Abstract
The source-sink relationship determines crop yield, and it is largely regulated by water and nutrients in agricultural production. This has been widely investigated in cereals, but fewer studies have been conducted in root and tuber crops such as potato (Solanum tuberosum L.). The objective of this study was to investigate the source-sink relationship in potato and the regulation of water and nitrogen on the source-sink relationship during the tuber bulking stage. A pot experiment using virus-free plantlets of the Atlantic potato cultivar was conducted, using three water levels (50%, 70% and 90% of field capacity) and three nitrogen levels (0, 0.2, 0.4 g N∙kg-1 soil). The results showed that, under all water and nitrogen levels, plant source capacity were small at the end of the experiment, since photosynthetic activity in leaves were low and non-structural reserves in underground stems were completely remobilized. While at this time, there were very big differences in maximum and minimum tuber number and tuber weight, indicating that the sink tuber still had a large potential capacity to take in assimilates. These results suggest that the source-supplied assimilates were not sufficient enough to meet the demands of sink growth. Thus, we concluded that, unlike cereals, potato yield is more likely to be source-limited than sink-limited during the tuber bulking stage. Water and nitrogen are two key factors in potato production management. Our results showed that water level, nitrogen level and the interaction between water and nitrogen influence potato yield mainly through affecting source capacity via the net photosynthetic rate, total leaf area and leaf life span. Well-watered, sufficient nitrogen and well-watered combined with sufficient nitrogen increased yield mainly by enhancing the source capacity. Therefore, this suggests that increasing source capacity is more crucial to improve potato yield.
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Claims 9
Claim · model-written summary
Under all water and nitrogen levels, plant source capacity was small at the end of the experiment in potato.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- water and nitrogen levelse1
- Outcome
- plant source capacitye1
- Qualifier
- small at the end of the experimente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e1“under all water and nitrogen levels, plant source capacity were small at the end of the experiment”
Claim · model-written summary
Photosynthetic activity in potato leaves was low at the end of the experiment.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- leavese2
- Outcome
- photosynthetic activitye2
- Qualifier
- lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e2“photosynthetic activity in leaves were low”
Claim · model-written summary
Non-structural reserves in underground stems of potato were completely remobilized at the end of the experiment.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- underground stemse3
- Outcome
- non-structural reservese3
- Qualifier
- completely remobilizede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e3“non-structural reserves in underground stems were completely remobilized”
Claim · model-written summary
Maximum and minimum tuber number and tuber weight differed very greatly in potato, indicating a large potential sink capacity of the tuber.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- sink tubere5
- Outcome
- tuber number and tuber weighte4
- Qualifier
- very big differencese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e4“there were very big differences in maximum and minimum tuber number and tuber weight”
e5“the sink tuber still had a large potential capacity to take in assimilates”
Claim · model-written summary
Source-supplied assimilates were not sufficient to meet the demands of sink growth in potato (author interpretation).
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- sink growthe6
- Qualifier
- source-supplied assimilates were not sufficient enoughe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e6“source-supplied assimilates were not sufficient enough to meet the demands of sink growth”
Claim · model-written summary
Unlike cereals, potato yield is more likely to be source-limited than sink-limited during the tuber bulking stage (author conclusion).
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuber bulking stagee7
- Outcome
- potato yielde7
- Qualifier
- more likely to be source-limited than sink-limitede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e7“unlike cereals, potato yield is more likely to be source-limited than sink-limited during the tuber bulking stage”
Claim · model-written summary
Water level, nitrogen level and their interaction influence potato yield mainly through source capacity (net photosynthetic rate, total leaf area and leaf life span).
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- water level, nitrogen level and the interaction between water and nitrogene0
- Outcome
- potato yielde0
- Qualifier
- mainly through affecting source capacity via the net photosynthetic rate, total leaf area and leaf life spane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e0“water level, nitrogen level and the interaction between water and nitrogen influence potato yield mainly through affecting source capacity via the net photosynthetic rate, total leaf area and leaf life span”
Claim · model-written summary
Well-watered, sufficient nitrogen, and well-watered combined with sufficient nitrogen increased potato yield, mainly by enhancing source capacity.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Well-watered, sufficient nitrogene0
- Outcome
- yielde0
- Direction
- increasede0
- Qualifier
- mainly by enhancing the source capacitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e0“Well-watered, sufficient nitrogen and well-watered combined with sufficient nitrogen increased yield mainly by enhancing the source capacity”
Claim · model-written summary
Increasing source capacity is more crucial than other factors to improve potato yield (author recommendation).
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- increasing source capacitye0
- Outcome
- potato yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Source-Sink Relationship in Potato”
e0“increasing source capacity is more crucial to improve potato yield”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
108 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- negative
- positive
- no effect
128 papers more in this group
See all 132 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.