases occurring on potato crop, potato apical leaf curl virus disease (PALCVD) is one of the most limiting factors in its productivity. Biochemical analysis viz., total phenol, flavanols, peroxidase and tannin contents, in the varieties Kufri Bahar (resistant), Kufri Pushkar (moderately resistant) and Kufri Khyati (susceptible) at 20, 40, 60, and 80 day after planting from both healthy and diseased plants revealed that higher total phenol, flavanols, peroxidase and tannin contents were found in resistant variety, less in moderately resistant and least in susceptible variety. All these biochemical parameters were significantly higher in diseased leaves as compared to healthy leaves. The increased quantity of all biochemical parameters content might be attributed to defense mechanism. With the initiation of the disease, there was significant increase in biochemical contents in the leaves of moderately resistant variety and susceptible variety up to 60 days after planting and thereafter the contents decreased.
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