Physiology of apple rootstock susceptibility to Pythium ultimum
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Authors
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I.M. SHARMA and V.K. GUPTA
University of Horticulture and Forestry, Horticultural Regional Research Station, Jachh 176 201, Himachal Pradesh
Keywords:
Collar rot, enzymes, Pythium ultimum, rootstocks, sugar, susceptibilityAbstract
Studies on six apple rootstocks, namely, M7, M9, M25, M103 , MM104 Â and MM115, showing different reaction to Pythium ultimum, causing collar rot of apple in Himachal Pradesh, were undertaken. In healthy (uninoculated) rootstocks, maximum amount of reducing and non-reducing sugars, higher activity of (l- amylase, invertase and protease was recorded in highly susceptible rootstocks (MM103, MM104), and minimum in resistant rootstocks (MM103, MM104). The activity of c- amylase was recorded maximum in the early stages of infection, however, the invertase and protease activity continued to increase up to 25th day of infection. The non-reducing sugars increase with a faster rate after infection only in resistant rootstocks (MM115) and their level declined in. susceptible rootstocks.
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