Acorn weight as determinant of germination in red and white oaks: evidences from a common-garden greenhouse experiment
In Mexican oaks, germination increases with acorn fresh weight across oak species. Within species, these relationships are stronger in red oaks than in white oaks. In both oak groups, fresh weight of acorns increases with their dry biomass.
Mexican oaks are phylogenetically grouped in red and white oaks. White oaks produce heavier acorns than red ones, but no studies have assessed whether this leads to different germination patterns.
This study was aimed to determine the influence of the fresh weight of acorns on their germination.
Acorns of red and white oaks were hydrated, weighed, and sowed under greenhouse conditions to assess whether their fresh weight was related with germination. We also assessed whether fresh weight of acorns was related with their dry biomass and/or water accumulation capability.
Hydrated acorns of white oaks were heavier and germinated faster than those of red oaks. Germination percentages increased with acorn fresh weight across oak species. Within species, germination probability increased with acorn fresh weight, but these relationships were more marked in red oaks. Germination speed decreased with acorn fresh weight in red oaks, but these relationships were not found in white oaks. Fresh weight was positively related with acorn dry biomass in all oak species, but it was not related with water content.
Increasing acorn fresh weight enhances germination across oak species. Within species, however, this trait seems to have more influence in red than in white oaks.
KeywordsLobatae Logistic regressions Mexico Quercus Seed size
We thank the support of JP Rodas-Ortiz during the collection of acorns and the measurements performed in the laboratory. We also thank the valuable comments of the editors of the journal, which strongly contributed to improve the earlier versions of the manuscript. Erik J. Sánchez-Montes de Oca thanks the doctoral fellowship of Consejo Nacional de Ciencia y Tecnología de Mexico (no. 150830) and Lilia E. Silva-Alvarado thanks the fellowship provided by project SEP-CONACYT CB-2013/221623.
Compliance with ethical standards
Conflict of interest
The authors state there are no conflicts of interests of any nature.
- Burslem D, Miller J (2001) Seed size, germination and seedling relative growth rates in three tropical tree species. J Trop For Sci 13:148–161Google Scholar
- Chacón P, Bustamante R, Henriquez C (1998) The effect of seed size on germination and seedling growth of Cryptocarya alba (Lauraceae) in Chile. Rev Chil Hist Nat 71:189–197Google Scholar
- García-Sánchez F, Aguirre-Rivera JR (2011) Guía de campo para la identificación de los árboles de sierra de Álvarez, SLP. Universidad Autónoma de San Luis Potosí, MéxicoGoogle Scholar
- Gómez JM (2004) Bigger is not always better: conflicting selective pressures on seed size in Quercus ilex. Evolution 58(1):71–80. https://doi.org/10.1111/j.0014-3820.2004.tb01574.x CrossRefPubMedGoogle Scholar
- González-Salvatierra C, Badano EI, Flores J, Rodas JP (2013) Germination, infestation, and viability in acorns of Quercus polymorpha (Schltdl. & Cham.) after 1-year storage. Rev Chapingo Ser Cienc For Ambient 19:351–362Google Scholar
- Gribko LS, Jones WE (1995) Test of the float method of assessing northern red oak acorn condition. Tree Planters’ Notes 46:143–147Google Scholar
- Khan M, Shankar U (2001) Effect of seed weight, light regime and substratum microsite on germination and seedling growth of Quercus semiserrata Roxb. Trop Ecol 42:117–125Google Scholar
- Purohit VK, Tamta S, Nandi SK, Rikhari HC, Palni LMS (2003) Does acorn weight influence germination and subsequent seedling growth of central Himalayan oaks? J Trop Forest Sci 15:483–492Google Scholar
- R Foundation (2016) R, a language and environment for statistical computing. Vienna, Austria. Available from: https://www.r-project.org
- Ramos-Palacios CR, Badano EI, Flores J, Flores-Cano JA, Flores-Flores JL (2014) Distribution patterns of acorns after primary dispersion in a fragmented oak forest and their consequences on predators and dispersers. Eur J For Res 133(3):391–404. https://doi.org/10.1007/s10342-013-0771-5 CrossRefGoogle Scholar
- Roach DA, Wulff RD (1987) Maternal effects in plants. Ann Rev Ecol Syst 18(1):209–235. https://doi.org/10.1146/annurev.es.18.110187.001233 CrossRefGoogle Scholar
- Romero-Rangel S, Rojas-Zenteno EC, Rubio-Licona LE (2014) Fagaceae. Flora del Bajío y de regiones adyacentes 181:1–167Google Scholar
- Rubio-Licona LE, Romero-Rangel S, Rojas-Zenteno EC, Durán-Díaz A, Gutiérrez-Guzmán JC (2011) Variación del tamaño de frutos y semillas en siete especies de encino (Quercus, Fagaceae). Polibotánica 32:135–151Google Scholar
- Valencia AS (2004) Diversidad del género Quercus (Fagaceae) en México. Bol Soc Bot Mex 75:33–53Google Scholar
- Zar JH (2010) Biostatistical analysis, 5th edn. Pearson, New JerseyGoogle Scholar
- Zavala-Chávez F (2001) Introducción a la ecología de la regeneración natural de encinos. Universidad Autonoma Chapingo, MéxicoGoogle Scholar
- Zavala-Chávez F (2004) Desecación de bellotas y su relación con la viabilidad y germinación en nueve especies de encinos mexicanos. Ciencia Ergo Sum 11:177–185Google Scholar
- Zavala-Chávez F (2008) Efecto del almacenamiento sobre la viabilidad y germinación de bellotas de Quercus rugosa y Quercus grabrescens. Rev Sci For Mex 33:15–25Google Scholar
- Zavala-Chávez F, García-Moya E (1996) Frutos y semillas de encinos. Universidad Autónoma Chapingo, MéxicoGoogle Scholar