WATER RELATIONS OF ATRIPLEX-REPANDA PHIL, UNDER 2 IRRIGATIONS TREATMENTS

Authors
Citation
H. Silva et E. Acevedo, WATER RELATIONS OF ATRIPLEX-REPANDA PHIL, UNDER 2 IRRIGATIONS TREATMENTS, REV CHIL HN, 66(4), 1993, pp. 467-477
Citations number
NO
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Revista chilena de historia natural
ISSN journal
0716078X → ACNP
Volume
66
Issue
4
Year of publication
1993
Pages
467 - 477
Database
ISI
SICI code
0716-078X(1993)66:4<467:WROAPU>2.0.ZU;2-K
Abstract
The variation of osmotic potential, symplastic water content and tissu e elasticity have been studied by the pressure-volume technique, on ac tive growing plants under two irrigation treatments. Pressure-volume c urves were made on terminal branches of Atriplex repanda Phil., a shru b from the semiarid zone of Chile. Results showed that when the water deficits is gradual, plants adjust the osmotic potential of their term inal branches in spite of a decrease in the total water potential. The osmotic potential at full turgor is relatively constant for plants wi ch are not conditioned to water deficit. In constrast, conditioned pla nts show a decrease of -0.4 MPa. Plants undergo water deficit the elas ticity modulus decreases about 25% compared to those without water def icit. Osmotic adjustment and elasticity modifications of cellular wall s of plants conditioned to water deficit have a complementary effect o n the maintenance of cell and tissue turgor.