dc.contributor.author | Ghasemi, Rasoul | |
dc.contributor.author | Rajakaruna, Nishanta | |
dc.contributor.author | Chavoshi, Zohreh Zare | |
dc.contributor.author | Boyd, Robert S. | |
dc.date.accessioned | 2016-09-13T08:09:01Z | |
dc.date.available | 2016-09-13T08:09:01Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Ghasemi, R. et al. 2015. Calcium : magnesium ratio affects environmental stress sensitivity in the serpentine-endemic Alyssum inflatum (Brassicaceae). Australian journal of botany, 63(2):39–46. [http://www.publish.csiro.au/nid/65.htm] | en_US |
dc.identifier.issn | 0067–1924 | |
dc.identifier.issn | 1444–9862 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/18672 | |
dc.identifier.uri | http://dx.doi.org/10.1071/BT14235 | |
dc.identifier.uri | http://www.publish.csiro.au/nid/65/paper/BT14235.htm | |
dc.description.abstract | Plants endemic to serpentine soils are adapted to harsh environmental conditions typical of those soils, particularly, low (<1) calcium (Ca) : magnesium (Mg) ratios. We compared survival of two perennial Alyssum species native to Iran under experimental manipulations of Ca : Mg ratio, including when Ca : Mg ratio was varied under conditions of high ammonium concentration and heat stress. Alyssum inflatum is a serpentine endemic capable of nickel (Ni) hyperaccumulation, whereas A. lanceolatum is found on non-serpentine soils and is not known to hyperaccumulate Ni. We grew plants of both species under four Ca : Mg ratios (0.4, 2, 20, 40) and tested survival when plants were exposed to elevated ammonium levels (0, 1 and 4 mM) and heat stress (control conditions vs a 5-h 36°C treatment daily for 5 days). Alyssum lanceolatum was more tolerant of Ca : Mg ratio variation (100% survival in all treatments), whereas A. inflatum survival was maximum at Ca : Mg = 2, reduced at Ca : Mg = 0.4, and very low for Ca : Mg ratios of 20 and 40. Alyssum lanceolatum also tolerated ammonium and heat stress, whereas survival of A. inflatum declined at higher Ca : Mg ratios when subjected to both stresses. We conclude that at higher Ca : Mg ratios, the serpentine endemic has reduced tolerance for these environmental stresses and may be more susceptible to human-driven climate change-associated stressors than the non-serpentine species | en_US |
dc.language.iso | en | en_US |
dc.publisher | CSIRO Publishing | en_US |
dc.subject | Global climate change | en_US |
dc.subject | heat stress | en_US |
dc.subject | local adaptation | en_US |
dc.subject | nitrogen deposition | en_US |
dc.subject | serpentine endemism | en_US |
dc.title | Calcium : magnesium ratio affects environmental stress sensitivity in the serpentine-endemic Alyssum inflatum (Brassicaceae) | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 24678104 - Rajakaruna, Nishanta | |