Samples of leaves were taken for chlorophyll determination at
days 1, 3, 5 and 7 from the beginning of the experiment. Extraction
in acetone was repeated until all pigments were extracted. Chlorophyll
content was determined in samples of fresh leaves according
to Sadasivamand Manickam (1992). The absorbance of extractswas
determined by a spectrophotometer. The chlorophyll content was
calculated as mgg−1 fresh weight.