Some studies on the effect of putrescine, ascorbic - Ozean ...

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Fig. (1) Effect of phenylalanine and tryptophan on fresh and dry weight (gm) on Anterrhinum majus L.
plant at vegetative stage.
Value (g)
200
150
100
50
0
250
200
150
100
50
0
Fig. (2) Effect of phenylalanine and tryptophan on fresh and dry weight (gm) on Anterrhinum majus L.
plant at flowering stage.
On flowering:
Vegetative
stage
Control
Flowering stage
T 50
T 100
Ph 50 ppm
Data presented in Tables (1, 2) and Fig.(1, 2) showed that increasing different amino acids
(phenylalanine or tryptophan) from 50 to 100 ppm significantly increased plant height, number of
branches, fresh and dry weights of plant as well as length of inflorescence, number of
inflorescences/plant and fresh and dry weights of inflorescences/plant. Phenylalanine caused
increments on fresh and dry weights of inflorescence/plant by (3.3 % and 18.6%) respectively for the
50 ppm and 38.4 % and 57.9 %, respectively for 100 ppm compared with the untreated plants.
However, tryptophan caused increments on fresh and dry weights of inflorescence/plant by (4.3 % and
14.6 %) respectively for the 50 ppm and( 27.4 % and 30.7 %), respectively for 100 ppm compared with
the untreated plants. Our results are combatable with those obtained by Bekheta and Mahgoub (2005)
on Dianthus caryophyllus, Mona and Iman (2005) on Pelargonium graveolens L. and Nahed and
Balbaa (2007) on Salvia farinacea plants, they stated that application of amino acids led to the
increments of flowering parameters and found that amino acids produced a high quality of
inflorescences. The stimulatory effect were found to be correlated with the increase in content and
activity levels of endogenous promoters particularly gibberellins and IAA which are known to promote
linear growth of plant organs (Stoddart, 1986 and Wilkins, 1989).
In addition, the results obtained in table (2) indicated that, the interaction between different involved
factors (phenylalanine and tryptophan) were almost significant for flowering parameters. The highest
values due to amino acids were obtained due to (100 ppm phenylalanine and 100 ppm tryptophan ) for
flowering parameters.
402
Treatment (ppm)
Ph100
Ph 50+T 50
Treatment (ppm)
Ph 50+T100
FW of plant
DW of plant
Ph 100+T 50
FW of plant
DW of plant
Ph 100 +T 100