Abstract
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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Claims 14
Claim · model-written summary
Growth reduction in sugar beet was greatest when drought stress occurred early in the season.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- drought stress occurred early in the seasone0
- Outcome
- Growth reductione0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth reduction was greatest when drought stress occurred early in the season”
t0“sugar beet”
Claim · model-written summary
With early drought stress the content of quality-determining non-sugars in sugar beet was highest.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- drought stress occurred early in the seasone0
- Outcome
- content of the quality-determining non-sugarse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“sugar beet”
Claim · model-written summary
With early drought stress sugar yield and beet diameter of sugar beet were lowest.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- drought stress occurred early in the seasone0
- Outcome
- sugar yield and beet diametere0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“sugar beet”
Claim · model-written summary
Sugar beet genotypes differed in sugar yield, but primarily in accumulation of osmotically active substances, under drought.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- sugar yield, but primarily in the accumulation of osmotically active substancese0
- Direction
- differede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responses of the genotypes in sugar yield, but primarily in the accumulation of osmotically active substances differed”
t0“sugar beet”
Claim · model-written summary
Despite re-watering after drought stress, the growth restrictions could not be compensated during growth.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- re-wateringe0
- Outcome
- restrictionse0
- Direction
- could not be compensatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Despite re-watering after drought stress the restrictions could not be compensated during growth”
t0“sugar beet”
Claim · model-written summary
The transpiration coefficient of the drought-stressed treatments was only slightly different from the control.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- drought-stressed treatmentse0
- Outcome
- transpiration coefficiente0
- Direction
- only slightly differente0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transpiration coefficient of the drought-stressed treatments was only slightly different to the control”
t0“sugar beet”
Claim · model-written summary
The strong effect of early drought stress is attributed to high growth rates, so limited water supply affected yield formation more than at later growth stages.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- early drought stresse0
- Outcome
- yield formatione0
- Qualifier
- high growth ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“sugar beet”
Claim · model-written summary
Root strength of sugar beet increased from August to November.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- roote0
- Outcome
- root strengthe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root strength increased from August to November”
t0“sugar beet”
Claim · model-written summary
Beets with a high puncture resistance of the periderm also had a firm inner tissue.
- Taxon
- Beets
Beta vulgarise0 - Organ / stage
- periderme0
- Outcome
- firm inner tissuee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beets with a high puncture resistance of the periderm also had a firm inner tissue”
Claim · model-written summary
Genotypic differences in puncture resistance were not affected by harvest time.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- harvest timee0
- Outcome
- Genotypic differences in puncture resistancee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypic differences in puncture resistance were not affected by the harvest time”
t0“sugar beet”
Claim · model-written summary
A higher puncture resistance of the beet was related to lower mould growth during storage.
- Taxon
- beetBeta vulgarise0
- Interactor
- moulde0pathogen
- Outcome
- mould growth during storagee0
- Direction
- lowere0
- Qualifier
- higher puncture resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A higher puncture resistance of the beet was related to a lower mould growth during storage”
Claim · model-written summary
Sugar beet genotypes with varying tissue strength differed in fiber content (AIR).
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- fiber content (AIR)e0
- Direction
- differede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes with varying tissue strength also differed in fiber content (AIR), but the composition of AIR was stable over genotypes”
t0“sugar beet”
Claim · model-written summary
The composition of AIR was stable over sugar beet genotypes.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- composition of AIRe0
- Direction
- stablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes with varying tissue strength also differed in fiber content (AIR), but the composition of AIR was stable over genotypes”
t0“sugar beet”
Claim · model-written summary
The number of cambium rings seems not to essentially influence the tissue strength of the beet.
- Taxon
- beetBeta vulgarise0
- Organ / stage
- cambium ringse0
- Outcome
- tissue strengthe0
- Direction
- not to essentially influencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of cambium rings seems not to essentially influence the tissue strength of the beet”
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