INVESTIGATION ON BIOCHEMICAL PARAMETER S ASSOCIATED WITH POWDERY MILDEW RESISTANCE IN MUNG BEAN [Vigna radiate (L.) Wilczek]
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Date
2001
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MPKV, UNIVERSITY LIBRARY RAHURI
Abstract
In the present investigation, leaf samples of two susceptible
(AKM-8802 and Kopergaon) and two resistant cultivars (Phule M-9339
and TARM-18) were used to study the association of some biochemical
parameters with resistance to powdery mildew in green gram. The crop
was grown in the field during the kharif season of 2000. The leaves of
both resistant and susceptible cultivars were analysed for reducing sugars,
non-reducing sugars, total sugars, cellulose, hemicellulose, lignin and
crude fibre. The rate of oxygen uptake by the leaves at healthy and
diseased stages of powdery mildew was also monitored.
The contents of reducing, non-reducing and total sugars both
before and after infection were found to be significantly higher in the
leaves of susceptible cultivars as compared to resistant ones. In general,
the sugar level in the leaves in both type of cultivars decreased markedly
upon infection. The contents of cellulose, hemicellulose and crude fibre
were found to be significantly higher in the leaves of resistant cultivars as
compared to the susceptible ones before the appearance of the disease.
The level of all these parameters, however, declined under the
pathogenesis of powdery mildew and the decline was more pronounced in
the resistant cultivars than the susceptible ones. Further, the level of
lignin was found to be higher in resistant cultivars than the susceptible
ones before the appearance of the disease. However after the infection,
the lignin content declined faster in resistant cultivars than the susceptible
ones. The oxygen uptake in the leaves was found to be higher in resistant
cultivars than the susceptible ones at the healthy stage, but the infection
of powdery mildew caused reduction in oxygen uptake in all these
cultivars.
The results of the present study thus indicated that there is an
involvement of some biochemical constituents such as sugars and lignins
in offering resistance to powdery mildew in green gram.
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