Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity
Tall wheatgrass (<i>Thinopyrum ponticum</i> (Podp.) Barkworth and D.R. Dewey) is an important, highly salt-tolerant C3 forage grass. The objective of this work was to learn about the ecophysiological responses of accessions from different environmental origins under drought and salinity...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-06-01
|
| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/11/12/1548 |
| _version_ | 1797483120382967808 |
|---|---|
| author | Celina I. Borrajo Adela M. Sánchez-Moreiras Manuel J. Reigosa |
| author_facet | Celina I. Borrajo Adela M. Sánchez-Moreiras Manuel J. Reigosa |
| author_sort | Celina I. Borrajo |
| collection | DOAJ |
| description | Tall wheatgrass (<i>Thinopyrum ponticum</i> (Podp.) Barkworth and D.R. Dewey) is an important, highly salt-tolerant C3 forage grass. The objective of this work was to learn about the ecophysiological responses of accessions from different environmental origins under drought and salinity conditions, to provide information for selecting superior germplasm under combined stress in tall wheatgrass. Four accessions (P3, P4, P5, P9) were irrigated using combinations of three salinity levels (0, 0.1, 0.3 M NaCl) and three drought levels (100%, 50%, 30% water capacity) over 90 days in a greenhouse. The control treatment showed the highest total biomass, but water-use efficiency (WUE), δ<sup>13</sup>C, proline, N concentration, leaf length, and tiller density were higher under moderate drought or/and salinity stress than under control conditions. In tall wheatgrass, K<sup>+</sup> functions as an osmoregulator under drought, attenuated by salinity, and Na<sup>+</sup> and Cl<sup>−</sup> function as osmoregulators under salinity and drought, while proline is an osmoprotector under both stresses. P3 and P9, from environments with mild/moderate stress, prioritized reproductive development, with high evapotranspiration and the lowest WUE and δ<sup>13</sup>C values. P4 and P5, from more stressful environments, prioritized vegetative development through tillering, showing the lowest evapotranspiration, the highest δ<sup>13</sup>C values, and different mechanisms for limiting transpiration. The δ<sup>13</sup>C value, leaf biomass, tiller density, and leaf length had high broad-sense heritability (H<sup>2</sup>), while the Na<sup>+</sup>/K<sup>+</sup> ratio had medium H<sup>2</sup>. In conclusion, the combined use of the δ<sup>13</sup>C value, Na<sup>+</sup>/K<sup>+</sup> ratio, and canopy structural variables can help identify accessions that are well-adapted to drought and salinity, also considering the desirable plant characteristics. Tall wheatgrass stress tolerance could be used to expand forage production under a changing climate. |
| first_indexed | 2024-03-09T22:42:25Z |
| format | Article |
| id | doaj.art-3d4fd0d8ccc346aab2a55e0756b79f3b |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-09T22:42:25Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-3d4fd0d8ccc346aab2a55e0756b79f3b2023-11-23T18:34:24ZengMDPI AGPlants2223-77472022-06-011112154810.3390/plants11121548Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and SalinityCelina I. Borrajo0Adela M. Sánchez-Moreiras1Manuel J. Reigosa2Departamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Universidade de Vigo, Campus Lagoas Marcosende s/n, 36310 Vigo, SpainDepartamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Universidade de Vigo, Campus Lagoas Marcosende s/n, 36310 Vigo, SpainDepartamento de Bioloxía Vexetal e Ciencias do Solo, Facultade de Bioloxía, Universidade de Vigo, Campus Lagoas Marcosende s/n, 36310 Vigo, SpainTall wheatgrass (<i>Thinopyrum ponticum</i> (Podp.) Barkworth and D.R. Dewey) is an important, highly salt-tolerant C3 forage grass. The objective of this work was to learn about the ecophysiological responses of accessions from different environmental origins under drought and salinity conditions, to provide information for selecting superior germplasm under combined stress in tall wheatgrass. Four accessions (P3, P4, P5, P9) were irrigated using combinations of three salinity levels (0, 0.1, 0.3 M NaCl) and three drought levels (100%, 50%, 30% water capacity) over 90 days in a greenhouse. The control treatment showed the highest total biomass, but water-use efficiency (WUE), δ<sup>13</sup>C, proline, N concentration, leaf length, and tiller density were higher under moderate drought or/and salinity stress than under control conditions. In tall wheatgrass, K<sup>+</sup> functions as an osmoregulator under drought, attenuated by salinity, and Na<sup>+</sup> and Cl<sup>−</sup> function as osmoregulators under salinity and drought, while proline is an osmoprotector under both stresses. P3 and P9, from environments with mild/moderate stress, prioritized reproductive development, with high evapotranspiration and the lowest WUE and δ<sup>13</sup>C values. P4 and P5, from more stressful environments, prioritized vegetative development through tillering, showing the lowest evapotranspiration, the highest δ<sup>13</sup>C values, and different mechanisms for limiting transpiration. The δ<sup>13</sup>C value, leaf biomass, tiller density, and leaf length had high broad-sense heritability (H<sup>2</sup>), while the Na<sup>+</sup>/K<sup>+</sup> ratio had medium H<sup>2</sup>. In conclusion, the combined use of the δ<sup>13</sup>C value, Na<sup>+</sup>/K<sup>+</sup> ratio, and canopy structural variables can help identify accessions that are well-adapted to drought and salinity, also considering the desirable plant characteristics. Tall wheatgrass stress tolerance could be used to expand forage production under a changing climate.https://www.mdpi.com/2223-7747/11/12/1548tiller densityleaf length13-carbon isotopewater-use efficiencyNa<sup>+</sup>/K<sup>+</sup> ratioproline |
| spellingShingle | Celina I. Borrajo Adela M. Sánchez-Moreiras Manuel J. Reigosa Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity Plants tiller density leaf length 13-carbon isotope water-use efficiency Na<sup>+</sup>/K<sup>+</sup> ratio proline |
| title | Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity |
| title_full | Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity |
| title_fullStr | Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity |
| title_full_unstemmed | Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity |
| title_short | Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity |
| title_sort | ecophysiological responses of tall wheatgrass germplasm to drought and salinity |
| topic | tiller density leaf length 13-carbon isotope water-use efficiency Na<sup>+</sup>/K<sup>+</sup> ratio proline |
| url | https://www.mdpi.com/2223-7747/11/12/1548 |
| work_keys_str_mv | AT celinaiborrajo ecophysiologicalresponsesoftallwheatgrassgermplasmtodroughtandsalinity AT adelamsanchezmoreiras ecophysiologicalresponsesoftallwheatgrassgermplasmtodroughtandsalinity AT manueljreigosa ecophysiologicalresponsesoftallwheatgrassgermplasmtodroughtandsalinity |