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A Control 50 ppm B
25 ppm
100ppm
120
Leaf area (cm 2 ) 90

60

30

0
20 40 60
Days

C D

E

Fig. 1: Effects of different concentrations of IAA on root length (A), leaf area (B), number of leaves (C), fresh
(D) and dry weight (E) of Silybum marianum.
Chlorophyll Content

PGRs significantly affected the chlorophyll content of Silybum marianum. Chlorophyll

‘a’ content decreased with the growth of the plant (Fig. 2A). Maximum increase (20.36%) in
chlorophyll ‘a’ content is at 100 ppm concentration of IAA at 20 days of spraying (p<0.05).

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