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Longevity and Germination of Syagrus Romanzoffiana (Arecaceae) Seeds and Its Ecological Implications

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Longevity and Germination of Syagrus Romanzoffiana (Arecaceae) Seeds and Its Ecological Implications Longevity and germination of Syagrus romanzoffiana (Arecaceae) seeds and its ecological implications Túlio Gabriel Soares Oliveira1, Anderson Cleiton José2, Leonardo Monteiro Ribeiro3 & José Marcio Rocha Faria2 1. Universidade Federal de Minas Gerais, Departamento de Botânica, Laboratório de Fisiologia Vegetal, Av. Presidente Antônio Carlos, 6627, Belo Horizonte, Brasil; [email protected] 2. Universidade Federal de Lavras, Departamento de Ciências Florestais, Laboratório de Sementes Florestais, Campus Universitário, Lavras, Brasil; [email protected], [email protected] 3. Universidade Estadual de Montes Claros, Departamento de Biologia Geral, Laboratório de Micropropagação, Campus Universitário Professor Darcy Ribeiro, Montes Claros, Brasil; [email protected] Received 13-VIII-2014. Corrected 08-XI-2014. Accepted 04-XII-2014. Abstract: Syagrus romanzoffiana is a palm tree native and widely distributed of South America. The present study investigated the longevity and germination of the buried seeds of this species in an experimental seed bank. Laboratory germination and viability tests were performed for comparison with field results. Pyrenes (seeds enclosed by the endocarp) were buried in a forest fragment edge in July 2012 (dry season) and exhumed monthly during one year, for the assessment of water content and percentage of germinated and viable seeds. Germination tests were conducted in a Mangelsdorf-type germinator at 30°C under constant light and the viabil- ity was assessed by the tetrazolium test. An additional sample of pyrenes was buried to evaluate the percentage of seedling emergence and survival. Climatic and soil moisture data were recorded. In the laboratory, the pyrenes were stored for one year in a temperature-controlled room at 20ºC and 75% (±10%) relative air humidity to assess changes in the percentage of germination and viability over time. In the field, a reduction in seed viability was observed over the study period, with a total loss of viability of non-germinated seeds at seven months after burial. The maximum germination (close to 26%) was observed in the samples that were exhumed between five and seven months after burial. In the field, seedling emergence did not exceed 10% and seedling mortality was not observed. The percentages of germination and of viable seeds decreased both in burial and stored seeds. The stored seeds maintained viability at up to six months, with marked reduction thereafter. After the germination tests (four months) in the laboratory, all of the remaining seeds were nonviable. The ecological, physiological and reproductive characteristics of the species are discussed, and we concluded that S. romanzoffiana seeds have short longevity after imbibition, and low potential for soil seed bank formation. Rev. Biol. Trop. 63 (2): 333-340. Epub 2015 June 01. Key words: palm tree, queen palm, viability, seed bank, seed storage. The longevity or ability to preserve seed at certain time intervals to determine their viability is essential for the formation of a viability (Baskin, & Baskin, 2006; 2014). persistent soil seed bank (Thompson, 1997), Syagrus romanzoffiana (queen palm) is which plays a decisive role in the adaptation a native palm tree that is widely distributed of species to different environments (Baskin, in South America (Lorenzi, Souza, Medeiros- & Baskin, 2014; Long et al., 2015). Because of Costa, Cerqueira, & Behr, 1996). In Brazil, the peculiarities in different habitats, the most this species is found in several phytophys- accurate method of assessing seed longevity is iognomies that have significant differences to bury them in the ground and remove samples related to climate and vegetation structure Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 63 (2): 333-340, June 2015 333 and include subtropical forests, dry forests, processes must be determined to understand Brazilian savanna (Cerrado), Atlantic Forest the dynamics of plant populations, however, and Restinga (Guix, & Ruiz, 2000; Brancalion, there is little information in the literature on Novembre, & Rodrigues, 2011). The queen these approaches (Vázquez-Yanes & Orozco- palm produces fleshy fruits and is an ecologi- Segovia, 1993). In the present study, we sought cally important species because of its interac- to assess changes in the germination, viability tion with frugivorous birds and mammals that and water content of S. romanzoffiana seeds also act as seed dispersers (Giombini, Bravo, & in natural and laboratory conditions to deter- Martínez, 2009). mine the following: i) are there differences in Studies have reported low germination the longevity of laboratory stored and buried percentages for S. romanzoffiana seeds in the seeds? ii) does the species form a persistent laboratory (Broschat, & Donselman, 1987; seed bank? and iii) does the behavior of seeds Brancalion et al., 2011; Goudel, Shibata, Coel- in the bank explain the reproductive success of ho, & Miller, 2013), suggesting that the seeds the species? have a certain degree of dormancy. The pres- ence of dormancy and the ability to form MATERIALS AND METHODS persistent seed banks are adaptive strategies of plant species to overcome unfavorable periods Collection and processing of seeds: Ripe for germination and/or seedling establishment fruits, which are characterized by an orange (Moles, Warton, & Westoby, 2003; Long et color, were collected in July 2012 immediately al., 2015). Although the presence of dormancy after natural abscission from eighteen individu- may contribute to the formation of a persistent als of S. romanzoffiana present at the campus seed bank as a result of maintenance of viabil- of the Federal University of Lavras (Universi- ity (Jensen, 2004), certain studies have shown dade Federal de Lavras-UFLA), Minas Gerais that there is no a close relationship between State, Brazil. The fruits were immediately dormancy and persistence in the seed bank placed in sealed plastic bags and left under (Thompson, Ceriani, Bakker, & Bekker, 2003; shade for five days to soften the pulp. The Honda, 2008). fruits were then depulped using a vertical Under natural conditions, S. romanzoffiana electric depulper device to obtain the pyrenes seeds are dispersed within the fruit structures. (endocarp+seed), which were then transported After the pulp (mesocarp) is consumed, a to the Laboratory of Forest Seeds/UFLA to woody endocarp remains enclosing the seed carry out the experiments. that forms a germination unit called pyrene. The presence of fruit structures (such as the Initial characterization of the seeds: endocarp) restricts germination in certain palm To assess the germination, the pyrenes (four tree seeds by imposing a mechanical barrier for replicates of 25) were surface sterilized in germination (Broschat, 1998; Ribeiro, Souza, a 3% sodium hypochlorite solution for ten Rodrigues-Jr, Oliveira, & Garcia, 2011; Neves minutes, rinsed in tap water and sown in et al., 2013). Moreover, these structures may polyethylene trays containing autoclaved sand play an important ecological role, especially in a Mangelsdorf-type germinator at 30°C in the prevention of water loss and protec- under constant light. Seedling emergence was tion against predation, thus contributing to an used as the germination criterion, and it was increase in seed longevity (Orozco-Segovia, evaluated weekly for four months to calculate Batis, Roja-Aréchiga, & Mendoza, 2003; Hu, the final germination percentage (%G). The Wang, & Wu, 2009). water content of the seeds after removing the The longevity of seeds, their mechanisms endocarp was determined by the oven method of dormancy, germination in the field and the at 105ºC for 24h (Ministério da Agricultura, effects of environmental conditions on these Pecuária e Abastecimento, Brasil, 2009) using 334 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 63 (2): 333-340, June 2015 four replicates of five seeds. The isolated seeds UFLA Meteorological Station, which is located were obtained after breaking the pyrenes in a approximately 1km from the study site. manual vise. The initial viability was deter- mined by the 0.5% tetrazolium test according Storage of pyrenes: Pyrenes containing to the method for the macaw palm (Acroco- seeds with a water content of 18% were stored mia aculeata) described by Ribeiro, Garcia, in polyethylene bags (semipermeable) in a Oliveira & Neves (2010) using four replicates temperature-controlled room at 20ºC and 75% of ten embryos. (±10%) relative air humidity. The %G, viability by the tetrazolium test, and seed water content Seed behavior in an experimental bank: were determined after 3, 6 and 12 months of Pyrenes whose seeds had 18% of water con- storage. Germination was assessed as previ- tent were buried in at the border of a forest ously described. fragment at UFLA to simulate the natural dispersion and formation of seed banks of this Data analysis: The percentage data were species. The pyrenes were placed in polyeth- transformed to arcsine and subjected to the ylene nets (one for each sample point) with Shapiro-Wilk normality test. An analysis of 1cm mesh and covered by 3cm of soil from variance was performed, and the Scott-Knott the study area. The experiment consisted of 12 test was used at 5% probability. samples of 260 pyrenes, which were sampled monthly during one year (between July 2012 RESULTS and July 2013) to assess germination percent- age (four replicates of 40 pyrenes), viability Seed behavior in an experimental bank: (four replicates of 15 pyrenes) and seed
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