Journal of Stress Physiology & Biochemistry, Vol. 6 No. 3
2010, pp. 25-37 ISSN 1997-0838
Original Text Copyright (cc) 2010 by Abd El-Samad, Shaddad and Barakat
ORIGINAL
ARTICLE
Data source : Google Scholar
QueryDate : 2016-12-24
Cites : 5
The role of amino acids in improvement
in salt tolerance of crop plants
Abd El-Samad1, H. M., M. A. K. Shaddad2 and N.
Barakat1
1Botany Department,
Faculty of Science, El-Minia University, El- Minia, Egypt 2Botany Department, Faculty of Science, Assiut University,
Assiut, Egypt E. mail hmdia10@yahoo.com
Received May 5, 2010
The present work has been performed to study the growth and
metabolic activities of maize and broad bean plants which are shown to
have a degree of sensitivity to salinity and to determine the role of
amino acids proline or phenylalanine in increasing the salt tolerance
of theses plants. Dry mass, water content, leaf area and photosynthetic
pigment of maize and broad bean plants decreased with increasing
salinity. These changes were accompanied with a drop in the contents of
soluble sugars, soluble proteins and amino acids. This was accompanied
by a marked increase in the proline content. When maize and broad bean
plants sprayed with proline or phenylalanine the opposite effect was
occurred, saccharides as well as proteins progressively increased at
all sanitization levels and proline concentration significantly
declined. Salinity significantly increased the sodium content in both
shoots and roots of maize and broad bean plants, while a decline in the
accumulation of K+, Ca++, Mg++ and P
was observed. Amino acids treatments markedly altered the selectivity
of Na+, K+, Ca++ and P in both maize
and broad bean plants. Spraying with any of either proline or
phenylalanine restricted Na+ uptake and enhanced the uptake
of K+, K+/Na+ ratio, Ca++
and P selectivity in maize and broad bean plants.
