Abstract
Abstract Sugar beet (Beta vulgaris L.) is cultivated mainly on saline soils. Low levels of salinity stimulate growth of this crop plant possibly due to production of broader leaves as sources of assimilates. In this work, six cultivars were studied under mild salinity (EC = 5.5 dS m−1) in a field experiment to analyse its effect on growth parameters and yield of storage root and sugar accumulation. An attempt was also made to determine the contributing role of photosynthetic gas exchange in response of sugar beet plants to salinity. Production of greater leaf area in salinized plants occurred only transitionally in the early growth period; in progression of the growing season it was decreased, and at 3rd harvest (100 days after treatment) it was significantly lower compared with control plants without cultivar differences. Leaf chlorophyll fluorescence, net photosynthesis rate, and stomatal conductance did not change by salinity significantly. Although, at the end of growth season, leaf area and potential photosynthesizing component of salinized plants on the basis of leaf area (LAR) or weight (LWR) were significantly lower than for control plants, weight of storage root and sugar content were up to 90 and 37% higher than in control plants, respectively. Consequently, a considerable higher yield under mild salinity conditions in sugar beet is not attributable to higher leaf area or, therefore, higher photosynthetic capacity of whole plants. Indeed, the storage roots benefit from lower dry matter and surface production of shoot during the late growing season (because of lower nitrogen assimilation and a slight drought stress of salinized plants) and a change in dry-matter partitioning in favor of roots takes place. However, a possible special effect of Na on carbon allocation for storage and structure and involvement of growth regulators in the change of root-shoot allometry could not be excluded.
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Claims 7
Claim · model-written summary
Salinity transiently increased leaf area early in growth.
- Taxon
- Sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- salinizede0
- Outcome
- leaf areae0
- Direction
- greatere0
- Qualifier
- early growth periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Production of greater leaf area in salinized plants occurred only transitionally in the early growth period”
t0“Sugar beet (Beta vulgaris L.)”
Claim · model-written summary
By the third harvest, leaf area was significantly lower under salinity than in controls.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- salinizede1
- Outcome
- leaf areae1
- Direction
- lowere0
- Qualifier
- 3rd harvest (100 days after treatment)e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 3rd harvest (100 days after treatment) it was significantly lower compared with control plants without cultivar differences”
t0“Sugar beet (Beta vulgaris L.)”
e1“Production of greater leaf area in salinized plants occurred only transitionally in the early growth period”
Claim · model-written summary
Leaf chlorophyll fluorescence, photosynthesis and stomatal conductance did not change significantly with salinity.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- salinitye0
- Outcome
- Leaf chlorophyll fluorescence, net photosynthesis rate, and stomatal conductancee0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf chlorophyll fluorescence, net photosynthesis rate, and stomatal conductance did not change by salinity significantly”
t0“Sugar beet (Beta vulgaris L.)”
Claim · model-written summary
Late-season leaf area and photosynthesizing components were significantly lower under salinity.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- salinizede0
- Outcome
- leaf area and potential photosynthesizing componente0
- Direction
- lowere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf area and potential photosynthesizing component of salinized plants on the basis of leaf area (LAR) or weight (LWR) were significantly lower than for control plants”
t0“Sugar beet (Beta vulgaris L.)”
Claim · model-written summary
Storage root weight was up to 90% higher under salinity.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- salinizede1
- Outcome
- weight of storage roote0
- Direction
- highere0
- Value
- 90 and 37%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weight of storage root and sugar content were up to 90 and 37% higher than in control plants, respectively”
t0“Sugar beet (Beta vulgaris L.)”
e1“Production of greater leaf area in salinized plants occurred only transitionally in the early growth period”
Claim · model-written summary
Sugar content was up to 37% higher under salinity.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- salinizede1
- Outcome
- sugar contente0
- Direction
- highere0
- Value
- 37%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weight of storage root and sugar content were up to 90 and 37% higher than in control plants, respectively”
t0“Sugar beet (Beta vulgaris L.)”
e1“Production of greater leaf area in salinized plants occurred only transitionally in the early growth period”
Claim · model-written summary
The authors attribute higher yield under mild salinity to altered allocation toward roots rather than greater photosynthetic area.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- dry-matter partitioning in favor of rootse0
- Qualifier
- in favor of rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a change in dry-matter partitioning in favor of roots takes place”
t0“Sugar beet (Beta vulgaris L.)”
The same questions in other papers
salinity · quality: sugar starch · Beta vulgaris (beet)Results differ
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See all 14 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.