Variable tolerance of wetland tree species to combined salinity and waterlogging is related to regulation of ion uptake and production of organic solutes

Carter, Jennifer L.; Colmer, Timothy D.; Veneklaas, Erik J.

doi:10.1111/j.1469-8137.2005.01552.x

Cited by 81 publications

(60 citation statements)

References 46 publications

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“…The lowest values of Pc (0.1 mg g -1 FW for wheat and 0.05 mg g -1 FW for bean) are observed at the lowest salinity level at 6 kPa matric suction. The decrease in Pc with aeration improvement has been observed by many researchers (Carter et al, 2006). The Pc increases with matric suctions between 6 and 10 kPa and then remains nearly constant, for both crops.…”

Section: Resultsmentioning

confidence: 88%

Some physiological responses of wheat and bean to soil salinity at low matric suctions

Khatar

Mohammadi

Shekari

2017

International Agrophysics

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A b s t r a c t. The effect of soil matric suction (2-33 kPa) and salinity (soil solution electrical conductivity 0.7-8 dS m -1 for bean and 2-20 dS m -1 for wheat) on some physiological characteristics of bean and wheat in a clay loam soil under greenhouse condition was investigated. The results showed that the leaf chlorophyll content index and potassium concentration decrease under salinity stress and increase with matric suction from 2 to 33 kPa suction for both plants. The wheat chlorophyll content index declines during the stress spell but bean chlorophyll content index remains nearly constant. The lowest values of the content of soluble sugars and the highest values of leaf proline content are observed at 2 kPa matric suction (highest aeration stress) for bean and wheat. As matric suction increases from 2 to 6 kPa, the soluble sugars increases and proline content decreases significantly and then soluble sugars decreases and proline content increases until 10 kPa suction, and the soluble sugars remains nearly constant at the higher matric suctions for both plants. While the electrical conductivity effect on the soluble sugars is not significant, the values of proline content for both crop increase significantly with electrical conductivity. It was shown that the aeration stress can result in more considerable and rapid physiological responses, in comparison with salinity stress. There is a strong correlation between wheat and bean chlorophyll content index and potassium concentration under salinity and aeration stresses.K e y w o r d s:

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Section: Resultsmentioning

confidence: 88%

Some physiological responses of wheat and bean to soil salinity at low matric suctions

Khatar

Mohammadi

Shekari

2017

International Agrophysics

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“…Water and salt stress have profound effects on plant survival (Ladiges et al 1981, Munns and Termaat 1986, Munns 2002, Carter et al 2006, Salter et al 2008) and species composition (James et al 2003, Nielsen et al 2003, Smith et al 2009). Importantly, the nature of the relationship between plant survival and species composition with increasing salinization often conforms to a sigmoidal model (Carpenter 2003, Davis et al 2003.…”

Section: Discussionmentioning

confidence: 99%

Managing natural resources for their human values

et al. 2015

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Abstract. Species composition and structure are important properties that can influence the extent to which people value a natural element. Hence these two properties can provide a means to directly manage natural elements to meet values-based goals. With this principle in mind, we studied soil seed bank assembly in two wetland vegetation elements recognized for their science/education, opportunity and system benefit values. Because seed banks drive the composition and structure associated with a vegetation element, which in turn influence human value satisfaction, variance partitioning modeling was used to determine which combination of filters best described patterns in the seed bank beta diversity. A combination of abiotic (soil permeability and soil salinity) and spatial filters with several interactions were the best descriptors of beta diversity, particularly for one vegetation element (wetland 1). Within the remaining vegetation element (wetland 2), a much greater diversity of weed species was observed. Based on the different patterns in diversity, including the links between these patterns, particular filters, and associated processes, we propose that the two vegetation elements, despite their close proximity to each other, are on diverging reassembly pathways. To manage the vegetation elements such that they maintain their values, we suggest hydrological processes are controlled to ensure that soil salinity does not increase dramatically. Dramatic increases in salinity will decrease element value by reducing vegetation diversity and plant community structure. We also stress the importance of understanding and managing processes that effect within-element dispersal and invasion by weeds. Here we demonstrate a general approach to inform the management of natural resources. It is important to identify, understand, and manage the filters (and associated processes) that restrict observable patterns in the properties that influence element value, sensu rules to manage the human valuation of natural elements.

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“…By analyzing the accumulation of proline analogues in leaves of 125 Melaleuca species, Naidu et al (2000) showed a possible relationship between salt tolerance and the kinds and number of different proline analogues plants accumulate. Furthermore, Carter et al (2005) suggested that the salt-induced accumulation of methyl proline in M. cuticularis is sufficient to provide osmotic balance in the cytoplasm, consequently contributing to salt tolerance. Under salt stress, the decrease in OP with an accumulation of organic osmoprotectants such as proline is one Refer to the footnote in Table 2 mechanism by which plant cells uptake water and thus maintain cell turgor (Neumann et al 1988).…”

Section: Effects Of the Interaction Between Al And Naclmentioning

confidence: 98%

Provenance variation in tolerance of Melaleuca cajuputi trees to interactive effects of aluminum and salt

Nguyen

Saneoka

Suwa

et al. 2009

Trees

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A future rise in sea level will expand areas of salt-affected acid sulfate soil, calling for studies on plant tolerance to combined aluminum (Al) and salt (NaCl) stress. We investigated random amplified polymorphic DNA (RAPD) profiles and tolerance to Al and NaCl alone and in combination in 14 Melaleuca cajuputi Powell provenances. Two-month-old seedlings were grown with or without 10 mM Al and/or 50 mM NaCl at pH 3.8 for 3 months. Plant growth was reduced mostly by combined Al and NaCl stress and then by NaCl and least by Al. Moreover, Al enhanced the effect of NaCl on growth and vice versa. There were significant differences in plant growth among provenances under all treatments; however, positive relationships were found among Al tolerance, NaCl tolerance, and combined Al and NaCl tolerance. Provenance variation in stress tolerance increases with the increasing levels of stress effect. Furthermore, NaCl tolerance tended to have a positive relationship with osmotic potential. Leaf sap K concentration was decreased by NaCl and increased by Al; however, provenances that were more tolerant to NaCl tended to have lower K concentrations. RAPD analysis also revealed genetic variation among provenances. These results suggest that the low tolerance to combined Al and NaCl stress in M. cajuputi is largely due to low tolerance to NaCl and the effect of interaction between Al and NaCl. Provenance variation in stress tolerance was significant and could be partly explained by the variation in genetic material and the ability of plants to reduce ion excess stress in their shoots.

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Variable tolerance of wetland tree species to combined salinity and waterlogging is related to regulation of ion uptake and production of organic solutes

Cited by 81 publications

References 46 publications

Some physiological responses of wheat and bean to soil salinity at low matric suctions

Some physiological responses of wheat and bean to soil salinity at low matric suctions

Managing natural resources for their human values

Provenance variation in tolerance of Melaleuca cajuputi trees to interactive effects of aluminum and salt

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