Morphology and germination of Acmella oleracea L. R. Jansen under different temperatures and photoperiods

Sarmento, Erivanessa Costa Sousa; Pereira, Kleane Targino Oliveira; Oliveira, Fernando Sarmento de; Leal, Caio César Pereira; Torres, Salvador Barros; Dutra, Alek Sandro

doi:10.5935/1806-6690.20190078

Cited by 2 publications

(1 citation statement)

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“…The pericarp of Asteraceae cypselae is not adnate to the seed (Frangiote-Pallone and Souza, 2014), and it is water permeable (e.g. Kagaya et al, 2005;Genna and Pérez, 2016;Yuan and Wen, 2018;Sarmento et al, 2019;Zhang et al, 2019). Furthermore, the large well-developed embryo is spatulate in shape, and endosperm is not present in mature cypselae (Martin, 1946;Lubbock, 1892Lubbock, [1978).…”

Section: Introductionmentioning

confidence: 99%

Seed dormancy in Asteraceae: a global vegetation zone and taxonomic/phylogenetic assessment

Baskin

2023

Seed Sci. Res.

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The Asteraceae with up to 30,000 species occurs on all continents except Antarctica and in all major vegetation zones on earth. Our primary aim was to consider cypselae dormancy-break and germination of Asteraceae in relation to ecology, vegetation zones and evolution. Cypselae are desiccation-tolerant and in various tribes, genera, species and life forms of Asteraceae are either non-dormant (ND) or have non-deep physiological dormancy (PD) at maturity. All six types of non-deep PD are found among the Asteraceae, and dormancy is broken by cold or warm stratification or by afterripening. Soil cypselae banks may be formed but mostly are short-lived. Much within-species variation in dormancy-break and germination has been found. Using data compiled for 1192 species in 373 genera and 35 tribes of Asteraceae, we considered ND and PD in relation to life form, vegetation zone and tribe. Senecioneae and Astereae had the best representation across the vegetation zones on earth. In evergreen and semi-evergreen rainforests, more species have ND than PD, but in all other vegetation zones, except alpine/high-latitude tundra (where ND and PD are equal), more species have PD than ND. Tribes in the basal and central grades and those in the Heliantheae Alliance have both ND and PD. The high diversity and lability of non-deep PD may have enhanced the rate of species diversification by promoting the survival of new species and/or species in new habitats that became available following globally disruptive events since the origin of the Asteraceae in the Late Cretaceous.

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