Relationship between salt tolerance and proline accumulation in Australian acacia species

Abstract

The effects of salinity on the seedlings of five acacia species, Acacia ampliceps, A. salicina, A. ligulata, A. holosericea, and A. mangium were studied with respect to mortality, growth, and proline accumulation. There was marked variation among the species in their response to salinity. A. ampliceps showed the highest level of salt tolerance among the five acacia species. In contrast, A. holosericea and A. mangium were classified as the least tolerant. The concentration which caused 100% mortality in 2-week-old seedlings during 1 week of treatment was 2.5% (w/v) and 1.5% NaCl for A. ampliceps and A. holosericea, respectively. The dry weights of whole plant of two acacia species decreased markedly under the above salt stress conditions. Proline accumulation was found in leaves and roots after NaCl treatment. The maximum level of proline accumulation in A. holosericea was about twice as great as that in A. ampliceps throughout the stress period. Thus, the level of proline accumulation was not related to the degree of salt tolerance in these acacia species, although a positive correlation between the extent of salt stress and the accumulation of proline was found.

Effect Of Sodium Nitro-Prusside( Snp) Pretreatment on Ammonia Assimilating Enzymes of Salt Stressed Tomato Leaves (Lycopersicon esculentum)

“…Total protein (TP) and insoluble protein (InsP) fractions were significantly decreaed in NaClstressed leaves (Table 1), this was accompanied with an increase of SP, SP/TP and proline contents (Table 3). These results are consistent with the findings of other authors (Sairam et al, 2002;Yokota, 2003;Sumithra et al, 2006 andHossain et al, 2012). In contrast, Hossain et al (2012) have reported that SP content in tomato plants was markedly decreased under salt stress.…”

Effect of salt stress on genetic diversity of Robinia pseudoacacia seedlings

“…(Nawaz et al, 2010), and as a result inhibit seed germination and seedlings plant growth (Jamil et al, 2006;Basalah, 2010). Though it has been noted that trees can still tolerate salinity to a certain extent when compared with agricultural field crops (Niazi et al, 1985;Ali et al, 1987), our result further confirms that seed germination, growth and survival of trees are still sensitive to salinity at their seedling stage (Ramoliya and Pandey, 2002;Yokota, 2003;Parsons, 2004).…”

Functional Diversity of Mycorrhizal Fungi Has Differential Effects on Salinity Tolerance of <i>Acacia seyal</i> (Del.) Seedlings

“…The plants of the acacia family appear to have the potential to grow in salty soils [39], with considerable differences in sensitivity to salt stress among species [40] [41]. The tolerance of a plant to salt stress, linked to its genetic potential, could [53] noted that the growth of the shoot parts of tomato was increased by inoculation with AMF from non-saline areas and was inhibited by inoculation with AMF from saline areas.…”