Dormancy-associated gene expression in pea axillary buds.

Stafstrom, Joel P.; Ripley, Bret D.; Devitt, Michelle L.; Drake, Beth M.

doi:10.1007/s004250050354

Cited by 110 publications

(91 citation statements)

References 28 publications

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“…amino acid sequence of the DRM1 gene in other species (Stafstrom et al, 1998;Kebrom et al, 2006). The DRM1-like gene was upregulated at 18 DAP in the third leaf axil in tin compared with wild-type buds, consistent with the conserved function of this gene and the dormancy status of the tin buds (Fig.…”

Section: Expression Of Tb1-and Drm1-like Genes In Axillary Buds Of Tisupporting

confidence: 65%

“…SbMAX2 is a putative ortholog of Arabidopsis MAX2 and encodes an F-box protein, which probably functions in the perception or signal transduction of strigolactones (Stirnberg et al, 2002;Stirnberg et al, 2007). SbDRM1 is a putative ortholog of the DRM1 gene of pea that encodes a protein of unknown function (Stafstrom et al, 1998). Because the roles of MAX2 and DRM1 appear to be more closely aligned to dormancy than TB1, signal integration may occur downstream of TB1.…”

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confidence: 99%

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Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

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Tillering (branching) is a major yield component and, therefore, a target for improving the yield of crops. However, tillering is regulated by complex interactions of endogenous and environmental signals, and the knowledge required to achieve optimal tiller number through genetic and agronomic means is still lacking. Regulatory mechanisms may be revealed through physiological and molecular characterization of naturally occurring and induced tillering mutants in the major crops. Here we characterize a reduced tillering (tin, for tiller inhibition) mutant of wheat (Triticum aestivum). The reduced tillering in tin is due to early cessation of tiller bud outgrowth during the transition of the shoot apex from the vegetative to the reproductive stage. There was no observed difference in the development of the main stem shoot apex between tin and the wild type. However, tin initiated internode development earlier and, unlike the wild type, the basal internodes in tin were solid rather than hollow. We hypothesize that tin represents a novel type of reduced tillering mutant associated with precocious internode elongation that diverts sucrose (Suc) away from developing tillers. Consistent with this hypothesis, we have observed upregulation of a gene induced by Suc starvation, downregulation of a Suc-inducible gene, and a reduced Suc content in dormant tin buds. The increased expression of the wheat Dormancy-associated (DRM1-like) and Teosinte Branched1 (TB1-like) genes and the reduced expression of cell cycle genes also indicate bud dormancy in tin. These results highlight the significance of Suc in shoot branching and the possibility of optimizing tillering by manipulating the timing of internode elongation.

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Section: Expression Of Tb1-and Drm1-like Genes In Axillary Buds Of Tisupporting

confidence: 65%

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confidence: 99%

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

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“…In addition, the relative expression level in the mature tomato ovary of two genes homologous to PsDRM1, which proved to be excellent dormancy (DRM) markers in pea (Stafstrom et al 1998), are high. Together, this suggests that the mature ovary before pollination has entered a temporarily dormant state, during which the tissue is quiescent.…”

Section: Function Of Aba During Fruit Setmentioning

confidence: 99%

Abscisic acid levels in tomato ovaries are regulated by LeNCED1 and SlCYP707A1

Nitsch

Oplaat

Feron

et al. 2009

Planta

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Although the hormones, gibberellin and auxin, are known to play a role in the initiation of fruits, no such function has yet been demonstrated for abscisic acid (ABA). However, ABA signaling and ABA responses are high in tomato (Solanum lycopersicum L.) ovaries before pollination and decrease thereafter (Vriezen et al. in New Phytol 177:60-76, 2008). As a Wrst step to understanding the role of ABA in ovary development and fruit set in tomato, we analyzed ABA content and the expression of genes involved in its metabolism in relation to pollination. We show that ABA levels are relatively high in mature ovaries and decrease directly after pollination, while an increase in the ABA metabolite dihydrophaseic acid was measured. An important regulator of ABA biosynthesis in tomato is 9-cis-epoxy-carotenoid dioxygenase (LeNCED1), whose mRNA level in ovaries is reduced after pollination. The increased catabolism is likely caused by strong induction of one of four newly identiWed putative (+)ABA 8Ј-hydroxylase genes. This gene was named SlCYP707A1 and is expressed speciWcally in ovules and placenta. Transgenic plants, overexpressing SlCYP707A1, have reduced ABA levels and exhibit ABA-deWcient phenotypes suggesting that this gene encodes a functional ABA 8Ј-hydroxylase. Gibberellin and auxin application have diVerent eVects on the LeNCED1 and SlCYP707A1 gene expression. The crosstalk between auxins, gibberellins and ABA during fruit set is discussed.

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“…Gene expression and protein profiling studies in pea have revealed that removal of the shoot tip induces axillary buds to enter a transition state between dormancy and growth ( Fig. 2A) and that whether buds subsequently revert back to the dormant state or proceed to sustained growth is influenced by the state of other buds (Stafstrom et al, 1998;Shimazo-Sato and Mori, 2001).…”

Section: Vegetative Meristem Development Networkmentioning

confidence: 99%