Table 2.
Impact of exogenous ABA (50 µm) and fluridone (FLU) application on total leaf ABA concentration, water content (WC) and leaf stomatal conductance (gleaf) in seedlings of Atriplex halimus issued from a coastal site (Monastir) or an inland area (Sbikha) and exposed for 10 d to control nutrient solution or to a nutrient solution containing 40 or 160 mm NaCl or 15 % PEG
Total ABA (nmol g−1 f. wt) |
WC (in %) |
gleaf (cm s−1) |
|||||
---|---|---|---|---|---|---|---|
Population | 50 µm ABA | FLU | 50 µm ABA | FLU | 50 µM ABA | FLU | |
Control | Monastir | 5·13 ± 0·12a | 0·21 ± 0·05a | 85·6 ± 1·1a | 77·3 ± 0·8a | 0·27 ± 0·01a | 0·39 ± 0·04a |
Sbikha | 5·02 ± 0·22a | 0·35 ± 0·02ab | 84·5 ± 0·9a | 78·4 ± 1·1a | 0·24 ± 0·03a | 0·36 ± 0·03a | |
40 mm NaCl | Monastir | 5·27 ± 0·14a | 0·29 ± 0·02a | 84·9 ± 1·3a | 73·2 ± 1·0b | 0·25 ± 0·02a | 0·27 ± 0·03b |
Sbikha | 4·89 ± 0·18a | 0·25 ± 0·08a | 80·5 ± 0·8a | 69·5 ± 0·4c | 0·19 ± 0·01b | 0·23 ± 0·01b | |
160 mm NaCl | Monastir | 5·12 ± 0·23a | 0·42 ± 0·04b | 82·3 ± 1·7a | 75·4 ± 1·2ab | 0·30 ± 0·02a | 0·29 ± 0·02b |
Sbikha | 4·94 ± 0·38a | 0·25 ± 0·03a | 75·3 ± 2·4b | 67·4 ± 1·3c | 0·20 ± 0·03ab | 0·27 ± 0·03b | |
15 % PEG | Monastir | 4·98 ± 0·27a | 0·29 ± 0·07a | 84·9 ± 0·7a | 70·2 ± 0·5bc | 0·11 ± 0·02c | 0·49 ± 0·03c |
Sbikha | 5·05 ± 0·15a | 0·45 ± 0·02b | 83·1 ± 1·1a | 74·5 ± 1·7b | 0·12 ± 0·02c | 0·52 ± 0·05c |
Measurements were performed on fully expanded leaves. Each value is the mean of six replicates ± s.e. of the means. For a given parameter and a given time, values sharing a common superscript letter are not significantly different at P < 0·05.