Germination response of diverse wild and landrace chile peppers (Capsicum spp.) under drought stress simulated with polyethylene glycol
| Autor: | Kristin L. Mercer, Lev Jardón Barbolla, Vivian Bernau, Leah K. McHale |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Germplasm
Physiology Plant Science Plant Reproduction Geographical locations Polyethylene Glycols Plant Resistance to Abiotic Stress Seed Germination education.field_of_study Multidisciplinary biology Ecology Plant Anatomy food and beverages Eukaryota Plants Adaptation Physiological Droughts Horticulture Germination Plant Physiology Seeds Ecozone Medicine Capsicum Research Article Drought Adaptation Science Population Fruits Surface-Active Agents Stress Physiological Plant-Environment Interactions Pepper Osmotic Shock Animals Domestic Animals Plant Defenses Domestication education Mexico Local adaptation Chile (Country) Plant Ecology fungi Ecology and Environmental Sciences Organisms Biology and Life Sciences Cell Biology South America Plant Pathology biology.organism_classification Seedling North America People and places Zoology |
| Zdroj: | PLoS ONE PLoS ONE, Vol 15, Iss 11, p e0236001 (2020) |
| ISSN: | 1932-6203 |
| Popis: | Responses to drought within a single species may vary based on plant development stage, drought severity, and the avoidance or tolerance mechanisms employed. Early drought stress can restrict emergence and seedling growth. Thus, in areas where water availability is limited, rapid germination leading to early plant establishment may be beneficial. Alternatively, germination without sufficient water to support the seedling may lead to early senescence, so reduced germination under low moisture conditions may be adaptive at the level of the population. We studied the germination response to osmotic stress of diverse chile pepper germplasm collected in southern Mexico from varied ecozones, cultivation systems, and of named landraces. Drought stress was simulated using polyethylene glycol solutions. Overall, survival time analysis revealed delayed germination at the 20% concentration of PEG across all ecozones. The effect was most pronounced in the genotypes from hotter, drier ecozones. Additionally, accessions from wetter and cooler ecozones had the fastest rate of germination. Moreover, accessions of the landraces Costeño Rojo and Tusta germinated more slowly and incompletely if sourced from a drier ecozone than a wetter one, indicating that slower, reduced germination under drought stress may be an adaptive avoidance mechanism. Significant differences were also observed between named landraces, with more domesticated types from intensive cultivation systems nearly always germinating faster than small-fruited backyard- or wild-types, perhaps due to the fact that the smaller-fruited accessions have generally undergone less selection. Thus, we conclude that there is evidence of local adaptation to both ecozone of origin and source cultivation system in germination characteristics of diverse chile peppers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|