Planteose is a major sugar translocated in Actinidia arguta ‘Hortgem Tahi’

Boldingh, Helen; Richardson, Annette; Minchin, P. E. H.; MacRae, Elspeth

doi:10.1016/j.scienta.2015.07.009

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…This is in agreement with the literature where Tre6P reduction lifts the inhibition on SnRK1, which is involved in the signalling of low-energy status in the tissue (Delatte et al 2011;Zhai et al 2018). This supports the Tre6P-SnRK1 link and that the carbohydrate metabolic regulation mechanism in heterotrophic tissues is not only limited to sucrose-translocating species (e.g., Z. mays; Bledsoe et al, 2017), but it is also extended to plant species that transport other sugars (e.g., kiwifruit; Boldingh et al, 2015).…”

Section: A Cis-acting Sre Reduces Myb27 Promoter Activity Under Higsupporting

confidence: 71%

“…Similarly, kiwifruit has an unusual primary metabolism where the tri‐saccharide planteose (6 F ‐α‐ d ‐galactosylsucrose) is a transitory storage carbohydrate in leaves (Klages et al ), with concentrations showing a diurnal pattern similar to that of starch in other plants. Both planteose and sucrose are major transport sugars in kiwifruit, equally represented in the phloem sap (Boldingh et al ). However, in contrast to sorbitol in apple fruit, kiwifruit fruits contain only trace amounts of planteose, and sucrose is also a minor sugar, whereas starch is the main form of transitory storage carbohydrate in fruits (Nardozza et al ).…”

Section: Introductionmentioning

confidence: 99%

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Carbon starvation reduces carbohydrate and anthocyanin accumulation in red‐fleshed fruit via trehalose 6‐phosphate and MYB27

Nardozza

Boldingh

Kashuba

et al. 2019

Plant Cell & Environment

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Kiwifruit (Actinidia spp.) is a recently domesticated fruit crop with several novel‐coloured cultivars being developed. Achieving uniform fruit flesh pigmentation in red genotypes is challenging. To investigate the cause of colour variation between fruits, we focused on a red‐fleshed Actinidia chinensis var. chinensis genotype. It was hypothesized that carbohydrate supply could be responsible for this variation. Early in fruit development, we imposed high or low (carbon starvation) carbohydrate supplies treatments; carbohydrate import or redistribution was controlled by applying a girdle at the shoot base. Carbon starvation affected fruit development as well as anthocyanin and carbohydrate metabolite concentrations, including the signalling molecule trehalose 6‐phosphate. RNA‐Seq analysis showed down‐regulation of both gene‐encoding enzymes in the anthocyanin and carbohydrate biosynthetic pathways. The catalytic trehalose 6‐phosphate synthase gene TPS1.1a was down‐regulated, whereas putative regulatory TPS7 and TPS11 were strongly up‐regulated. Unexpectedly, under carbon starvation MYB10, the anthocyanin pathway regulatory activator was slightly up‐regulated, whereas MYB27 was also up‐regulated and acts as a repressor. To link these two metabolic pathways, we propose a model where trehalose 6‐phosphate and the active repressor MYB27 are involved in sensing the carbon starvation status. This signals the plant to save resources and reduce the production of anthocyanin in fruits.

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Section: A Cis-acting Sre Reduces Myb27 Promoter Activity Under Higsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Carbon starvation reduces carbohydrate and anthocyanin accumulation in red‐fleshed fruit via trehalose 6‐phosphate and MYB27

Nardozza

Boldingh

Kashuba

et al. 2019

Plant Cell & Environment

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“…The relation between trehalose-6-phosphate and SnRK1 protein seems to be conserved in species that transport other sugars than sucrose. Kiwifruits transport both sucrose and the trisaccharide planteose through the phloem to heterotrophic tissues ( Boldingh et al., 2015 ). Under carbon starvation, the low levels of trehalose-6-phosphate in Zes006 kiwifruit removed the inhibition on SnRK1, which initiates the signaling of low-energy status ( Delatte et al., 2011 ; Nardozza et al., 2020 ).…”

Section: Sugar Signaling In Fruit Development and Ripening And Its Crmentioning

confidence: 99%

Sugar Signaling During Fruit Ripening

et al. 2020

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Sugars play a key role in fruit quality, as they directly influence taste, and thus consumer acceptance. Carbohydrates are the main resources needed by the plant for carbon and energy supply and have been suggested to be involved in all the important developmental processes, including embryogenesis, seed germination, stress responses, and vegetative and reproductive growth. Recently, considerable progresses have been made in understanding regulation of fruit ripening mechanisms, based on the role of ethylene, auxins, abscisic acid, gibberellins, or jasmonic acid, in both climacteric and non-climacteric fruits. However, the role of sugar and its associated molecular network with hormones in the control of fruit development and ripening is still poorly understood. In this review, we focus on sugar signaling mechanisms described up to date in fruits, describing their involvement in ripening-associated processes, such as pigments accumulation, and their association with hormone transduction pathways, as well as their role in stress-related responses.

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Genetics of Sugar and Starch Metabolism

Vizzotto

Falchi

2016

Compendium of Plant Genomes

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Planteose is a major sugar translocated in Actinidia arguta ‘Hortgem Tahi’

Cited by 9 publications

References 29 publications

Carbon starvation reduces carbohydrate and anthocyanin accumulation in red‐fleshed fruit via trehalose 6‐phosphate and MYB27

Carbon starvation reduces carbohydrate and anthocyanin accumulation in red‐fleshed fruit via trehalose 6‐phosphate and MYB27

Sugar Signaling During Fruit Ripening

Genetics of Sugar and Starch Metabolism

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