Wood structure of Prosopis alpataco and P. argentina growing under different edaphic conditions.

VILLAGRA, P.E.

JOURNAL OF ARID ENVIRONMENTS

ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Año: 1997 vol. 37 p. 231 - 267

0140-1963

Prosopis argentina and P. alpataco are shrubs occupying areas with different soil characteristics within the temperate arid zone of Argentina: P. alpatacoand P. alpataco are shrubs occupying areas with different soil characteristics within the temperate arid zone of Argentina: P. alpatacoP. alpataco occurs in periodically flooded, clayish and saline areas; P. argentina occurs in non-saline sand dunes. The former may have developed adaptive tolerance to salt stress while the latter did not. The objective of this work was to determine the effects of salinity, and its interaction with temperature, on the germination of these species. Increasing concentrations of NaCl solutions (0, 0·2, 0·3, 0·4 and 0·6 mol kg–1 NaCl) at 25°C and 35°C were tested. Daily and final germination percentages, as well as germination rate, were recorded under controlled conditions. Results show that increasing salinity caused a decrease in both rate of germination and final percentages for both species, P. alpatacoP. argentina occurs in non-saline sand dunes. The former may have developed adaptive tolerance to salt stress while the latter did not. The objective of this work was to determine the effects of salinity, and its interaction with temperature, on the germination of these species. Increasing concentrations of NaCl solutions (0, 0·2, 0·3, 0·4 and 0·6 mol kg–1 NaCl) at 25°C and 35°C were tested. Daily and final germination percentages, as well as germination rate, were recorded under controlled conditions. Results show that increasing salinity caused a decrease in both rate of germination and final percentages for both species, P. alpataco–1 NaCl) at 25°C and 35°C were tested. Daily and final germination percentages, as well as germination rate, were recorded under controlled conditions. Results show that increasing salinity caused a decrease in both rate of germination and final percentages for both species, P. alpatacoP. alpataco being more salt-tolerant than P. argentina. The greatest differences appeared between 0·3 and 0·4 mol kg–1 NaCl. Germination was more affected by salinity at 35°C than at 25°C for both species.P. argentina. The greatest differences appeared between 0·3 and 0·4 mol kg–1 NaCl. Germination was more affected by salinity at 35°C than at 25°C for both species.–1 NaCl. Germination was more affected by salinity at 35°C than at 25°C for both species.