Census, reproductive biology, and germination of Astragalus gines-lopezii (Fabaceae), a narrow and endangered endemic species of SW Spain

Martínez-Fernández, Vanesa; Martínez-García, Felipe; Pérez-García, Francisco J.

doi:10.3906/bot-1310-14

Cited by 16 publications

(19 citation statements)

References 38 publications

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“…The experiments showed a positive effect of mechanical scarification on seed germination, because this method increased the percentage of germinating seeds to 100%. It is in totally agreement with results obtained for A. gines-lopezii [7] and A. siliquosus [13] for which scarification with sandpaper significantly enhanced seed germination. Physical scarification turned out to be the best method of breaking dormancy also for A. arpilobus [14] and A. cicer [12].…”

Section: Discussionsupporting

confidence: 91%

“…There are several methods for breaking physical dormancy revised by Rolston [5]. Dormancy and germination of seeds from the genus Astragalus has been studied in some rare and endangered species, e.g., A. adsurgens [6], A. gines-lopezii [7], A. nitidiflorus [8], A. maritimus, and A. verrucosus [9] due to the fact that it is crucial for their reproduction, ex situ conservation and reintroduction.…”

Section: Introductionmentioning

confidence: 99%

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Breaking seed dormancy of Astragalus penduliflorus Lam.

2019

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Astragalus penduliflorus Lam. is an alpine-subalpine species. Several isolated populations occur in Europe: in the Alps, Pyrenees, Carpathians and in central Sweden. Astragalus penduliflorus is considered as critically endangered species in Poland, growing only at the locality in the Smytnia Valley, in the Western Tatra Mountains. The population is at risk, due to the limited reproduction caused by law rate of seed germination, periodically shortened vegetation period that prevent seed development and gnawing the aerial plant parts by deer. The aim of the study was to explain the reason for the poor germination of A. penduliflorus seeds. As a result of mechanical scarification, 100% of A. penduliflorus seeds germinated, which proved that these seeds are characterized by a water-impermeable seed coat, which classified them as hard seeds that go through physical dormancy. Results obtained in this work can be used for effective reproduction and active conservation of threatened A. penduliflorus.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Breaking seed dormancy of Astragalus penduliflorus Lam.

2019

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“…However, since the seeds were stored for 1 year before they were tested for germination it is not known if fresh seeds were dormant or non-dormant. The results of Ramos et al (2010) do not agree with those of Martínez-Fernández et al (2014), who compared dormancy/germination of the only two known populations of A. gines-lopezii . They found that mechanical scarification increased mean germination from 27 to 95% in the Andres population and from 30 to 91% in the Calera population.…”

Section: Resultsmentioning

confidence: 79%

A meta-analysis of the effects of treatments used to break dormancy in seeds of the megagenusAstragalus(Fabaceae)

Soltani

Baskin

et al. 2020

Seed Sci. Res.

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Astragalus is the largest genus of seed plants with 3000 or more species that occurs naturally on several continents. The genus has some use as a forage and medicine and in industry, and many of the species are rare endemics threatened with extinction. The seeds are reported to be dormant at maturity, and various treatments have been used in an attempt to germinate them. Our primary aim was to determine via a meta-analysis the most effective way(s) to break dormancy in seeds of this species-rich genus. Mechanical and chemical (conc. sulphuric acid) scarification were by far the best of 12 treatments for breaking seed dormancy of the 40 species included in our meta-analysis, whereas prechilling, gibberellin and smoke were ineffective. These results along with those of imbibition tests confirm that seeds of the examined Astragalus species have physical dormancy (PY). Further, PY in these 40 species and (its documented occurrence) in 118 species that could not be included in our meta-analysis transcends climatic and geographic boundaries, edaphic conditions, life cycle/life form types and infrageneric phylogeny. Thus, it seems likely that most species of Astragalus have PY. However, in addition to PY, physiological dormancy (PD), that is, combinational dormancy (PY + PD), has been reported in a few species of Astragalus. This study should be useful to both basic and applied scientists who want to germinate seeds of Astragalus.

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“…Great intra-population variability in germination has been detected in several wild Mediterranean species, such as Erica australis (Cruz et al ., 2003), Ceratonia siliqua (Pérez-García, 2009), Astragalus gines-lopezii (Martínez-Fernández et al ., 2014), Senecio coiincyi (Martínez-García et al ., 2012), Gentiana lutea (Pérez-García et al ., 2012), and several species of Cistaceae (Pérez-García, 1997; Tavşanoğlu and Çatav, 2012). In the Mediterranean climate, with variable and unpredictable environmental conditions, an important survival strategy of wild species would be variation in either germination requirements (Kigel, 1995; Cruz et al ., 2003; Pérez-García et al ., 2003; Pérez-García, 2005; Pérez-García et al ., 2006; Pérez-García and González-Benito, 2012; Pérez-García et al ., 2012; Baskin and Baskin, 2014; Copete et al ., 2014; Martínez-Fernández et al ., 2014), seed dormancy (Pérez-García et al ., 2012), seed longevity (Mira et al ., 2011a; Lazar et al ., 2014; Mira et al ., 2015a) or seed characteristics (Pérez-García et al ., 2006; Mira et al ., 2011b; Pérez-García and González-Benito, 2012). In nature, P. angustifolia flowering takes place in March to June, fruits ripen in September to October and are dispersed from September to March.…”

Section: Discussionmentioning

confidence: 99%

Habitat-correlated seed germination and morphology in populations of Phillyrea angustifolia L. (Oleaceae)

2017

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The broad aim of this work was to study intraspecific variation of seed germination in Phillyrea angustifolia L. (Oleaceae), a species with a hard (water-permeable) endocarp. Germination of seeds from six different wild populations was correlated with traits related either to seed morphology or to environmental parameters. Germination of naked seeds (seeds without endocarp) at the optimum germination conditions was similar among populations and individuals, but great differences could be detected regarding the germination of seeds with endocarp both at inter- and intra-populational levels. Differences among populations could be related to climatic parameters and to morphometric variables of seeds with endocarp. A higher germination was associated with populations growing in habitats with more severe summer (higher temperature, lower precipitation and a longer drought period) and producing elongated seeds (lower Feret ratio and roundness). Moreover, seeds from eight different individuals within a population were tested independently, and great differences regarding the germination of seeds with endocarp could be detected among individuals. Our results suggest that the morphological variation found in P. angustifolia endocarp is both under strong maternal genetic control as well as influenced by environmental factors, as indicated by the high variability among individuals within one population and the significant correlation between climate variables and seed germination among populations. Finally, it is emphasized that standardization of plant propagation protocols should take into account the degree of intraspecific variation of Mediterranean species.

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Census, reproductive biology, and germination of Astragalus gines-lopezii (Fabaceae), a narrow and endangered endemic species of SW Spain

Cited by 16 publications

References 38 publications

Breaking seed dormancy of Astragalus penduliflorus Lam.

Breaking seed dormancy of Astragalus penduliflorus Lam.

A meta-analysis of the effects of treatments used to break dormancy in seeds of the megagenusAstragalus(Fabaceae)

Habitat-correlated seed germination and morphology in populations of Phillyrea angustifolia L. (Oleaceae)

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