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Showing 1 to 20 of 34 for “"seed dormancy"”.
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Seed dormancy and germination of northern red oak
… Freshly harvested northern red oak seed exhibit dormancy that may be broken by stratification or pericarp removal. In this research, germination, seedling growth and adenylate energy metabolism of northern red oak with pericarp removed and intact was measured during stratification …
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Growth hormones and their relationship to seed dormancy in Quercus
Northern red oak (Q. rubra L.) seeds were dormant and required 10 weeks of moist, cold stratification before a large percentage of the seeds would germinate. White oak (Q. alba L.) seeds were not dormant and germinated immediately upon falling from the mother tree. A transfer of mass from the …
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Ecology of wild radish (Raphanus raphanistrum) : crop-weed competition and seed dormancy.
… higher densities of wheat were able to suppress seed production of this weed species.
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Silencing Seed Dormancy Genes to Mitigate Risk of Transgene Flow to Weedy Rice
… serious ecological and economic consequences. Seed dormancy (SD) is a key adaptive trait that distributes germination over time, resulting in weed persistence in agroecosystems. Thus, silencing major genes controlling SD would reduce the adaptive fitness of weeds. SD-enhancing genes cloned from …
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Epigenetic control of seed dormancy using Capsella bursa-pastoris as a model species
The function of seed dormancy is to spread germination across time in synchrony with seasonal cycles to avoid unfavourable environmental conditions. Phase transitions during seeds’ life require genome reprogramming at a large scale, which is often associated with major changes in chromatin …
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A Hydrothermal After-ripening Time Model of Seed Dormancy Loss in Bromus tectorum
<p>After-ripening, the process of seed dormancy loss in dry storage is associated with a decrease in the mean base water potential, one of the parameters of hydrothermal time. The rate of change of the mean base water potential is assumed to be a linear function of temperature above a specific base …
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Seed dormancy and germination niches of Mediterranean species along an altitudinal gradient in Sardinia
… crucial environmental factor for the failure of seedling emergence / establishment is temperature stress; consequently, seed germination should be triggered by favourable temperature conditions for the further development of the seedling. Therefore, temperature is the primary environmental factor …
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Relationship between seed dormancy and persistence of seeds of annual ruderal species in the soil seedbank
Knowledge related to seed persistence in soil is critical for weed control decisions in the integrated weed management systems. Many annual weed species have dormant soil seed banks (SSBs), and this may be an important mechanism for seed persistence in these species. Although the relationship …
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Proteomics Study of Pre-Harvest Sprouting in Wheat
… was found to be important in maintaining seed dormancy in resistant germplasm; whereas over-expression of energy metabolism related proteins was observed in PHS-susceptible germplasm for the production of energy required for seedling growth. ABA appeared to be involved in seed dormancy, …
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Seed and vegetative propagation methods for the rare Florida native species Chionanthus pygmaeus (pygmy fringetree)
… to propagate via cuttings and possess complex seed dormancies that are not well understood. Conservation of pygmy fringetree and its potential for commercial propagation for use in managed landscapes is contingent on a better understanding of its complex seed dormancy and enhancement of its …
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The Effects of Gibberellic Acid, Smoke Water, and Cold Stratification on the Germination of Asclepias and Liatris Seeds
<p>Seed dormancy presents a significant challenge in the propagation of many native perennial species, including members of the <em>Asclepias</em> and <em>Liatris</em> genera. This study evaluated the effects of cold stratification and chemical treatments on the germination performance of six …
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Qualidade fisiológica de sementes de acacia farnesiana (l.) willd. após tratamentos pré-germinativos
… study was to evaluate methods for overcoming seed dormancy of A. farnesiana, as well as the effect of different temperatures in conducting germination test. To overcome seed dormancy treatments used were: immersion in water at a temperature of 60, 70, 80, 90 and 100 °C for one minute (T1, T2, …
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Composted dairy manure and arbuscular mycorrhizae influence on weed competition and potato yield
… microbial communities, weed competition, weed seed fecundity, mortality, and dormancy. Potatoes were grown in field plots amended with 0, 4, or 8 t carbon (C) ha<super>-1</super> of compost during the summer under weed-free conditions, and in competition with common lambsquarters (CHEAL), giant …
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Germination niche of Sardinian endemic species in mountain riparian deciduous forests
… one of the major environmental factor governing seed germination in moist soil and, also is responsible for changes in dormancy states of seeds. Seed dormancy prevents germination in a specified period of time, under any combination of environmental factors that otherwise favour germination and …
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Evolutionary potential of a dispersal-restricted species in response to climate change
… experienced by the vernal pools has selected for seed dormancy in <em>L. fremontii</em> populations, and (3) the degree of local adaptation and additive genetic variation in response to a simulated spectrum of precipitation conditions. My analyses revealed an isolation-by-distance model of genetic …
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High Residue Cover Crops for Annual Weed Suppression in Corn and Soybean Production and Potential for Hairy Vetch (Vicia villosa) to be Weedy
… and Purple Bounty, and to determine when viable seed are produced. Almost all germination occurred in the initial cover crop growing season for both cultivars. Both cultivars had <1% of viable seed at the termination of the experiment. These results indicate that seed dormancy is not the primary …
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Meccanismi fisiologico-molecolari di germinazione in specie spontanee
Seed dormancy provides a mechanism for plants to delay germination until conditions are optimal for survival of the next generation. Knowledge of dormancy release and dormancy induction requirements is important to increase our understanding about the entire process. Furthermore, to assess the …
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Integrated in situ and ex situ approach for Gentiana lutea L. ssp. lutea conservation
… in natural sites, the understanding of the seed behaviour in the soil and the investigation of the germination response under laboratory conditions. In particular, the isolated and on the boundary Sardinian population can differ genetically and morphologically from central populations …
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The Role of Temperature in the Seed Germination Ecology of Mountain Springs and Fens
… groundwater. This thesis studies their seed ecology, focusing on the interaction between environmental temperature and germination. To this end we conduct laboratory germination experiments with calcareous spring fen species to characterize the temperature dimension of the germination …
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