Sensitivity to ethylene as a major component in the germination of seeds of Stylosanthes humilis

Ribeiro, Dimas M.; Barros, Raimundo Santos

doi:10.1079/ssr2005233

Cited by 26 publications

(17 citation statements)

References 23 publications

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“…Cell expansion growth required for radicle protrusion and seed coat rupture depends on environmentally and hormonally regulated cell wall-loosening mechanisms (Van Sandt et al, 2007;Linkies et al, 2009;Muller et al, 2009;Morris et al, 2011). In Townsville stylo embryo hypocotylradicle axis growth are associated with ethylene production as a mechanism for cell expansion growth (Vieira and Barros, 1994;Ribeiro and Barros, 2006). Freshly harvested seed and non-dormant seeds germinated only about 20% when treated with ACC (immediate precursor of ethylene), CEPA (an ethylene-releasing compound) or ethylene gas (Figure 1a).…”

Section: Resultsmentioning

confidence: 99%

Effect of the seed coat on dormancy and germination in Stylosanthes humilis H. B. K. Seeds

2017

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Seed of Townsville stylo (Stylosanthes humilis H.B.K.) is known to exhibit a hard seed coat and when freshly harvested also show a physiological dormancy, however, the nature of the co-actions between seed coat and embryo growth that determine dormancy is poorly understood. In this study, physical dormancy of Townsville stylo seeds was not reduced during natural ageing at room temperature, in contrast to the physiological dormancy, which is gradually overcome during after-ripening. Furthermore, the permeability of seed coat was affected by scarification treatments as well as by low-pH solutions. Together, these data indicate that physical dormancy overcome of seed is prerequisite for radicle protrusion and physiological dormancy of Townsville stylo seeds contribute to its timing.

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Section: Resultsmentioning

confidence: 99%

Effect of the seed coat on dormancy and germination in Stylosanthes humilis H. B. K. Seeds

2017

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“…Breaking of dormancy during chilling of apple seeds, or during dry storage of sunflower achenes, results in an increasing sensitivity to ethylene (Sinska, 1989; Corbineau and Côme, 2003). In Stylosanthes humilis , non-dormant seeds are at least 50-fold more sensitive to ethylene than freshly harvested dormant ones (Ribeiro and Barros, 2006). Improvement of dormant seed germination does not require a continuous application of ethylene; a short treatment in the presence of this compound is sufficient to improve germination of dormant seeds in various species (Schönbeck and Egley, 1981; Corbineau and Côme, 2003; Kepczynski et al, 2003).…”

Section: Ethylene Biosynthesis Signaling and Aba Crosstalk In Seed mentioning

confidence: 99%

ABA crosstalk with ethylene and nitric oxide in seed dormancy and germination

Arc¹,

Sechet²,

Corbineau³

et al. 2013

Front. Plant Sci.

227

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Dormancy is an adaptive trait that enables seed germination to coincide with favorable environmental conditions. It has been clearly demonstrated that dormancy is induced by abscisic acid (ABA) during seed development on the mother plant. After seed dispersal, germination is preceded by a decline in ABA in imbibed seeds, which results from ABA catabolism through 8′-hydroxylation. The hormonal balance between ABA and gibberellins (GAs) has been shown to act as an integrator of environmental cues to maintain dormancy or activate germination. The interplay of ABA with other endogenous signals is however less documented. In numerous species, ethylene counteracts ABA signaling pathways and induces germination. In Brassicaceae seeds, ethylene prevents the inhibitory effects of ABA on endosperm cap weakening, thereby facilitating endosperm rupture and radicle emergence. Moreover, enhanced seed dormancy in Arabidopsis ethylene-insensitive mutants results from greater ABA sensitivity. Conversely, ABA limits ethylene action by down-regulating its biosynthesis. Nitric oxide (NO) has been proposed as a common actor in the ABA and ethylene crosstalk in seed. Indeed, convergent evidence indicates that NO is produced rapidly after seed imbibition and promotes germination by inducing the expression of the ABA 8′-hydroxylase gene, CYP707A2, and stimulating ethylene production. The role of NO and other nitrogen-containing compounds, such as nitrate, in seed dormancy breakage and germination stimulation has been reported in several species. This review will describe our current knowledge of ABA crosstalk with ethylene and NO, both volatile compounds that have been shown to counteract ABA action in seeds and to improve dormancy release and germination.

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“…Treatment with ethephon and 1-aminocyclopropane-1-carboxylic acid (ACC), two ethylene suppliers, breaks seed dormancy in Amaranthus retroflexus (Kepczynski et al, 1996). A high concentration of ethylene is required to break the physiological dormancy of fresh Townsville stylo (Stylosanthes humilis) seeds (Ribeiro and Barros, 2006); however, low levels of ethylene are able to stimulate Rhus coriaria seed germination (Ne'Eman et al, 1999). ACC treatment also improves germination speed in Arabidopsis (Arabidopsis thaliana) and tomato (Solanum lycopersicum) seeds (Siriwitayawan et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

ETR1/RDO3 Regulates Seed Dormancy by Relieving the Inhibitory Effect of the ERF12-TPL Complex on DELAY OF GERMINATION1 Expression

Chen

et al. 2019

Plant Cell

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The control of seed dormancy by ethylene has been well studied, but the underlying molecular mechanisms are not fully understood. Here, we report the characterization of the Arabidopsis (Arabidopsis thaliana) mutant reduced dormancy 3 (rdo3) and the cloning of the underlying gene. We demonstrate that rdo3 is a loss-of-function mutant of the ethylene receptor ETHYLENE RESPONSE1 (ETR1). ETR1 controls seed dormancy partially through the DELAY OF GERMINATION1 (DOG1) pathway. Molecular and genetic analyses demonstrated that ETHYLENE RESPONSE FACTOR12 (ERF12) is involved in the regulation of seed dormancy downstream of ETR1. ERF12 interacts with TOPLESS (TPL) and genetically requires TPL to function. ERF12 and TPL repress the expression of DOG1 by occupying its promoter. Thus, we identified the dormancy pathway ETR1-ERF12-TPL-DOG1 and provide mechanistic insights into the regulation of seed dormancy by linking the ethylene and DOG1 pathways.

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Sensitivity to ethylene as a major component in the germination of seeds of Stylosanthes humilis

Cited by 26 publications

References 23 publications

Effect of the seed coat on dormancy and germination in Stylosanthes humilis H. B. K. Seeds

Effect of the seed coat on dormancy and germination in Stylosanthes humilis H. B. K. Seeds

ABA crosstalk with ethylene and nitric oxide in seed dormancy and germination

ETR1/RDO3 Regulates Seed Dormancy by Relieving the Inhibitory Effect of the ERF12-TPL Complex on DELAY OF GERMINATION1 Expression

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