RESPONSE OF PLANT GROWTH REGULATORS ON LEAF PHOTOSYNTHETIC PIGMENTS OF POT MARIGOLD
Seyedeh Fatemeh Moosavi Sardoo*
ABSTRACT
Effect of gibberellic acid on marigold (Calendula Officinalis L.) was
evaluated in a pot culture experiment. A factorial experiment based on
completely randomized design including 12 treatments and four
replications was carried out. Main factor was foliar application stages
(first, second and third) and sub factor included different
concentrations of GA3 (0, 50, 150 and 250 mg L-1). Results showed
that foliar application of GA3 had positive effect on photosynthetic
pigments. Effect of different concentrations of GA3 on chlorophyll a
was significant (p<0.01). Chlorophyll a content was enhanced by
increase in GA3 concentration up to 250 mg L-1 treatment of 250 mg L
-1 resulted in production of 7.78 μg/L-1 chlorophyll a, the index which was to some extent
dropped in other concentrations. Different concentrations of GA3 had significant effect on
chlorophyll b (p<0.01). Chlorophyll b was increased by increase in GA3 concentration up to
250 mg L-1. the highest rate of total chlorophyll content and total pigment in three times of
application and one application of 250 mg L-1 was 14.6 and 15.4 μg/L-1 respectively; whereas
the lowest chlorophyll and pigment content was observed in one foliar application of control
treatment with mean value as 4.67 and 5.5 μg/L1.
Keywords: Calendula officinalis, Chlorophyll, Carotenoids, Gibberellic Acid.
[Download Article]
[Download Certifiate]