Molecular mechanisms of seed dormancy

Graeber, Kai; Nakabayashi, Kazumi; Miatton, Emma; Leubner‐Metzger, Gerhard; Soppe, Wim J. J.

doi:10.1111/j.1365-3040.2012.02542.x

Cited by 506 publications

(432 citation statements)

References 184 publications

(412 reference statements)

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“…However, processes leading to seed germination are controlled by specific genes; therefore, it can be supposed that laser light exerts an effect at a molecular level. Graeber et al (2012) found genes that control dormancy, including maturating genes, hormonal and epigenetic regulating genes, and genes that control release from dormancy.…”

Section: Discussionmentioning

confidence: 99%

Changes in the germination process and growth of pea in effect of laser seed irradiation

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Gładyszewska

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et al. 2015

International Agrophysics

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A b s t r a c t. The aim of this study was to determine the effect of pre-sowing helium-neon (He-Ne) laser irradiation of pea seeds on changes in seed biochemical processes, germination rate, seedling emergence, growth rate, and yield. The first experimental factor was exposure to laser radiation: D0 -no irradiation, D3 -three exposures, D5 -five exposures, and the harvest dates were the second factor. Pre-sowing treatment of pea seeds with He-Ne laser light increased the concentrations of amylolytic enzymes and the content of indole-3-acetic acid (IAA) in pea seeds and seedlings. The exposure of seeds to He-Ne laser light improved the germination rate and uniformity and modified growth stages, which caused acceleration of flowering and ripening of pea plants. Laser light stimulation improved the morphological characteristics of plants by increasing plant height and leaf surface area. Irradiation improved the yield of vegetative and reproductive organs of pea, although the effects varied at the different growth stages. The increase in the seed yield resulted from a higher number of pods and seeds per plant, whereas no significant changes were observed in the number of seeds per pod. Both radiation doses exerted similarly stimulating effects on pea growth, development, and yield.

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Section: Discussionmentioning

confidence: 99%

Changes in the germination process and growth of pea in effect of laser seed irradiation

Podleśna

Gładyszewska

Podleśny

et al. 2015

International Agrophysics

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“…3). First, it is well known that N-containing compounds including nitrate, nitrite and ammonium stimulate seed germination in many species, and therefore N pollutants might diminish the seed bank by promoting seed germination 10,12,[17][18][19] . N deposition also acidifies soils 20 , which has complex effects on seed germination, but may promote germination in some species, either directly 21 or indirectly (for example, by the effects of increasing toxic metal levels 22,23 and microbial growth and composition 24 ).…”

Section: Discussionmentioning

confidence: 99%

Long-term nitrogen deposition depletes grassland seed banks

et al. 2015

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Nitrogen (N) pollution is a global threat to the biodiversity of many plant communities, but its impacts on grassland soil seed banks are unknown. Here we show that size and richness of an acid grassland seed bank is strongly reduced after 13 years of simulated N deposition. Soils receiving 140 kg N ha À 1 per year show a decline in total seed abundance, seed species richness, and the abundance of forbs, sedges and grasses. These results reveal larger effects of N pollution on seed banks than on aboveground vegetation as cover and flowering is not significantly altered for most species. Further, the seed bank shows no recovery 4 years after the cessation of N deposition. These results provide insights into the severe negative effects of N pollution on plant communities that threaten the stability of populations, community persistence and the potential for ecosystems to recover following anthropogenic disturbance or climate change.

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“…The majority of genetic factors, including morphologic, physiologic, and biochemical are extensively reviewed elsewhere (DePauw and McCaig 1991;Fang and Chu 2008;Kulwal et al 2010;Graeber et al 2012;DePauw et al 2012;Gao et al 2013). One facet of this complex trait deals with the balance of plant growth regulators abscisic acid (ABA) and gibberellic acid (GA) in their control of alpha-amylase enzyme activity.…”

Section: Introductionmentioning

confidence: 99%

Maximizing the identification of QTL for pre-harvest sprouting resistance using seed dormancy measures in a white-grained hexaploid wheat population

et al. 2015

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Pre-harvest sprouting in spring wheat causes significant financial loss to growers throughout the world and sprouting damage can be reduced by growing resistant genotypes. Several genetic factors, especially those related to seed dormancy, are involved in the control of pre-harvest sprouting resistance. The objective of this study was to identify quantitative trait loci (QTL) influencing pre-harvest sprouting resistance from multiple measures of dormancy at multiple germination intervals on seed harvested across multiple environments. A doubled haploid mapping population of 91 individuals derived from a cross of two Canadian white-seeded spring wheat genotypes, SC8021-V2 (pre-harvest sprouting resistant) and AC Karma (moderately susceptible to pre-harvest sprouting) was used for QTL mapping. Daily germination counts were analysed using germination index, germination resistance and percent germination at intervals of 3, 5, 7, 10, 14 and 21 days from spike samples collected from six field and one greenhouse environments in Saskatchewan, Canada. Continuous frequency distributions at certain measure-durations indicated genetic complexity of dormancy segregation in the SC8021-V2/AC Karma cross. Composite interval mapping detected significant (p B 0.05) QTL associated with resistance to pre-harvest sprouting on all 21 wheat chromosomes. Of the 26 total QTL, six were novel and the rest were detected either at the same marker or overlapping a marker interval reported in other studies. QTL expressed consistently for germination index, germination resistance and percent germination at different germination durations on chromosomes 2B, 4A, 5D and 6D. QTL identified on homoeologous chromosomes 4A, 4B and 4D with chromosome specific molecular variants of SSR marker wmc617 suggest a conserved region for controlling dormancy on group four. The majority of QTL mapped in regions known to contain factors affecting different components of pre-harvest sprouting resistance like seed dormancy, seed coat colour, ABA responsiveness and alpha-amylase activity. This study demonstrated that using multiple measures of seed dormancy Electronic supplementary material The online version of this article (doi:10.1007/s10681-015-1460-x) contains supplementary material, which is available to authorized users. Euphytica (2015) 205:287-309 DOI 10.1007/s10681-015-1460 at multiple intervals of germination enhanced identification of QTL affecting dormancy in white-seeded hexaploid wheat.

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Molecular mechanisms of seed dormancy

Cited by 506 publications

References 184 publications

Changes in the germination process and growth of pea in effect of laser seed irradiation

Changes in the germination process and growth of pea in effect of laser seed irradiation

Long-term nitrogen deposition depletes grassland seed banks

Maximizing the identification of QTL for pre-harvest sprouting resistance using seed dormancy measures in a white-grained hexaploid wheat population

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