Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico
Background and Aims: Precocious (viviparous) seed germination in fruits of Stenocereus thurberi has been correlated with higher germination rate of the remaining seeds. This study compares the germination of five populations from Sinaloa, Mexico, to determine: 1) whether there is a pattern associate...
| Auteurs principaux: | , , , , , |
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| Format: | Online |
| Langue: | spa |
| Publié: |
Instituto de Ecología, A.C.
2018
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| Accès en ligne: | https://abm.ojs.inecol.mx/index.php/abm/article/view/1250 |
| _version_ | 1799771328029392896 |
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| author | Casillas Álvarez, Pedro Reyes Olivas, Alvaro Sánchez-Soto, Bardo Heleodoro García Moya, Edmundo Lugo-García, Gabriel Antonio Soto-Hernández, Ramón Marcos |
| author_facet | Casillas Álvarez, Pedro Reyes Olivas, Alvaro Sánchez-Soto, Bardo Heleodoro García Moya, Edmundo Lugo-García, Gabriel Antonio Soto-Hernández, Ramón Marcos |
| author_sort | Casillas Álvarez, Pedro |
| collection | ABM |
| description | Background and Aims: Precocious (viviparous) seed germination in fruits of Stenocereus thurberi has been correlated with higher germination rate of the remaining seeds. This study compares the germination of five populations from Sinaloa, Mexico, to determine: 1) whether there is a pattern associated with precocious seed germination and, 2) how much the viviparous phenomenon accounts for germination compared to variation between fruits, individuals and populations of the cactus.Methods: The incidence of vivipary was recorded in 194 plants, and seeds were separated into four putative sources of variance: populations, reproductive categories (VV: viviparous, NV: non-viviparous), individuals within categories and fruits within individuals. The seed germination response in percentage (PGF), mean time (TMG), rate (VG), and synchrony of germination (SG) was evaluated under a randomized complete blocks scheme with three replicates, in experimental units of 25 seeds. Data were analyzed with hierarchical ANOVAs for a linear mixed model.Key results: Reproductive categories accounted for 5-11% of variance and showed significant differences in favor of viviparous phenotypes, with PGF of 35 vs 19% and 91 vs 72%, VG of 1.5 vs 0.5 and 7.9 vs 5.4 seeds/day, and SG of 0.3 vs 0.1, 0.7 vs 0.5 and 0.8 vs 0.6. Buenavista and Tosalibampo populations showed higher percentage, rate and synchrony of germination than the other populations (P<0.05, Student t-test).Conclusions: There is a seed germination pattern associated to vivipary in S. thurberi. The variance accounted by this condition depends on the environment in which seed maturation and germination occur. The seeds from viviparous phenotypes showed higher germination vigor than seeds from non-viviparous plants, revealing potential for seedling recruitment and population growth under drought and salinity stress. |
| format | Online |
| id | oai:oai.abm.ojs.inecol.mx:article-1250 |
| institution | Acta Botanica Mexicana |
| language | spa |
| publishDate | 2018 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | oai:oai.abm.ojs.inecol.mx:article-12502022-11-17T22:48:50Z Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico Germinación diferencial asociada con viviparidad facultativa en Stenocereus thurberi (Cactaceae): correlaciones climáticas en poblaciones marginales de Sinaloa, México Casillas Álvarez, Pedro Reyes Olivas, Alvaro Sánchez-Soto, Bardo Heleodoro García Moya, Edmundo Lugo-García, Gabriel Antonio Soto-Hernández, Ramón Marcos climatic gradient maternal effect nested analysis precocious germination análisis anidado efectos maternos germinación precoz gradiente climático Background and Aims: Precocious (viviparous) seed germination in fruits of Stenocereus thurberi has been correlated with higher germination rate of the remaining seeds. This study compares the germination of five populations from Sinaloa, Mexico, to determine: 1) whether there is a pattern associated with precocious seed germination and, 2) how much the viviparous phenomenon accounts for germination compared to variation between fruits, individuals and populations of the cactus.Methods: The incidence of vivipary was recorded in 194 plants, and seeds were separated into four putative sources of variance: populations, reproductive categories (VV: viviparous, NV: non-viviparous), individuals within categories and fruits within individuals. The seed germination response in percentage (PGF), mean time (TMG), rate (VG), and synchrony of germination (SG) was evaluated under a randomized complete blocks scheme with three replicates, in experimental units of 25 seeds. Data were analyzed with hierarchical ANOVAs for a linear mixed model.Key results: Reproductive categories accounted for 5-11% of variance and showed significant differences in favor of viviparous phenotypes, with PGF of 35 vs 19% and 91 vs 72%, VG of 1.5 vs 0.5 and 7.9 vs 5.4 seeds/day, and SG of 0.3 vs 0.1, 0.7 vs 0.5 and 0.8 vs 0.6. Buenavista and Tosalibampo populations showed higher percentage, rate and synchrony of germination than the other populations (P<0.05, Student t-test).Conclusions: There is a seed germination pattern associated to vivipary in S. thurberi. The variance accounted by this condition depends on the environment in which seed maturation and germination occur. The seeds from viviparous phenotypes showed higher germination vigor than seeds from non-viviparous plants, revealing potential for seedling recruitment and population growth under drought and salinity stress. Antecedentes y Objetivos: La germinación precoz (vivípara) de semillas en frutos de Stenocereus thurberi se ha correlacionado con mayor velocidad de germinación de las semillas remanentes. Esta investigación compara la germinación de cinco poblaciones de Sinaloa, México, para determinar: 1) si existe un patrón asociado con la germinación precoz de las semillas y 2) cuánto contribuye el fenómeno vivíparo a la germinación, dada la variación entre frutos, individuos y poblaciones de esta especie.Métodos: Se revisó el nivel de viviparidad de 194 plantas y se separaron las semillas en cuatro probables fuentes de varianza: poblaciones, categorías reproductivas (VV: vivíparas y NV: no vivíparas), plantas dentro de categorías y frutos dentro de plantas. Las respuestas de germinación final (PGF), tiempo medio (TMG), velocidad (VG) y sincronía de germinación (SG) se evaluaron en bloques al azar con tres repeticiones, en unidades experimentales de 25 semillas. Los datos se analizaron con ANOVA’s jerárquicos bajo un modelo lineal mixto.Resultados clave: Las categorías reproductivas explicaron 5-11% de la varianza y mostraron diferencias significativas a favor de las vivíparas, con PGF de 35 vs 19% y 91 vs 72%, VG de 1.5 vs 0.5 y 7.9 vs 5.4 semillas/día, y SG de 0.3 vs 0.1, 0.7 vs 0.5 y 0.8 vs 0.6. Las poblaciones de Buenavista y Tosalibampo tuvieron mayor porcentaje, velocidad y sincronía de germinación (prueba t de Student, P<0.05) que las otras poblaciones.Conclusiones: Existe un patrón de germinación asociado con viviparidad en S. thurberi. La varianza asociada con esta condición depende del ambiente de maduración y germinación de las semillas. Los fenotipos vivíparos germinaron con mayor vigor que los no vivíparos, mostrando potencial para apoyar la incorporación de individuos y el crecimiento de la población en condiciones de estrés hídrico y salino. Instituto de Ecología, A.C. 2018-02-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion artículo evaluado por pares application/pdf text/html application/xml https://abm.ojs.inecol.mx/index.php/abm/article/view/1250 10.21829/abm123.2018.1250 Acta Botanica Mexicana; No. 123 (2018); 51-66 Acta Botanica Mexicana; Núm. 123 (2018); 51-66 2448-7589 0187-7151 spa https://abm.ojs.inecol.mx/index.php/abm/article/view/1250/pdf https://abm.ojs.inecol.mx/index.php/abm/article/view/1250/html https://abm.ojs.inecol.mx/index.php/abm/article/view/1250/1545 Derechos de autor 2018 Acta Botanica Mexicana https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | Casillas Álvarez, Pedro Reyes Olivas, Alvaro Sánchez-Soto, Bardo Heleodoro García Moya, Edmundo Lugo-García, Gabriel Antonio Soto-Hernández, Ramón Marcos Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title | Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title_full | Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title_fullStr | Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title_full_unstemmed | Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title_short | Differential germination associated with facultative vivipary in Stenocereus thurberi (Cactaceae): climatic correlations in marginal populations in Sinaloa, Mexico |
| title_sort | differential germination associated with facultative vivipary in stenocereus thurberi (cactaceae): climatic correlations in marginal populations in sinaloa, mexico |
| url | https://abm.ojs.inecol.mx/index.php/abm/article/view/1250 |
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