Figure 1

Relative chlorophyll content (a,b), performance index on absorption basis (PIABS) (c,d), and density of active reaction centres (10RC/ABS) (e,f) of grafted watermelon seedlings at four time intervals under three light treatments (a,c,e) and at day 6 (144 h) under nine light treatments (b,d,f) in the healing chamber. Bars (± SE) within a time interval followed by different letters are significantly different (a < 0.05). Mean values derived from n = 10 seedlings.