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RESULT

The most obvious morphological responses to infection by Meloidogyne spp are the

characteristics of knotting or galling in the host plant roots. Root galls were introduced by the
present test organism, M. incognita on the S. melongena plant in varied size and location.

Plant growth

The mean fresh weight of root and shoot system of S.melongena infected with

M.incognita is given in Table 1. Due to nematode infection the total plant growth of the plant

was found to be decreased by 47.17% when compared to the CUI plant. The root shoot ratio
(R/S) of the CUI plant was found to be 0.449 and due to nematode infection, it is decreased to

0.334.

Biochemical Constituents

Various biochemical profile like sugar, starch, enzymes in root and shoot tissues of
control and infected plant of S.melongena are present in Table 2 and 3. The total sugar

content was found to be reduced in the infected un-treated plant. Such reduction was found to
be maximum in the shoot system (36.61%) whereas it was found to reduce by 9.47% in the

root system when compared to respective control uninfected plant. The nematode infection
resulted in a decreased level of starch content in the root and shoot system by 21.1% and

38.44% respectively compared with respective CUI plants (Table 2 and 3). It is noticed that

more amount of starch reduction was observed in the shoot system. The activity of β amylase
enzyme was found to be reduced by 49.15% and 50.57% in the root and shoot system when

compared to the respective control uninfected plant.

The statistical analysis of critical difference at 5 and 1% reveal the nematode infection

shows significant effort on various parameters studied (Table 2 and 3). The statistical analysis
of the student’s test reveals that nematode infection significantly influenced various

parameter studied (Table 4).

Enzymatic studies

Alcohol dehydrogenase
The root- knot nematode infection result and in a reduction in the activity of alcohol

dehydrogenase both in root and shoot systems when compared to the respective CUI plant.

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