Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved
IntroductionThe use of drought tolerant genotypes is one of the main strategies proposed for coping with the negative effects of global warming in dry lands. Trichloris crinita is a native forage grass occupying extensive arid and semi-arid regions in the American continent, and used for range grazi...
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Frontiers Media S.A.
2023-08-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2023.1235923/full |
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| author | Deolindo Luis Esteban Dominguez Juan Bruno Cavagnaro Juana Panasiti Ros Anh Tuan Le Yong Suk Chung Pablo Federico Cavagnaro Pablo Federico Cavagnaro |
| author_facet | Deolindo Luis Esteban Dominguez Juan Bruno Cavagnaro Juana Panasiti Ros Anh Tuan Le Yong Suk Chung Pablo Federico Cavagnaro Pablo Federico Cavagnaro |
| author_sort | Deolindo Luis Esteban Dominguez |
| collection | DOAJ |
| description | IntroductionThe use of drought tolerant genotypes is one of the main strategies proposed for coping with the negative effects of global warming in dry lands. Trichloris crinita is a native forage grass occupying extensive arid and semi-arid regions in the American continent, and used for range grazing and revegetation of degraded lands.MethodsTo identify drought-tolerant genotypes and possible underlying physiological mechanisms, this study investigated drought tolerance in 21 genetically diverse T. crinita genotypes under natural field conditions. The accessions were grown under irrigated (control) and drought conditions for 84 days after initiation of the drought treatment (DAIDT), which coincided with flowering initiation. Various morpho-physiological traits were monitored, including total-, foliage-, and root biomass yield, dry matter partitioning to individual plant organs (roots, leaves, stems, and panicles), total leaf area, chlorophyll content, photochemical efficiency of photosystem II, stomatal conductance, and number of panicles per plant.Results and discussionBroad and significant variation (p<0.001) was found among the accessions for all the traits. Three highly tolerant and three very sensitive accessions were identified as the most contrasting materials, and their responses to drought stress were confirmed over two years of experiments. Under prolonged drought conditions (84 DAIDT), the tolerant accessions were generally more productive than the rest for all the biomass yield components analyzed, and this was associated with a postponed and more attenuated decrease in variables related to the plant photosynthetic activity, such as stomatal conductance, chlorophyll content, and photochemical efficiency. In contrast to previous findings, our data indicate no direct relationship between drought tolerance and the level of aridity in the accessions natural habitats, but rather suggest genetic heterogeneity and ample variation for drought tolerance in T. crinita natural populations derived from a particular location or environment. Also, having low total and forageable biomass yield, or increased biomass allocation to the roots (i.e., lower foliage/root ratio), under optimal water availability, were not associated with greater drought tolerance. The drought-tolerant accessions identified are of value for future genetic research and breeding programs, and as forage for range grazing and revegetation in arid regions. |
| first_indexed | 2024-03-12T17:43:32Z |
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| id | doaj.art-4f2f680451de41ee9d2d80f64097c2dd |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-03-12T17:43:32Z |
| publishDate | 2023-08-01 |
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| series | Frontiers in Plant Science |
| spelling | doaj.art-4f2f680451de41ee9d2d80f64097c2dd2023-08-03T20:30:25ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2023-08-011410.3389/fpls.2023.12359231235923Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involvedDeolindo Luis Esteban Dominguez0Juan Bruno Cavagnaro1Juana Panasiti Ros2Anh Tuan Le3Yong Suk Chung4Pablo Federico Cavagnaro5Pablo Federico Cavagnaro6Instituto de Biología Agrícola de Mendoza (IBAM), Facultad de Ciencias Agrarias, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo, Lujan de Cuyo, Mendoza, ArgentinaInstituto de Biología Agrícola de Mendoza (IBAM), Facultad de Ciencias Agrarias, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo, Lujan de Cuyo, Mendoza, ArgentinaFacultad de Ciencias Agrarias, Universidad Nacional de Cuyo, Lujan de Cuyo, Mendoza, ArgentinaDepartment of Plant Resources and Environment, Jeju National University, Jeju, Republic of KoreaDepartment of Plant Resources and Environment, Jeju National University, Jeju, Republic of KoreaFacultad de Ciencias Agrarias, Universidad Nacional de Cuyo, Lujan de Cuyo, Mendoza, ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA) Agricultural Experimental Station Mendoza (EEA Mendoza), Lujan de Cuyo, Mendoza, ArgentinaIntroductionThe use of drought tolerant genotypes is one of the main strategies proposed for coping with the negative effects of global warming in dry lands. Trichloris crinita is a native forage grass occupying extensive arid and semi-arid regions in the American continent, and used for range grazing and revegetation of degraded lands.MethodsTo identify drought-tolerant genotypes and possible underlying physiological mechanisms, this study investigated drought tolerance in 21 genetically diverse T. crinita genotypes under natural field conditions. The accessions were grown under irrigated (control) and drought conditions for 84 days after initiation of the drought treatment (DAIDT), which coincided with flowering initiation. Various morpho-physiological traits were monitored, including total-, foliage-, and root biomass yield, dry matter partitioning to individual plant organs (roots, leaves, stems, and panicles), total leaf area, chlorophyll content, photochemical efficiency of photosystem II, stomatal conductance, and number of panicles per plant.Results and discussionBroad and significant variation (p<0.001) was found among the accessions for all the traits. Three highly tolerant and three very sensitive accessions were identified as the most contrasting materials, and their responses to drought stress were confirmed over two years of experiments. Under prolonged drought conditions (84 DAIDT), the tolerant accessions were generally more productive than the rest for all the biomass yield components analyzed, and this was associated with a postponed and more attenuated decrease in variables related to the plant photosynthetic activity, such as stomatal conductance, chlorophyll content, and photochemical efficiency. In contrast to previous findings, our data indicate no direct relationship between drought tolerance and the level of aridity in the accessions natural habitats, but rather suggest genetic heterogeneity and ample variation for drought tolerance in T. crinita natural populations derived from a particular location or environment. Also, having low total and forageable biomass yield, or increased biomass allocation to the roots (i.e., lower foliage/root ratio), under optimal water availability, were not associated with greater drought tolerance. The drought-tolerant accessions identified are of value for future genetic research and breeding programs, and as forage for range grazing and revegetation in arid regions.https://www.frontiersin.org/articles/10.3389/fpls.2023.1235923/fullLeptochloa crinitadrought stressphotoassimilates partitioningbiomassstomatal conductancephotochemical efficiency |
| spellingShingle | Deolindo Luis Esteban Dominguez Juan Bruno Cavagnaro Juana Panasiti Ros Anh Tuan Le Yong Suk Chung Pablo Federico Cavagnaro Pablo Federico Cavagnaro Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved Frontiers in Plant Science Leptochloa crinita drought stress photoassimilates partitioning biomass stomatal conductance photochemical efficiency |
| title | Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved |
| title_full | Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved |
| title_fullStr | Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved |
| title_full_unstemmed | Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved |
| title_short | Genetic diversity for drought tolerance in the native forage grass Trichloris crinita and possible morpho-physiological mechanisms involved |
| title_sort | genetic diversity for drought tolerance in the native forage grass trichloris crinita and possible morpho physiological mechanisms involved |
| topic | Leptochloa crinita drought stress photoassimilates partitioning biomass stomatal conductance photochemical efficiency |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2023.1235923/full |
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