Genetic and environmental variation of seed weight in <i>Trichloris</i> species (Chloridoideae, Poaceae) and its association with seedling stress tolerance

Marinoni, Lorena del Rosario; Zabala, Juan Marcelo; Parra‐Quijano, Mauricio; Fernández, Roberto; Pensiero, José F.

doi:10.1080/17550874.2018.1449262

Cited by 10 publications

(17 citation statements)

References 51 publications

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“…crinita . Genetically based differences in adaptations to environmental factors were found between populations [ 60 – 62 ]. In addition, overgrazing by cattle may limit the distribution of the species [ 63 ] while the presence of certain arbuscular mycorrhizal fungi may favor it [ 64 ].…”

Section: Discussionmentioning

confidence: 99%

Climatic niche shift in the amphitropical disjunct grass Trichloris crinita

2018

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Plant species disjunctions have attracted the interest of ecologists for decades. We investigated Trichloris crinita, a native C4 perennial grass with disjunct distribution between subtropical regions of North and South America, testing the hypothesis that the species has a similar realized climatic niche in both subcontinents. The climatic niche of T. crinita in North and South America was characterized and compared using presence records and five uncorrelated bioclimatic variables selected according to their ecological importance for the species. We used reciprocal modeling to make geographic projections of the realized niche within each subcontinent. Niche overlap between T. crinita distributions in North and South America was intermediate for the individual climatic variables and the multivariate space. In all cases the test of equivalence between climates inhabited by T. crinita indicated that the realized niche of the species differ significantly between subcontinents. Also, the similarity test showed that in the majority of cases the realized niche in both subcontinents was significantly different than that expected by chance. T. crinita occupied a greater diversity of environments in South than in North America, while in the latter its distribution was displaced to drier and warmer environments. The modeled geographic distribution using the actual occurrences of the species in North America did not accurately predict the distribution in South America, and vice versa. Together, these results led us to reject the hypothesis of similar niche of T. crinita in both subcontinents. This information may be useful to manage restoration efforts by presenting the suitable areas and climates for the species, and suggesting that translocation of individuals between subcontinents could only be recommended with caution because introduced genotypes can be potentially maladaptive, and could colonize sites actually not occupied by the species within each subcontinent.

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Section: Discussionmentioning

confidence: 99%

Climatic niche shift in the amphitropical disjunct grass Trichloris crinita

2018

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“…Therefore, lines reflect adaptation to local environment and can be considered as an ecotype. Previous studies performed in the populations where ecotypes were obtained revealed adaptive differences in seed traits and germination (Marinoni 2017;Marinoni et al 2018). Each ecotype used in the present study was randomly selected from the original population.…”

Section: Plant Materialsmentioning

confidence: 99%

“…For salinity stress simulation, the nutrient solution contained 7 g L -1 NaCl (120 mM) and was kept at 3 cm from the bottom of the pots along the experiment, as in the control treatment. This salinity concentration was used by Marinoni et al (2018) to obtain differential responses at the germination stage in populations of both Trichloris species. Salt and drought treatments started when seedlings had 2-3 completely expanded leaves and continued for 30 days.…”

Section: Experimental Designmentioning

confidence: 99%

Differential response of Trichloris ecotypes from different habitats to drought and salt stress

Marinoni

Richard

Bustos³

et al. 2020

Theor. Exp. Plant Physiol.

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Native plant genetic resources have evolved from long processes of natural selection and adaptation to specific environments, and have developed tolerance to various stresses prevailing in their natural habitats via adaptive morphophysiological features. The associations between environmental stress conditions (aridity degree and salinity) prevailing in the original habitat of Argentine native Trichloris species (T. crinita and T. pluriflora) and various biometric and physiological traits were evaluated. Trials were carried out in hydroponics in a growth chamber. Components of initial plant growth, oxidative stress expression and antioxidant activity under drought and salt stress were measured in ecotypes of both species, as well as Na ? and K ? leaf tissue concentration and excretion rates under salinity. Ecotypes from arid and semiarid origin of both species had higher drought tolerance. Regarding salt stress, T. crinita ecotype from alkali soil showed stimulated growth under salinity and an ecotype from saline soil kept high root and shoot biomass production. Although the ecotypes of T. pluriflora were not significantly salt-sensitive, none stood out. Many active salt glands on the abaxial leaf surface, high Na/K excretion ratio and high leaf tissue concentration of sodium were found for salt-tolerant ecotypes. This study identified ecotypes with tolerance to prevailing stressful conditions of natural habitat of native forage species to be introduced to plant breeding programmes for restorations purposes. Trichloris pluriflora is an unexplored genetic resource for semiarid rangeland, thus this study is the first report of drought tolerant ecotypes.

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“…In the last decade, five cultivars were registered in the Instituto Nacional de Semillas (INASE), although there are no commercial seeds currently available. The selection criteria in these breeding programmes were biomass and seed production and drought tolerance level (Kozub et al, 2017) along with the further advancement in the selection of salt-tolerant germplasm (Marinoni, 2017;Marinoni, Zabala, Parra-Quijano, Fernández, & Pensiero, 2018).…”

Section: Species Of the Generamentioning

confidence: 99%

Wild halophytic species as forage sources: Key aspects for plant breeding

Marinoni

Zabala

Taleisnik

et al. 2019

Grass and Forage Science

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The use of wild halophytic species as forage resources in saline environments has gained increasing attention. Argentina ranks third in area of saline soils in the world, with a third of its territory showing various degrees of salinity, sodicity and/or alkalinity. On this type of soils, rangelands are the main forage resource for livestock production. Many wild species have forage potential and can also be used for the rehabilitation of rangelands and for intercropping. Information about these species, as well as on the physiological and genetic bases associated with salinity tolerance, provides relevant tools for efficient selection methods. This study addresses Argentine wild halophyte species with forage potential and describes selection criteria with an emphasis on the following taxa: (a) Poaceae: subfamily Chloridoideae and tribes Paniceae and Triticeae, (b) Fabaceae and (c) Amaranthaceae (formerly known as Chenopodiaceae). The review is intended to contribute to the general discussion on strategies for the improvement of wild plant genetic resources, using forage species naturally growing in saline soils in Argentina as a case study.

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Genetic and environmental variation of seed weight in Trichloris species (Chloridoideae, Poaceae) and its association with seedling stress tolerance

Cited by 10 publications

References 51 publications

Climatic niche shift in the amphitropical disjunct grass Trichloris crinita

Climatic niche shift in the amphitropical disjunct grass Trichloris crinita

Differential response of Trichloris ecotypes from different habitats to drought and salt stress

Wild halophytic species as forage sources: Key aspects for plant breeding

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