Amino acid contents in cowpea seeds as influenced by foliar application of potassium naphthenate and naphthalene acetic acid
AMINO ACID CONTENTS IN COWPEA SEEDS AS INFLUENCED BY FOLIAR
APPLICATION OF POTASSIUM NAPHTHENATE AND NAPHTHALENE ACETIC ACID
M. J. Ullah*, F. Hossain , Q. A. Fattah, and A. B. M. Khaleduzzaman
*Corresponding author, E-mail: jafarullahsau@gmail.com
Abstract
A field experiment was conducted at the research farm of Sher-E-Bangla Agricultural
University during the rabi season of 2001-2002. Three concentrations of potassium
naphthenate (1200, 1300 and 1400 ppm) and two concentrations of naphthalene acetic
acid (40 and 50 ppm) were tested on cowpea along with a control with water spray to
evaluate their effects on amino acid contents (Glutamic acid, Aspartic acid, Leucine,
Arginine, Lysine, Phenylalanine, Serine, Valine, Alanine, Glycine, Isoleucine, Threonine
and Tyrosine) in cowpea seeds. Foliar application of NAA and KNap greatly influenced
the amino acids content in cowpea seeds. Spraying NAA (both 40 and 50 ppm) increased
Glutamic acid (3.37 to 6.35%), Aspartic acid (2.68 to 7.05%), Lysine (2.62 to 4.71%) and
Serine (5.0 to 12%) contents as compared to control while reverse result was observed
with KNap spaying. Both NAA and KNap spraying increased arginine content in seeds.
The maximum Arginine (2.00-2.01%) was obtained by KNap 1300 and NAA 50 ppm;
and that of Leucine (2.018% with KNap 1300 ppm. NAA 50 ppm showed the highest
value of Serine. The higher concentration of KNap showed higher Valine content (1.28-
1.3%). The highest value of Glycine was found with KNap 1300 ppm while that of
Alanine with KNap 1300-1400 ppm. Isoleucine, Tyrosine, Threonine and Phenylalanine
neither increased nor were affected with growth regulator applications.
Key words: Cowpea, Vigna unguiculata and Amino acids.
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