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

Total free amino acids:
The results recorded in Table (3) and fig.(4) showed that spraying Antirrhinum majus plants with
different amino acids treatments caused a significant increase in the content of total free amion acids in
leaves. Application of the high phenylalanine concentration (100 ppm) was the most effective
treatment in producing the highest values, followed by tryptophan of the rate of 100 ppm. The
increase in the content of total free amino acids as a result of the tryptophan treatments may be
attributed to its conversion of to IAA, as stated by Phillips (1971). Furthermore, the combination
between the two amino acids were almost positive for the content of the total free amino acids.
Tryptophan at 100 ppm + phenylalanine at 100 ppm gave the highest values of the total free amino
acid.
Our results are in agreement with the findings of Harridy (1986) on Catharanthus roseus L and Abou
Dahab and Abd El-Aziz (2006) on Philodendron erubescens.
Hence, it could be recommended that treatment of Antirrhinum majus plants with tryptophan and
phenylalanine (especially at the concentration of 100 ppm) had a beneficial effect growth and chemical
constituents.
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