Intermediate complex morphophysiological dormancy in the endemic Iberian Aconitum napellus subsp. castellanum (Ranunculaceae)

Herranz, José Marı́a; Copete, Miguel Á.; Ferrandis, Pablo; Copete, Elena

doi:10.1017/s0960258510000048

Cited by 30 publications

(21 citation statements)

References 33 publications

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“…Our study suggests that wild populations of C. somedanum show phenotypic plasticity in seed dormancy during successive years. While similar plasticity has been found in other species (Andersson and Milberg, 1998; Schütz and Rave, 2003; Herranz et al , 2010), to our knowledge this is the first time that inter-annual germination plasticity has been related to inter-annual differences in temperature. Influences of local temperatures on dormancy have usually been tested in space , i.e.…”

Section: Discussionsupporting

confidence: 87%

Phenotypic plasticity in seed germination relates differentially to overwintering and flowering temperatures

Fernández-Pascual

Jíménez-Alfaro²

2014

Seed Sci. Res.

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Phenotypic plasticity in seed dormancy may allow plant species to cope with rapid environmental changes, such as climate warming. In controlled experimental settings, plasticity in dormancy has been found to relate to temperature during seed maturation, but this relationship has not been tested in field conditions. Here we analyse for the first time the variation in dormancy during five successive years in wild populations of the study species Centaurium somedanum, to determine how this variation is related to average temperatures during specific seasons of plant activity. We performed laboratory germination experiments to measure: (1) the degree of dormancy at dispersal; and (2) the sensitivity to dormancybreaking factors. We calculated average temperatures during four seasons of plant activity (overwintering, vegetative growth, flowering and seed maturation) for each year, and tested the relationship between these temperatures and patterns of dormancy variation, using Generalized Linear Models. Dormancy varied among sites and years, seeds being more dormant in colder years. For the degree of dormancy at dispersal, we found a positive relationship with flowering temperature and a significant effect of collection site. For the sensitivity to dormancy-breaking factors, we found no significant differences among sites, a positive relationship with flowering temperature and a negative relationship with overwintering temperature. Phenotypic plasticity in dormancy in C. somedanum is thus especially marked in the sensitivity to dormancybreaking factors. Temperatures during overwintering and flowering have differential effects on this plasticity, allowing the plant to detect the gradient of seasonality, a main ecological feature of its distribution.These results highlight the importance of taking into account more than average temperatures when assessing the response of plant phenotypic plasticity to climate change.

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Section: Discussionsupporting

confidence: 87%

Phenotypic plasticity in seed germination relates differentially to overwintering and flowering temperatures

Fernández-Pascual

Jíménez-Alfaro²

2014

Seed Sci. Res.

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“…This hypothesis has been suggested previously for other species whose MPD requires cold stratification, such as Thaspium pinnatifidum (Baskin et al , 1992), Delphinium tricorne (Baskin and Baskin, 1994), Anthriscus sylvestris (Baskin et al , 2000), and Aconitum napellus subsp. castellanum (Herranz et al , 2010a). In the unheated shadehouse, the embryos grew from 1.67 to 2.18 mm during September and October 2003 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Although the increase of germination with seed storage duration is frequent in seeds with non-deep physiological dormancy (Baskin and Baskin, 1998; Copete et al , 2005), it is less known in seeds with MPD, having also been cited in two species with intermediate complex MPD: A. napellus subsp. castellanum (Herranz et al , 2010a) and Delphinium fissum subsp. sordidum (Herranz et al , 2010b).…”

Section: Discussionmentioning

confidence: 99%

Non-deep complex morphophysiological dormancy inNarcissus longispathus(Amaryllidaceae): implications for evolution of dormancy levels within sectionPseudonarcissi

2013

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Narcissus longispathus(Amaryllidaceae) is a perennial geophyte and a Mediterranean narrowly endemic species. At dispersal time,N. longispathusseeds are dormant and have underdeveloped embryos. This work aimed to determine requirements for dormancy break and germination and to compare dormancy traits with those of the two endemic Iberian congeners. Phenology of embryo growth and germination were studied by regularly exhuming seeds sown in near-natural conditions. Temperature and light requirements for embryo growth, breaking of dormancy and germination were determined by incubating seeds under controlled laboratory conditions. Mean embryo length in fresh seeds was 1.50 mm, and embryos had to grow to 3.80 mm before radicle emergence. Embryos grew to full size and seeds germinated when they were warm stratified for 2 months (optimum 1 month at 20/7°C+1 month at 15/4°C), then cold stratified at 5°C for 2 months, and finally incubated at cool temperatures (15/4°C) for 30 d. However, in seeds only subjected to either warm or cold stratification, the embryos hardly grew and did not germinate. In natural conditions, the embryos elongate in autumn–winter, and in late winter–early spring (March) almost all radicles and seedlings emerged. Velocity of embryo growth and germination percentages increased with seed storage duration. Seeds ofN. longispathushave non-deep complex morphophysiological dormancy (MPD). This is the first report of such a level of MPD inNarcissus. Our data suggest that non-deep complex MPD may have been derived from intermediate complex MPD in the sectionPseudonarcissi.

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“…The seeds of different individuals within a population of the same species show variations in seed germination biology, including dormancy and receptiveness of dormancy-breaking factors 27 . Moreover, seeds collected from different sites, years, altitude gradients and habitats also exhibit differences in seed germination biology due to inherent environmental conditions 23 , 28 – 30 .…”

Section: Introductionmentioning

confidence: 99%

Germination Biology of Two Invasive Physalis Species and Implications for Their Management in Arid and Semi-arid Regions

Özaslan

Farooq

Önen

et al. 2017

Sci Rep

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Two Solanaceae invasive plant species (Physalis angulata L. and P. philadelphica Lam. var. immaculata Waterfall) infest several arable crops and natural habitats in Southeastern Anatolia region, Turkey. However, almost no information is available regarding germination biology of both species. We performed several experiments to infer the effects of environmental factors on seed germination and seedling emergence of different populations of both species collected from various locations with different elevations and habitat characteristics. Seed dormancy level of all populations was decreased with increasing age of the seeds. Seed dormancy of freshly harvested and aged seeds of all populations was effectively released by running tap water. Germination was slightly affected by photoperiods, which suggests that seeds are slightly photoblastic. All seeds germinated under wide range of temperature (15–40 °C), pH (4–10), osmotic potential (0 to −1.2 MPa) and salinity (0–400 mM sodium chloride) levels. The germination ability of both plant species under wide range of environmental conditions suggests further invasion potential towards non-infested areas in the country. Increasing seed burial depth significantly reduced the seedling emergence, and seeds buried below 4 cm of soil surface were unable to emerge. In arable lands, soil inversion to maximum depth of emergence (i.e., 6 cm) followed by conservational tillage could be utilized as a viable management option.

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Intermediate complex morphophysiological dormancy in the endemic Iberian Aconitum napellus subsp. castellanum (Ranunculaceae)

Cited by 30 publications

References 33 publications

Phenotypic plasticity in seed germination relates differentially to overwintering and flowering temperatures

Phenotypic plasticity in seed germination relates differentially to overwintering and flowering temperatures

Non-deep complex morphophysiological dormancy inNarcissus longispathus(Amaryllidaceae): implications for evolution of dormancy levels within sectionPseudonarcissi

Germination Biology of Two Invasive Physalis Species and Implications for Their Management in Arid and Semi-arid Regions

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