Lentil (Lens culinaris Medik.), a very important legume crop, is
widely cultivated and its consumption is steadily increasing. The
plants are grown for their small lens-shaped edible seeds, which
are rich in protein (35–40%) and carbohydrates, and are a good
source of calcium, phosphorus, iron and B vitamins. Therefore,
keeping in view the importance of different growth regulators in
increasing crop growth and yield, studies were carried out to
compare the effect of GA3, IAA, and kinetin on lentil growth
(Polanco and Ruiz, 1997; Naeem et al., 2004). Different physiological
and biochemical methods are employed for screening the
effects of PGRs on plants. The content of chlorophylls in crop leaves
provides valuable information about plant physiological status as
chlorophyll content can directly estimate photosynthetic potential
and primary production. Along determination of chlorophyll
content in plant leaves, measurements of chlorophyll fluorescence
in vivo are a rapid and non-intrusive tool used during the screening
of crop plants (Maxwell and Johnson, 2000).