Abstract
This work aimed at comprehensive phenotyping of starch potato cultivars in response to N-deficiency and drought stress at the morphological, physiological and biochemical level. For this purpose, 17 European potato cultivars were investigated in two years pot trials in a rain-out shelter with two N-levels and two water supply regimes. Additionally, a broad in vitro screening was performed to monitor specific traits under different N-levels in dependence of the genotype. Furthermore, out of these two contrasting genotypes were analysed in a proteomic approach to identify proteins associated with genotype specific responses to N-deficiency. With regard to tuber and starch yield cv. Tomba proved to be comparatively tolerant and cv. Kiebitz rather sensitive under both, N-deficiency and drought stress. Other cultivars responded differentially depending on the type of stress. Nitrogen use efficiency generally increased under N-deficiency. Water use efficiency decreased under limited water supply, but was increased by increased N-supply. Biochemical and physiological parameters of leaves were analysed at two time points during a drought stress phase. The proline content increased under drought, while the N-supply level had an effect on the speed and extent of its accumulation. The content of total soluble sugars increased at short-term drought and dropped back at long-term drought, which was more pronounced at higher N-supply. The leaf water potential decreased rapidly under drought, however, significant osmotic adjustment was not detected. Correlations of biochemical or physiological parameters to agronomic traits were too weak to serve as markers for abiotic stress tolerance. In vitro assays disclosed significant differences between cultivars in the ability to maintain biomass production, photosynthesis and N-metabolization under decreased N-supply. Furthermore, genotype dependent responses were detected regarding the root to shoot ratio, which was increased under N-deficiency in some specific cultivars. The proteomic analysis revealed that 21 % of the detected proteins differed in abundance between the sensitive and the tolerant genotype. In control and N-deficiency conditions 19.5 % were differentially accumulated in the sensitive and 15 % in the tolerant genotype. Out of a total of 106 differentially abundant proteins, only eight were detected in both genotypes, which were mainly associated with general stress response. In the tolerant genotype, the determined high chlorophyll content was associated with an increase of respective catabolic enzymes. In particular, rubisco activaseshowed interesting modulations in dependence of genotypes and N-levels. This dissertation was only published as a printed edition.
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Claims 20
Claim · model-written summary
Tomba was comparatively tolerant for tuber and starch yield under nitrogen deficiency and drought.
- Taxon
- potatoes
Solanum tuberosumt0 - Material
- cv. Tombae0
- Outcome
- tuber and starch yielde0
- Direction
- comparatively tolerante0
- Qualifier
- N-deficiency and drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With regard to tuber and starch yield cv. Tomba proved to be comparatively tolerant and cv. Kiebitz rather sensitive under both, N-deficiency and drought stress.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Kiebitz was rather sensitive for tuber and starch yield under nitrogen deficiency and drought.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- cv. Kiebitze0
- Outcome
- tuber and starch yielde0
- Direction
- rather sensitivee0
- Qualifier
- N-deficiency and drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With regard to tuber and starch yield cv. Tomba proved to be comparatively tolerant and cv. Kiebitz rather sensitive under both, N-deficiency and drought stress.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Other potato cultivars responded differently according to stress type.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- responded differentiallye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other cultivars responded differentially depending on the type of stress.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Nitrogen use efficiency generally increased under nitrogen deficiency.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- N-deficiencye0
- Outcome
- Nitrogen use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency generally increased under N-deficiency.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Water use efficiency decreased under limited water supply.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- limited water supplye0
- Outcome
- Water use efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency decreased under limited water supply”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Increased nitrogen supply increased water use efficiency.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- increased N-supplye0
- Outcome
- Water use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency decreased under limited water supply, but was increased by increased N-supply.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Leaf proline content increased under drought.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- droughte0
- Outcome
- proline contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proline content increased under drought”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Nitrogen supply affected the speed and extent of proline accumulation.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- N-supply levele0
- Outcome
- speed and extent of its accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N-supply level had an effect on the speed and extent of its accumulation”
e1“The proline content increased under drought”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Total soluble sugars increased under short term drought.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- short-term droughte0
- Outcome
- content of total soluble sugarse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of total soluble sugars increased at short-term drought”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Total soluble sugars fell back under long term drought, more strongly with higher nitrogen supply.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- long-term droughte0
- Outcome
- content of total soluble sugarse0
- Direction
- dropped backe0
- Qualifier
- higher N-supplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of total soluble sugars increased at short-term drought and dropped back at long-term drought, which was more pronounced at higher N-supply.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Leaf water potential rapidly decreased under drought.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- droughte0
- Outcome
- leaf water potentiale0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf water potential decreased rapidly under drought”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Significant osmotic adjustment was not detected during drought.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- osmotic adjustment was not detectede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant osmotic adjustment was not detected”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Biochemical and physiological traits correlated too weakly with agronomic traits to be stress tolerance markers.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- Correlations of biochemical or physiological parameters to agronomic traitse0
- Direction
- too weake0
- Qualifier
- abiotic stress tolerancee0
- Comparator
- agronomic traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Correlations of biochemical or physiological parameters to agronomic traits were too weak to serve as markers for abiotic stress tolerance.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Cultivars differed significantly in maintaining biomass production, photosynthesis and nitrogen metabolism under reduced nitrogen supply.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- decreased N-supplye0
- Outcome
- ability to maintain biomass production, photosynthesis and N-metabolizatione0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In vitro assays disclosed significant differences between cultivars in the ability to maintain biomass production, photosynthesis and N-metabolization under decreased N-supply.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Nitrogen deficiency increased root to shoot ratio in some cultivars.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- N-deficiencye0
- Outcome
- root to shoot ratioe0
- Direction
- increasede0
- Qualifier
- some specific cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root to shoot ratio, which was increased under N-deficiency in some specific cultivars.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Protein abundance differed between sensitive and tolerant genotypes for 21 % of detected proteins.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- detected proteins differed in abundancee0
- Direction
- differede0
- Value
- 21 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“21 % of the detected proteins differed in abundance between the sensitive and the tolerant genotype.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
In control and nitrogen deficient conditions, 19.5 % of proteins were differentially accumulated in the sensitive genotype.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- sensitivee0
- Outcome
- differentially accumulatede0
- Value
- 19.5 %e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In control and N-deficiency conditions 19.5 % were differentially accumulated in the sensitive and 15 % in the tolerant genotype.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
In control and nitrogen deficient conditions, 15 % of proteins were differentially accumulated in the tolerant genotype.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- tolerant genotypee0
- Outcome
- differentially accumulatede0
- Value
- 15 %e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In control and N-deficiency conditions 19.5 % were differentially accumulated in the sensitive and 15 % in the tolerant genotype.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
Only eight of 106 differentially abundant proteins occurred in both genotypes and were mainly linked to general stress response.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- differentially abundant proteinse0
- Value
- eighte0
- Qualifier
- Out of a total of 106e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Out of a total of 106 differentially abundant proteins, only eight were detected in both genotypes, which were mainly associated with general stress response.”
t0“potatoes (Solanum tuberosum L.)”
Claim · model-written summary
High chlorophyll content in the tolerant genotype was associated with increased catabolic enzymes, and rubisco activase varied with genotype and nitrogen level.
- Taxon
- potatoesSolanum tuberosumt0
- Gene
- catabolic enzymese0
- Outcome
- high chlorophyll contente0
- Direction
- highe0
- Qualifier
- tolerant genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the tolerant genotype, the determined high chlorophyll content was associated with an increase of respective catabolic enzymes. In particular, rubisco activaseshowed interesting modulations in dependence of genotypes and N-levels.”
t0“potatoes (Solanum tuberosum L.)”
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