Abstract
Low soil phosphorus(P) availability and seasonal drought were the main limiting factors for soybean production in acid red soils of South China.Improving and screening P-efficient genotypes of soybean germplasm which could better adapt to low P soils and drought climate was one of the efficient approaches to increasing soybean yields.Pot experiment with P-efficient(BX10) and P-inefficient(BD2) soybean genotypes was conducted to investigate the effects of P application and water deficit on dry matter accumulation and phosphorus efficiency of soybean plants.Three rates of P application were P0: 0,P1: 15,P2: 30 mg/kg soil,respectively.The two soil moisture treatments were 70%—80% of field water capacity(FWC) as control and 30%—40% of FWC as drought stress at flowering and pod-setting stages respectively.The results showed that plant biomass and leaf chlorophyll content were increased,while root/shoot ratio of the two soybean varieties were decreased when soil available P increased;Drought stress increased root/shoot ratio of BX10 and BD2 at flowing and pod-setting stages under the same P application rate,but no significant effects were found on leaf chlorophyll content.Drought stress resulted in significant decrease of yield for both two varieties.Soybean yields in low P soils are significantly affected by medium P application(P1 treatment),but much less and even negatively by high P application(P2 treatment).The yield of BX10 was increased when soil available P increased,but the yields for BD2 in different P application rates were in the order: P1P2P0.BX 10 had higher yield than BD2 under all phosphorus and water treatments.Whatever drought stress in flowering or pod-setting stage,root phosphorus efficiency ratio,P uptake efficiency and P transfer efficiency of plant were increased when available soil P increased,in contrast,P utilization efficiency was decreased with the increase of P application level.In total,BX10 had higher level in P absorption efficiency and utilization efficiency,while relatively lower level in root P efficiency ratio and P transfer efficiency than BD2.
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Claims 14
Claim · model-written summary
Higher soil phosphorus increased soybean biomass and leaf chlorophyll.
- Taxon
- soybean
Glycine maxt0 - Treatment
- soil available P increasede0
- Outcome
- plant biomass and leaf chlorophyll contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant biomass and leaf chlorophyll content were increased,while root/shoot ratio of the two soybean varieties were decreased when soil available P increased”
t0“soybean plants”
Claim · model-written summary
Higher soil phosphorus decreased the root/shoot ratio of both soybean varieties.
- Taxon
- soybeanGlycine maxe0
- Treatment
- soil available P increasede0
- Outcome
- root/shoot ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root/shoot ratio of the two soybean varieties were decreased when soil available P increased”
Claim · model-written summary
Drought increased root/shoot ratio in BX10 and BD2 at flowering and pod setting.
- Material
- BX10 and BD2e0
- Treatment
- Drought stresse0
- Outcome
- root/shoot ratioe0
- Direction
- increasede0
- Comparator
- same P application ratee0
Not reportedTaxon
Verbatim
e0“Drought stress increased root/shoot ratio of BX10 and BD2 at flowing and pod-setting stages under the same P application rate”
Claim · model-written summary
Drought had no significant effect on leaf chlorophyll content.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Drought stresse0
- Outcome
- leaf chlorophyll contente0
- Direction
- no significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress increased root/shoot ratio of BX10 and BD2 at flowing and pod-setting stages under the same P application rate,but no significant effects were found on leaf chlorophyll content”
t0“soybean plants”
Claim · model-written summary
Drought significantly decreased yield in both soybean varieties.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Drought stresse0
- Outcome
- yielde0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress resulted in significant decrease of yield for both two varieties.”
t0“soybean plants”
Claim · model-written summary
Medium phosphorus application significantly affected soybean yield on low P soil.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- medium P application(P1 treatment)e0
- Outcome
- Soybean yieldse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean yields in low P soils are significantly affected by medium P application(P1 treatment)”
Claim · model-written summary
High phosphorus application affected soybean yield less or negatively.
- Taxon
- soybeanGlycine maxt0
- Treatment
- high P application(P2 treatment)e0
- Outcome
- much less and even negativelye0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but much less and even negatively by high P application(P2 treatment).”
t0“soybean plants”
Claim · model-written summary
BX10 yield rose with soil available phosphorus.
- Taxon
- soybeanGlycine maxt0
- Material
- BX10e0
- Treatment
- soil available P increasede0
- Outcome
- yield of BX10e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of BX10 was increased when soil available P increased”
t0“soybean plants”
Claim · model-written summary
BD2 yield was ranked P1, P2, P0.
- Taxon
- soybeanGlycine maxt0
- Material
- BD2e0
- Outcome
- yields for BD2e0
- Qualifier
- P1P2P0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yields for BD2 in different P application rates were in the order: P1P2P0”
t0“soybean plants”
Claim · model-written summary
BX10 yielded more than BD2 across all phosphorus and water treatments.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BX 10 had higher yield than BD2 under all phosphorus and water treatments.”
t0“soybean plants”
Claim · model-written summary
Increasing available P increased root P efficiency ratio, P uptake efficiency and P transfer efficiency.
- Taxon
- soybeanGlycine maxt0
- Treatment
- available soil P increasede0
- Outcome
- root phosphorus efficiency ratio,P uptake efficiency and P transfer efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root phosphorus efficiency ratio,P uptake efficiency and P transfer efficiency of plant were increased when available soil P increased”
t0“soybean plants”
Claim · model-written summary
Increasing P application decreased P utilization efficiency.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increase of P application levele0
- Outcome
- P utilization efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P utilization efficiency was decreased with the increase of P application level”
t0“soybean plants”
Claim · model-written summary
BX10 had greater P absorption and utilization efficiency than BD2.
- Taxon
- soybeanGlycine maxt0
- Material
- BX10e0
- Outcome
- P absorption efficiency and utilization efficiencye0
- Direction
- highere0
- Comparator
- BD2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BX10 had higher level in P absorption efficiency and utilization efficiency,while relatively lower level in root P efficiency ratio and P transfer efficiency than BD2.”
t0“soybean plants”
Claim · model-written summary
BX10 had lower root P efficiency ratio and P transfer efficiency than BD2.
- Material
- BX10e0
- Outcome
- root P efficiency ratio and P transfer efficiencye0
- Direction
- lowere0
- Comparator
- BD2e0
Not reportedTaxon
Verbatim
e0“BX10 had higher level in P absorption efficiency and utilization efficiency,while relatively lower level in root P efficiency ratio and P transfer efficiency than BD2.”
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