Factors contributing to the regulation of thermoinhibition in Tagetes minuta L.

Taylor, N. J.; Hills, P.N.; Gold, John D.; Stirk, Wendy A.; Staden, J. Van

doi:10.1016/j.jplph.2005.01.016

Cited by 10 publications

(13 citation statements)

References 22 publications

(26 reference statements)

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“…change in the polypeptide profiles was observed after 12 h imbibition (Hills et al 2001). High concentrations of ABA in dry achenes decreased sharply upon imbibition with the onset of germination (Taylor et al 2005). Thus, in the present study, the sample collected after 24 h imbibition was considered to be in the process of germination while the samples collected at 48 h and after, represented early stages of seedling development.…”

Section: Resultsmentioning

confidence: 81%

“…The presence and role of endogenous BA has been overlooked as it was originally thought to be a synthetic cytokinin. Application of various forms of exogenous cytokinins, including BA, decreased the final germination percentage of T. minuta (Taylor et al 2005), indicating that inhibitory concentrations were achieved with exogenous application. One can therefore hypothesize that lower levels of endogenous cytokinins are needed for germination and radicle extension.…”

Section: Discussionmentioning

confidence: 99%

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Changes in Endogenous Cytokinins During Germination and Seedling Establishment of Tagetes minuta L.

et al. 2005

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Endogenous cytokinins were quantified and identified in germinating achenes and developing seedlings of Tagetes minuta L. incubated at 25°C over a 144 h period. The process of germination (radicle emergence) was completed 38 h after commencement of imbibition. Subsequent growth was considered to cover seedling establishment. Eighteen isoprenoid cytokinins, belonging to the zeatin (9), dihyrozeatin (5) and isopentenyladenine (4) groups and one aromatic cytokinin, benzyladenine, were identified. The total isoprenoid cytokinin concentration increased upon imbibition, reached a peak by 48 h and subsequently decreased with seedling development. The individual cytokinin groups and the respective derivatives within each group did, however, not follow such a consistent trend. During the course of the experiment, the ribotides and ribosides were present in the highest concentrations, reaching a peak at 48 h and decreasing thereafter. The free bases and O-glucoside remained at low levels throughout the experiment. Isopentenyladenine-9-glucoside increased dramatically in the developing seedlings and after 144 h was the predominate cytokinin. Benzyladenine was the only aromatic cytokinin detected throughout the experiment. It was present in high concentrations in the dry achenes and declined rapidly upon imbibition.Abbreviations: ABA

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Section: Resultsmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Changes in Endogenous Cytokinins During Germination and Seedling Establishment of Tagetes minuta L.

et al. 2005

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“…For carrot ( Daucus carota) seeds, there was a positive correlation among genotypes between their ethylene production and their capacity for germination at high temperatures (Nascimento et al 2008). Thermoinhibition in marigold ( Tagetes minuta) seeds was alleviated by a combination of treatments that reduced ABA levels and increased ethylene levels, although ethylene alone was less effective (Taylor et al 2005).…”

Section: Ethylene Promotes Seed Germination At High Temperaturementioning

confidence: 99%

Molecular and Hormonal Regulation of Thermoinhibition of Seed Germination

Huo

Bradford

2015

Advances in Plant Dormancy

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“…As ABA is associated with the imposition of thermoinhibition (Yoshioka et al, 1998;Gonai et al, 2004;Taylor et al, 2005) it was reasoned that it may be acting by preventing cell elongation at supra-optimal temperatures. Fusicoccin was able to partly overcome ABA inhibition of germination and subsequent seedling growth at 25 1C in T. minuta, as seen in cotton (Halloin, 1976), barley (Wang et al, 1998) and lettuce seeds (Tajima et al, 2004).…”

Section: Article In Pressmentioning

confidence: 99%

“…Tagetes minuta falls almost exclusively into the second category of control, as partial or complete removal of the embryo coverings had no effect on germination at 36 1C, but a combination of fluridone, gibberellins (GA 4+7 ) and ethephon did result in germination at supra-optimal temperatures (Taylor et al, 2005). In addition, a specific set of ten, water-soluble polypeptides are differentially expressed in thermoinhibited achenes and are tightly linked with the onset and release of thermoinhibition (Hills et al, 2001).…”

Section: Introductionmentioning

confidence: 99%