Involvement of exopeptidases in dehydration tolerance of spring wheat seedlings
2008
Miazek, A.,Warsaw Univ. of Life Sciences (Poland). Biochemistry Dept. | Zagdanska, B.,Plant Breeding and Acclimatization Inst., Warszawa (Poland). Plant Physiology and Biochemistry Dept.
The observed inability of 6-d-old seedlings of spring wheat (Triticum aestivum) to tolerate the same water deficit as compared with the 4-d-old seedlings seems to be associated with the higher carboxypeptidase and lower aminopeptidase activities. Free amino acid pools differentiated also the 4-d-old seedlings from the older ones. Dehydration decreased the amino acid content in 4-d-old seedlings, increased it in 6-d-old seedlings and changed composition of amino acid pool. Carboxypeptidase activity increased in response to water deficit in the tolerant phase of the growth. Aminopeptidase activity increased in dehydrated seedlings, independently of their age.
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