Influence of soil moisture on the competitive ability and seed dormancy of <i>Sinapis arvensis</i> in spring wheat

Wright, Kathryn; Seavers, G P; Peters, N. C. B.; Marshall, M A

doi:10.1046/j.1365-3180.1999.00147.x

Cited by 28 publications

(25 citation statements)

References 7 publications

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“…We note that the models left a percentage of unexplained variation, showing that temperature is only one of the factors determining phenotypic plasticity in dormancy. Water availability was related to subsequent dormancy levels in controlled garden experiments (Wright et al, 1999;Allen and Meyer, 2002;Luzuriaga et al, 2006;Hoyle et al, 2008), while long-term differences in rainfall influenced dormancy in our study species . Similarly, daylength during seed maturation has been found to have an effect on dormancy (Fenner, 1991;Fenner and Thompson, 2005).…”

Section: Discussionmentioning

confidence: 70%

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: Discussionmentioning

confidence: 70%

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

Fernández-Pascual

Jíménez-Alfaro²

2014

Seed Sci. Res.

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“…After the removal of the perianth wings, the yellow seeds were significantly heavier and exhibited both a faster germination rate and a higher germination percentage than the pink seeds. Variation in seed size is often associated with different maternal effects such as nutrient availability, soil moisture content, and temperature (, ) but may not explain our results since both morphs co‐exist in the same population. However, the larger size of the yellow seeds provides a logical explanation for their higher probability of germination.…”

Section: Discussionmentioning

confidence: 93%

Perianth colour dimorphism is related to germination properties and salinity tolerance in Salsola vermiculata in the Arabian deserts

Bhatt

Phartyal

Phondani

et al. 2017

Nordic Journal of Botany

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We investigated the dimorphic perianth colour of Salsola vermiculata and its association with seed germination percentage, interactions with temperature, light, salinity and recovery from prior salinity exposure. Seeds with and without pink and yellow perianth were incubated at three thermal regimes, two photoperiods, and five salinity levels. Germination recovery after salinity exposure was observed on seeds that failed to germinate during the salinity study. The germination percentage and rate were signiﬁcantly related to the perianth colour, the presence of perianth wings, thermal regimes and photoperiod. The presence of a perianth wing significantly reduced germination percentage and germination rate in both the pink and the yellow morph, but the yellow morph exhibited a higher germination percentage. Perianth wing removal increased germination in saline conditions. With the perianth removed, germination recovery was higher for the pink morph than for the yellow one. We suggest that by providing two different strategies for balancing germination with dormancy during favourable conditions, the presence of two morphs makes S. vermiculata more successful in highly unpredictable desert environments.

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“…46,47 Drought may increase germination through maternal effects on seed dormancy, 35 which, in some species, is reduced in seeds produced by plants growing in dry soils. 35,48 In addition, seeds under drought stress show abrupt changes in seed abscisic acid (ABA) content during their development, and low sensitivity to exogenous ABA, which increases their germination. 49 Third, rehydration of seeds in the soil is required to activate repair processes, 50 and consequently to increase their persistence.…”

Section: Discussionmentioning

confidence: 99%

Severe effects of long-term drought on calcareous grassland seed banks

et al. 2018

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Climate change models project shifts in precipitation patterns at regional and global scales. Increases in dry areas and the occurrence of drought predicted in future scenarios are likely to threaten grassland ecosystems. Calcareous grassland seed banks have proven to be resistant to short-term drought, but their responses to long-term drought are unknown. Here we show that 14 years of summer drought changed calcareous grassland seed bank composition, reducing its size and richness, and that these responses do not simply reflect patterns in the above-ground vegetation. Moreover, the effect of drought was larger on seed banks than on vegetation, and above-ground responses mediated by soil depth were less evident in the seed bank than in the vegetation. These results demonstrate that the severity of drought effects on calcareous grasslands is larger than previously thought, and show that this ecosystem is highly vulnerable and has low resilience to predicted decreases in soil moisture.

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Influence of soil moisture on the competitive ability and seed dormancy of Sinapis arvensis in spring wheat

Cited by 28 publications

References 7 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

Perianth colour dimorphism is related to germination properties and salinity tolerance in Salsola vermiculata in the Arabian deserts

Severe effects of long-term drought on calcareous grassland seed banks

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