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PLANT PHYSIOLOGY , Vol 111, Issue 1 109-113, Copyright © 1996 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Water Deficit-Induced Changes in Concentrations in Proline and Some Other Amino Acids in the Phloem Sap of Alfalfa
C. Girousse, R. Bournoville and J. L. Bonnemain
Laboratoire de Zoologie, Institut National de la Recherche Agronomique Lusignan, 86600 Lusignan France (C.G., R.B.)
Changes in amino acid composition of alfalfa (Medicago sativa L.) phloem
sap were studies in response to a water deficit. Sap was collected by
stylectomy. As the leaf water potential ([psi]) decreased from -0.4 to -2.0
MPa, there was significant increase of the total amino acid concentration,
due to that of some amino acids: proline, valine, isoleucine, leucine,
glutamic acid, aspartic acid, and threonine. Asparagine concentration,
which is the main amino acid assayed in the phloem sap of alfalfa (it
accounts for 70% of the total content), did not vary with the plant water
status. The other amino acid concentrations remained stable as [psi]
varied; in particular, [gamma]-amino butyric acid concentration remained
unchanged, whereas it varied in response to wounding. The more striking
change in the sieve tubes was the accumulation of proline, which was
observed below a [psi] threshold value of about -0.9 MPa (concentration x60
for a decrease of [psi] from -0.9 to -2.0 MPa). The role of such changes in
phloem sap amino acid concentration in osmotic adjustment of growing
tissues is discussed.
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