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Publication Type J
Authors Dunn, G. M. and T. F. Neales
Title Are the Effects of Salinity on Growth and Leaf Gas Exchange Related
Source Photosynthetica
Author Keywords SALT TOLERANCE/ VULGARIS L/ PHOTOSYNTHESIS/ LEAVES/ PLANTS/ HALOPHYTES/ STRESS
Abstract The responses of growth and leaf gas exchange to increasing salinity were measured in two halophytes [Atriplex nummularia (C-4), Atriplex hastata (C-3)] and one glycophyte [Hordeum vulgare (C-3)]. The growth (dry mass) of both the halophytes was significantly increased, by 54 and 17 %, respectively, as salinity was increased in the range 0-200 mol m(-3) NaCl. However, net CO2 assimilation rate (P-N), the intercellular CO2 concentration (c(i)) and leaf conductance (g(l)) were unaffected. At higher levels of salinity (in the range 400 - 600 mol m(-3) NaCl) the growth of the two halophytes was severely reduced (by 44 and 51 %, respectively). At these levels of salinity P-N, g(l) and c(i) were significantly depressed. 25 mol m(-3) NaCl significantly reduced the growth of H. vulgare by 44 %, but had no effect on P-N, g(l) and c(i). However, at 100 mol m(-3) NaCl, where growth was decreased by 62 %, P-N and g(i) were significantly reduced while ci was unaltered. There was thus, no association between the effects of salinity on growth and leaf gas exchange at low salinities (25-200 mol m(-3) NaCl). At higher salinities, leaf gas exchange and growth were both severely inhibited but it is unlikely that a direct causal relationship existed. At these salinities sodium concentration in the leaves (tissue water basis) was above 400 mol m(-3) in the halophytes and above 100 mol m(-3) in H. vulgare which possibly affected both growth and leaf gas exchange independently. Also, the effects of salinity on total leaf chlorophyll concentration and net CO2 assimilation rate expressed on a chlorophyll (chl) basis (P-chl) were no better related to growth than was P-N.
ISSN 0300-3604
ISBN 0300-3604
Year Published 1993
Volume 29
Issue 1
Beginning Page 33-42
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