The trehalose pathway in maize: conservation and gene regulation in response to the diurnal cycle and extended darkness

Henry, Clémence; Bledsoe, Samuel W.; Siekman, Allison C.; Kollman, Alec; Waters, Brian M.; Feil, Regina; Stitt, Mark; Lagrimini, L. Mark

doi:10.1093/jxb/eru335

Cited by 56 publications

(93 citation statements)

References 68 publications

(136 reference statements)

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“…These striking correlations between Tre6P and Suc led to the proposal that Tre6P is a signal of the plant's C status and possibly a specific signal for the availability of Suc (Lunn et al, 2006). Strong, positive correlations between Suc and Tre6P levels have since been observed in various other Arabidopsis tissues and developmental stages (Wingler et al, 2012;Carillo et al, 2013;Martins et al, 2013;Nunes et al, 2013a;Ragel et al, 2013;Wahl et al, 2013;Sulpice et al, 2014;Yadav et al, 2014), and in other species, including potato (Solanum tuberosum; Debast et al, 2011), wheat (Triticum aestivum; Martínez-Barajas et al, 2011), maize (Zea mays; Henry et al, 2014), and cucumber (Cucumis sativa; Zhang et al, 2015). Sugaraddition experiments with C-starved seedlings showed that only Suc, or sugars that can be readily metabolized to Suc (e.g.…”

Section: The Suc-tre6p Nexusmentioning

confidence: 99%

A Tale of Two Sugars: Trehalose 6-Phosphate and Sucrose

2016

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Section: The Suc-tre6p Nexusmentioning

confidence: 99%

A Tale of Two Sugars: Trehalose 6-Phosphate and Sucrose

2016

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“…The class II TPS genes do not have TPS or TPP activities . The expression of the Arabidopsis and maize class II TPS genes is induced by Suc starvation (Henry et al, 2014;Yadav et al, 2014).…”

Section: Growth Arrest and Maintenance Of Cell Cycle Gene Expression mentioning

confidence: 99%

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Kebrom

Mullet

2016

Plant Physiol.

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Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorghum genotypes is similar until 6 d after planting when buds of phyB-1 arrest growth, while wild-type buds continue growing and develop into tillers. Transcriptome analysis at this early stage of bud development identified numerous genes that were up to 50-fold differentially expressed in wild-type/phyB-1 buds. Up-regulation of terminal flower1, GA2oxidase, and TPPI could protect axillary meristems in phyB-1 from precocious floral induction and decrease bud sensitivity to sugar signals. After bud growth arrest in phyB-1, expression of dormancy-associated genes such as DRM1, GT1, AF1, and CKX1 increased and ENOD93, ACCoxidase, ARR3/6/9, CGA1, and SHY2 decreased. Continued bud outgrowth in wild-type was correlated with increased expression of genes encoding a SWEET transporter and cell wall invertases. The SWEET transporter may facilitate Suc unloading from the phloem to the apoplast where cell wall invertases generate monosaccharides for uptake and utilization to sustain bud outgrowth. Elevated expression of these genes was correlated with higher levels of cytokinin/sugar signaling in growing buds of wild-type plants.

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“…Stresses that result in starvation, such as leaf shading, lead to low sugar and low T6P, thus promoting SnRK1 activation. SnRK1 in turn initiates metabolic reprograming to switch between anabolism and catabolism (Baena-González et al, 2007;Henry et al, 2014). This enables the plant to regulate metabolism and growth responses in relation to carbon status.…”

Section: The T6p-suc Ratio In Maize Varies Between Tissues and Stagesmentioning

confidence: 99%

“…Although the function of this group of TPS genes is unknown, in maize, these genes were shown previously to be closely regulated at the transcript level. Indeed, they were strongly induced in young leaf by prolonged darkness and then strongly repressed upon the return to light (Henry et al, 2014). These proteins have a similar structure to class I TPS but lack certain amino acids essential for substrate recognition and generally do not possess catalytic activity (Yang et al, 2012;Henry et al, 2014).…”

Section: The T6p-suc Ratio In Maize Varies Between Tissues and Stagesmentioning

confidence: 99%

“…T6P correlates with diurnal changes in Suc levels and in the response to exogenous Suc supply, suggesting a role as a Suc signal (Lunn et al, 2006(Lunn et al, , 2014Nunes et al, 2013;Yadav et al, 2014). The trehalose synthesis pathway is highly conserved throughout the plant kingdom (including in maize), where trehalose is formed in two steps (Wingler, 2002;Henry et al, 2014). First, UDP-Glc and Glc-6-P are condensed by the enzyme TREHALOSE-6-PHOSPHATE SYNTHASE (TPS) to produce T6P.…”

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Differential Role for Trehalose Metabolism in Salt-Stressed Maize

et al. 2015

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Little is known about how salt impacts primary metabolic pathways of C 4 plants, particularly related to kernel development and seed set. Osmotic stress was applied to maize (Zea mays) B73 by irrigation with increasing concentrations of NaCl from the initiation of floral organs until 3 d after pollination. At silking, photosynthesis was reduced to only 2% of control plants. Salt treatment was found to reduce spikelet growth, silk growth, and kernel set. Osmotic stress resulted in higher concentrations of sucrose (Suc) and hexose sugars in leaf, cob, and kernels at silking, pollination, and 3 d after pollination. Citric acid cycle intermediates were lower in salt-treated tissues, indicating that these sugars were unavailable for use in respiration. The sugar-signaling metabolite trehalose-6-phosphate was elevated in leaf, cob, and kernels at silking as a consequence of salt treatment but decreased thereafter even as Suc levels continued to rise. Interestingly, the transcripts of trehalose pathway genes were most affected by salt treatment in leaf tissue. On the other hand, transcripts of the SUCROSE NONFERMENTING-RELATED KINASE1 (SnRK1) marker genes were most affected in reproductive tissue. Overall, both source and sink strength are reduced by salt, and the data indicate that trehalose-6-phosphate and SnRK1 may have different roles in source and sink tissues. Kernel abortion resulting from osmotic stress is not from a lack of carbohydrate reserves but from the inability to utilize these energy reserves.

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The trehalose pathway in maize: conservation and gene regulation in response to the diurnal cycle and extended darkness

Abstract: SummaryExtended darkness induces a transient increase in sugars and trehalose pathway gene expression.

Cited by 56 publications

References 68 publications

A Tale of Two Sugars: Trehalose 6-Phosphate and Sucrose

A Tale of Two Sugars: Trehalose 6-Phosphate and Sucrose

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Differential Role for Trehalose Metabolism in Salt-Stressed Maize

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