Salixspecies variation in leaf gas exchange, sodium, and nutrient parameters at three levels of salinity
| Autor: | John E. Major, Alex Mosseler, John W. Malcolm |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Global and Planetary Change Ecology 020209 energy Sodium INT chemistry.chemical_element Forestry 02 engineering and technology Biology Photosynthesis biology.organism_classification 01 natural sciences Salinity Salix discolor Animal science Nutrient Dry weight chemistry Botany 0202 electrical engineering electronic engineering information engineering Water-use efficiency 010606 plant biology & botany |
| Zdroj: | Canadian Journal of Forest Research. 47:1045-1055 |
| ISSN: | 1208-6037 0045-5067 |
| DOI: | 10.1139/cjfr-2017-0028 |
| Popis: | Leaf gas exchange, Na+, and nutrient parameters were quantified under control (CTL), medium (MST), and high (HST) saline treatments for Salix discolor Muhl. (DIS), Salix eriocephala Michx. (ERI), and Salix interior Rowlee (INT). Net photosynthesis (Pn) increased from CTL to MST for all species but remained unchanged between MST and HST for surviving INT plants in HST. Salix interior had greater water-use efficiency (WUE) than DIS and ERI. Under CTL, INT had 13× the leaf Na+concentration of DIS and ERI, but INT Na+only increased by 17% across each saline treatment, whereas DIS and ERI leaf Na+increased 6.0× from CTL to MST. Salix discolor and ERI had greater cation to Na+ratios than INT; however, INT ratios were stable across saline treatments, whereas the DIS and ERI ratios dropped precipitously. Across species and treatments, Pnhad a significant positive relationship to total aboveground dry mass, supporting the sink regulation of Pntheory. Also, Pnshowed a significant positive relationship to WUE and leaf N and to leaf Na+, which probably reflects greater energy expenditure required to mitigate the higher levels of Na+. The saline tolerance of INT may be due to natural selection pressure in the arid regions of the southwestern United States, where it is believed to have its evolutionary origins. |
| Databáze: | OpenAIRE |
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