Zuckerrübenlagerung – vom Mikrobiom zum Transkriptom

Liebe, Sebastian; Varrelmann, Mark

doi:10.36961/si19118

Sugar Industry

2018

DOI: 10.36961/si19118

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Zuckerrübenlagerung – vom Mikrobiom zum Transkriptom

Sebastian Liebe¹,

Mark Varrelmann²

Abstract: Durch die zunehmende Verlängerung der Verarbeitungskampagne haben sowohl die Bedeutung der Zuckerrüben-lagerung in Feldrandmieten wie auch die dabei auftretenden Zuckerverluste zugenommen. Während der Lagerung wird die Zuckerrübe von Mikroorganismen besiedelt, die Lagerfäulen hervorrufen. Es wird vermutet, dass der dadurch entstehende Zuckerverlust auf die Aktivität von pflanzlichen und mikrobiellen Saccharose abbauenden Enzymen zurückzuführen ist, jedoch fehlte bisher der experimentelle Nachweis. Ziel der Unt… Show more

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Cited by 2 publications

References 41 publications

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Tissue composition and arrangement in sugar beet genotypes of different tissue strength with regard to damage and pathogen infestation

Nause¹,

Meier²,

Hoffmann³

2020

Sugar Industry

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Drought stress affects yield formation and quality of sugar beet. The aim of this study was to identify the growing period, in which drought stress has the greatest impact on growth, and furthermore, to analyze the response of different sugar beet genotypes. Causes for a different response should be identified. In pot experiments in the greenhouse, drought stress was simulated by reducing irrigation to 60% of the water holding capacity (WHC) for four weeks at various growth stages followed by re-watering. Growth reduction was greatest when drought stress occurred early in the season: the content of the quality-determining non-sugars was highest, sugar yield and beet diameter were lowest. Responses of the genotypes in sugar yield, but primarily in the accumulation of osmotically active substances differed. Despite re-watering after drought stress the restrictions could not be compensated during growth. The transpiration coefficient of the drought-stressed treatments was only slightly different to the control, because water consumption in the control did not either increase at average air temperatures beyond 23 °C. The strong effect of early drought stress could be attributed to the high growth rates, so that a limited water supply affected yield formation more than at later growth stages. The storage losses of sugar beet genotypes are closely related to damage during harvest and subsequent infestation with mould and rots. Genetic variation for storability seems to be primarily linked to textural properties of the roots such as the resistance against mechanical damage. However, no information is available about the tissue strength, tissue composition and structural organization leading to an enhanced resistance against damage and pathogen attack. Therefore, the aims of the study were the identification of genotypic differences concerning tissue strength of the beet, the relation to damage and pathogen infestation and the underlying physiological basis of tissue strength. Field trials were carried out with 6 genotypes at 2 locations in 2018. The roots were harvested in August and November. After harvest in November, a storage trial was carried out. The root strength increased from August to November. Beets with a high puncture resistance of the periderm also had a firm inner tissue. Genotypic differences in puncture resistance were not affected by the harvest time, indicating that this trait is stable throughout the growing period. A higher puncture resistance of the beet was related to a lower mould growth during storage. Genotypes with varying tissue strength also differed in fiber content (AIR), but the composition of AIR was stable over genotypes. The number of cambium rings seems not to essentially influence the tissue strength of the beet. In the further course of the project, microscopic analyzes will clarify, whether genotypic differences in tissue strength can be attributed to cell size or cell wall thickness.

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Tissue composition and arrangement in sugar beet genotypes of different tissue strength with regard to damage and pathogen infestation

Nause¹,

Meier²,

Hoffmann³

2020

Sugar Industry

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Methyl jasmonate effects on sugarbeet root responses to postharvest dehydration

Finger

Eide

Lafta

et al. 2021

PeerJ

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Background Sugarbeet (Beta vulgaris L.) roots are stored under conditions that cause roots to dehydrate, which increases postharvest losses. Although exogenous jasmonate applications can reduce drought stress in intact plants, their ability to alleviate the effects of dehydration in postharvest sugarbeet roots or other stored plant products is unknown. Research was conducted to determine whether jasmonate treatment could mitigate physiological responses to dehydration in postharvest sugarbeet roots. Methods Freshly harvested sugarbeet roots were treated with 10 µM methyl jasmonate (MeJA) or water and stored under dehydrating and non-dehydrating storage conditions. Changes in fresh weight, respiration rate, wound healing, leaf regrowth, and proline metabolism of treated roots were investigated throughout eight weeks in storage. Results Dehydrating storage conditions increased root weight loss, respiration rate, and proline accumulation and prevented leaf regrowth from the root crown. Under dehydrating conditions, MeJA treatment reduced root respiration rate, but only in severely dehydrated roots. MeJA treatment also hastened wound-healing, but only in the late stages of barrier formation. MeJA treatment did not impact root weight loss or proline accumulation under dehydrating conditions or leaf regrowth under non-dehydrating conditions. Both dehydration and MeJA treatment affected expression of genes involved in proline metabolism. In dehydrated roots, proline dehydrogenase expression declined 340-fold, suggesting that dehydration-induced proline accumulation was governed by reducing proline degradation. MeJA treatment altered proline biosynthetic and catabolic gene expression, with greatest effect in non-dehydrated roots. Overall, MeJA treatment alleviated physiological manifestations of dehydration stress in stored roots, although the beneficial effects were small. Postharvest jasmonate applications, therefore, are unlikely to significantly reduce dehydration-related storage losses in sugarbeet roots.

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Zuckerrübenlagerung – vom Mikrobiom zum Transkriptom

Cited by 2 publications

References 41 publications

Tissue composition and arrangement in sugar beet genotypes of different tissue strength with regard to damage and pathogen infestation

Tissue composition and arrangement in sugar beet genotypes of different tissue strength with regard to damage and pathogen infestation

Methyl jasmonate effects on sugarbeet root responses to postharvest dehydration

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