The Families of the Monocotyledons. Structure, Evolution and Taxonomy

Dransfield, John; Dahlgren, Rolf; Clifford, H. T.; Yeo, P. F.; Faden, Robert B.; Jacobsen, N. Kingo; Jacobsen, Kim; Jensen, Søren Rosendal; Nielsen, Bent; Rasmussen, Folke

doi:10.2307/4109916

Cited by 110 publications

(3 citation statements)

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“…We demonstrated that diaspores of P. chiquitensis do not present any type of primary dormancy, although they have a time-staggered germination. This contradicts previous reports about these diaspores (Dransfield et al, 1987;Kraus et al, 1996;Sá-Carvalho & Ribeiro, 1994a) and opens a window to discuss dormancy. Only diaspores having low values of germinability and high values of characters involved in time, uniformity, synchronization and uncertainty of germination should be related to some type of dormancy (Ranal, Santana, & Schiavini, 2010).…”

Section: Discussioncontrasting

confidence: 77%

“…Diaspore dormancy of species of the genus Paepalanthus has been linked to physiological and/or morphological variations (Dransfield et al, 1987; Kraus et al, 1996; Sá‐Carvalho & Ribeiro, 1994a) that can be studied through hormonal supplementation with GA 3 or by means of potassium nitrate exposure or thermal exposure (also called “heat shock” or dry heat shock) using the oven method (Baskin & Baskin, 1998; Brasil, 2009; Sá‐Carvalho & Ribeiro, 1994a). The effect of exposure to nominal temperatures (mean ± standard deviation [ SD ]; n = 30) of 35°C (34.7 ± 1.1°C), 40°C (41.2 ± 1.2°C), 50°C (49.5 ± 1.3°C), 60°C (59.6 ± 2.4°C) and 70°C (67.6 ± 1.1°C) on the germination was analyzed by exposing the diaspores for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…These individuals were capable of generating diaspores with high potential for germination in light (i.e., diaspores are photoblastic), which not only gives us hope for the success of restoration programs requiring the species, but also makes them viable for use as a biological model in the laboratory. However, there are also reports that diaspores of Eriocaulaceae species are regarded as dormant due to an immature or undifferentiated embryo (Dransfield et al, 1987; Kraus, Scatena, Lewinger, & Trench, 1996), that is, morphological dormancy (Nikolaeva, 1977). Thus, even with the contribution of recent articles to the elucidation of factors related to dormancy and germination of diaspores of species endemic to biodiversity hotspots, such as those of the genus Paepalanthus (Dayrell et al, 2017; Sá‐Carvalho & Ribeiro, 1994a and their references), there are still gaps regarding the germination–dormancy balance.…”

Section: Introductionmentioning

confidence: 99%

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Misunderstanding on germination sensu stricto leads us to a false positive germination‐dormancy balance in diaspores of Paepalanthus chiquitensis Herzog (Eriocaulaceae), a threatened everlasting flowering species

Gonçalves-Magalhães

Santana

Ribeiro‐Oliveira

2021

Plant Species Biology

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Although germination sensu stricto and germination–dormancy balance are essential to each other, few reports demonstrate the effects of their relationship on patterns of seed–seedling transition. We studied this relationship by using diaspores of Paepalanthus chiquitensis, a threatened everlasting flowering species. We assessed three aspects: (a) water dynamics in germinating diaspores, (b) thermal stimulation (35, 40, 50, 60 and 70°C for 30 min) and (c) imbibition (4 hr) in growth stimulators (100, 200 or 300 mg · L−1 GA3; 0.1% KNO3). Our findings demonstrate that there are no barriers in the diaspore for diffusion. Additionally, there is high variability in diaspore permeability, and the germination of the species has two steps divided into five stages. These stages were defined by inflections on velocity in water dynamics, which ranged from −0.05 to 0.05 g · hr−1, where only the last stage (Phase V) is associated with the second step of germination sensu stricto. The imbibition phase was the shortest germination phase (1.3 hr), whereas the predominantly biochemical phase was the longest (5 days after sowing [DAS]). Germinability was high (77.5–86.5%), with high daily embryo protrusion (2.46–3.03 diaspores · day−1). Protocorm emergence marked the end of the first step of germination sensu stricto (9 DAS), and first protocorm rupture (11 DAS) marked the end of the second step. The growth stimulus only concentrated the germination process, showing that the diaspores do not have primary dormancy. Knowing these diaspores’ peculiarities during germination sensu stricto avoids a false positive statement on the existence of diaspore dormancy.

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Section: Discussioncontrasting

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Misunderstanding on germination sensu stricto leads us to a false positive germination‐dormancy balance in diaspores of Paepalanthus chiquitensis Herzog (Eriocaulaceae), a threatened everlasting flowering species

Gonçalves-Magalhães

Santana

Ribeiro‐Oliveira

2021

Plant Species Biology

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Investigation of the Presence of Phenolic Compounds in Monocotyledonous Cell Walls, using UV Fluorescence Microscopy

Rudall

Caddick

1994

Annals of Botany

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Structure and Macromolecular Composition of the Seed Coat of the Musaceae

Graven¹,

Koster²,

Boon³

et al. 1996

Annals of Botany

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Mature seed coats of representatives of all three genera of Musaceae were analysed for macromolecular composition with various mass spectrometric techniques and compared with scanning electron microscopy and light microscopy in combination with histochemical techniques. Mass spectrometric techniques are more sensitive and more specific in identifying macromolecular compounds than histochemical methods. The macromolecular ' fingerprint ' of the seed coats of Musaceae showed unique components of aromatic phenols. The seed coat structure of all three genera is homogeneous within the Musaceae. It is characteristic at the family level and most complex within the Zingiberales. Very remarkable are the separation of the outer cell walls from the exotestal layer, exposing a secondary surface with silica crystals, and the relatively thick mesotesta which protects the seed, e.g. against the biting forces and passage through the digestive tracts of dispersing agents. Germination takes place with an operculum and is facilitated by a predetermined rupture layer in the micropylar collar. The musaceaous seed presents a good example of the solution of conflicting demands of protection and germination.

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The Families of the Monocotyledons. Structure, Evolution and Taxonomy

Cited by 110 publications

References 0 publications

Misunderstanding on germination sensu stricto leads us to a false positive germination‐dormancy balance in diaspores of Paepalanthus chiquitensis Herzog (Eriocaulaceae), a threatened everlasting flowering species

Misunderstanding on germination sensu stricto leads us to a false positive germination‐dormancy balance in diaspores of Paepalanthus chiquitensis Herzog (Eriocaulaceae), a threatened everlasting flowering species

Investigation of the Presence of Phenolic Compounds in Monocotyledonous Cell Walls, using UV Fluorescence Microscopy

Structure and Macromolecular Composition of the Seed Coat of the Musaceae

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