Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave
Desert shrubs are keystone species for plant diversity and ecosystem function. <i>Atriplex clivicola</i> and <i>Atriplex deserticola</i> (Amaranthaceae) are native shrubs from the Atacama Desert that show contrasting altitudinal distribution (<i>A. clivicola</i>:...
| المؤلفون الرئيسيون: | , , , , , |
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| التنسيق: | مقال |
| اللغة: | English |
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MDPI AG
2023-06-01
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| سلاسل: | Plants |
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| الوصول للمادة أونلاين: | https://www.mdpi.com/2223-7747/12/13/2464 |
| _version_ | 1827734665334620160 |
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| author | Enrique Ostria-Gallardo Estrella Zúñiga-Contreras Danny E. Carvajal Teodoro Coba de La Peña Ernesto Gianoli Luisa Bascuñán-Godoy |
| author_facet | Enrique Ostria-Gallardo Estrella Zúñiga-Contreras Danny E. Carvajal Teodoro Coba de La Peña Ernesto Gianoli Luisa Bascuñán-Godoy |
| author_sort | Enrique Ostria-Gallardo |
| collection | DOAJ |
| description | Desert shrubs are keystone species for plant diversity and ecosystem function. <i>Atriplex clivicola</i> and <i>Atriplex deserticola</i> (Amaranthaceae) are native shrubs from the Atacama Desert that show contrasting altitudinal distribution (<i>A. clivicola</i>: 0–700 m.a.s.l.; <i>A. deserticola</i>: 1500–3000 m.a.s.l.). Both species possess a C4 photosynthetic pathway and Kranz anatomy, traits adaptive to high temperatures. Historical records and projections for the near future show trends in increasing air temperature and frequency of heat wave events in these species’ habitats. Besides sharing a C4 pathway, it is not clear how their leaf-level physiological traits associated with photosynthesis and water relations respond to heat stress. We studied their physiological traits (gas exchange, chlorophyll fluorescence, water status) before and after a simulated heat wave (HW). Both species enhanced their intrinsic water use efficiency after HW but via different mechanisms. <i>A. clivicola</i>, which has a higher LMA than <i>A. deserticola</i>, enhances water saving by closing stomata and maintaining RWC (%) and leaf Ψ<sub>md</sub> potential at similar values to those measured before HW. After HW, <i>A. deserticola</i> showed an increase of A<sub>max</sub> without concurrent changes in g<sub>s</sub> and a significant reduction of RWC and Ψ<sub>md</sub>. <i>A. deserticola</i> showed higher values of Chl<i>a</i> fluorescence after HW. Thus, under heat stress, <i>A. clivicola</i> maximizes water saving, whilst <i>A. deserticola</i> enhances its photosynthetic performance. These contrasting (eco)physiological strategies are consistent with the adaptation of each species to their local environmental conditions at different altitudes. |
| first_indexed | 2024-03-11T01:31:46Z |
| format | Article |
| id | doaj.art-df985e4388ed43b5a27f169d34be9b25 |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-11T01:31:46Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-df985e4388ed43b5a27f169d34be9b252023-11-18T17:17:50ZengMDPI AGPlants2223-77472023-06-011213246410.3390/plants12132464Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat WaveEnrique Ostria-Gallardo0Estrella Zúñiga-Contreras1Danny E. Carvajal2Teodoro Coba de La Peña3Ernesto Gianoli4Luisa Bascuñán-Godoy5Laboratory of Plant Physiology, Center of Advanced Studies in Arid Zones (CEAZA), La Serena 1700000, ChileLaboratory of Plant Physiology, Center of Advanced Studies in Arid Zones (CEAZA), La Serena 1700000, ChileLaboratory of Plant Ecophysiology, Department of Biology, Universidad de La Serena, La Serena 1700000, ChileLaboratory of Phytorremediation, Center of Advanced Studies in Arid Zones (CEAZA), La Serena 1700000, ChileLaboratory of Functional Ecology, Department of Biology, Universidad de La Serena, La Serena 1700000, ChileLaboratory of Plant Physiology, Department of Botany, Universidad de Concepción, Concepción 4030000, ChileDesert shrubs are keystone species for plant diversity and ecosystem function. <i>Atriplex clivicola</i> and <i>Atriplex deserticola</i> (Amaranthaceae) are native shrubs from the Atacama Desert that show contrasting altitudinal distribution (<i>A. clivicola</i>: 0–700 m.a.s.l.; <i>A. deserticola</i>: 1500–3000 m.a.s.l.). Both species possess a C4 photosynthetic pathway and Kranz anatomy, traits adaptive to high temperatures. Historical records and projections for the near future show trends in increasing air temperature and frequency of heat wave events in these species’ habitats. Besides sharing a C4 pathway, it is not clear how their leaf-level physiological traits associated with photosynthesis and water relations respond to heat stress. We studied their physiological traits (gas exchange, chlorophyll fluorescence, water status) before and after a simulated heat wave (HW). Both species enhanced their intrinsic water use efficiency after HW but via different mechanisms. <i>A. clivicola</i>, which has a higher LMA than <i>A. deserticola</i>, enhances water saving by closing stomata and maintaining RWC (%) and leaf Ψ<sub>md</sub> potential at similar values to those measured before HW. After HW, <i>A. deserticola</i> showed an increase of A<sub>max</sub> without concurrent changes in g<sub>s</sub> and a significant reduction of RWC and Ψ<sub>md</sub>. <i>A. deserticola</i> showed higher values of Chl<i>a</i> fluorescence after HW. Thus, under heat stress, <i>A. clivicola</i> maximizes water saving, whilst <i>A. deserticola</i> enhances its photosynthetic performance. These contrasting (eco)physiological strategies are consistent with the adaptation of each species to their local environmental conditions at different altitudes.https://www.mdpi.com/2223-7747/12/13/2464<i>Atriplex</i>Atacama DesertC4 pathwaydesert shrubsheat wavegas exchange |
| spellingShingle | Enrique Ostria-Gallardo Estrella Zúñiga-Contreras Danny E. Carvajal Teodoro Coba de La Peña Ernesto Gianoli Luisa Bascuñán-Godoy Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave Plants <i>Atriplex</i> Atacama Desert C4 pathway desert shrubs heat wave gas exchange |
| title | Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave |
| title_full | Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave |
| title_fullStr | Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave |
| title_full_unstemmed | Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave |
| title_short | Two Congeneric Shrubs from the Atacama Desert Show Different Physiological Strategies That Improve Water Use Efficiency under a Simulated Heat Wave |
| title_sort | two congeneric shrubs from the atacama desert show different physiological strategies that improve water use efficiency under a simulated heat wave |
| topic | <i>Atriplex</i> Atacama Desert C4 pathway desert shrubs heat wave gas exchange |
| url | https://www.mdpi.com/2223-7747/12/13/2464 |
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