Abstract
Osmotic adjustments play a fundamental role in plant responses to water deficit. For apple ( Malus domestica ) trees growing in the primary production areas of China, drought and low phosphorus (P) levels are the main sources of abiotic stress. Although tolerance to drought and low P are important breeding goals for cultivar improvement, there is little information on natural variation within Malus for these traits or the molecular mechanisms that may mediate tolerance. In this study, it was found that in plants grown under conditions of osmotic and low P stress, electrolyte leakage and photosynthetic parameters were significantly higher, but chlorophyll concentrations were lower compared with nonstressed plants. These physiological indicators revealed that, under low P condition, the order of osmotic stress resistance (high to low) was Malus sieversii (Ms) → Malus prunifolia (Mp) → Malus hupehensis (Mh). Expression of the phosphorus transporter genes PHT1;7 , PHT1;12 , and PHT2;1 in the roots and PHT1;12 and PHT4;5 in the leaves was positively correlated with plant osmotic resistance. It is proposed that the highly expressed PHT genes might improve P absorption and transport efficiency, resulting in the high osmotic stress resistance under low P level conditions in Malus species.
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Claims 6
Claim · model-written summary
Electrolyte leakage and photosynthetic parameters were significantly higher under osmotic and low P stress than in nonstressed plants.
- Taxon
- Malus domestica
Malus domesticae0 - Treatment
- osmotic and low P stresse1
- Outcome
- electrolyte leakage and photosynthetic parameterse1
- Direction
- highere1
- Comparator
- nonstressed plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For apple ( Malus domestica ) trees growing in the primary production areas of China”
e1“in plants grown under conditions of osmotic and low P stress, electrolyte leakage and photosynthetic parameters were significantly higher, but chlorophyll concentrations were lower compared with nonstressed plants”
Claim · model-written summary
Chlorophyll concentrations were lower under osmotic and low P stress than in nonstressed plants.
- Taxon
- Malus domesticaMalus domesticae0
- Treatment
- osmotic and low P stresse1
- Outcome
- chlorophyll concentrationse1
- Direction
- lowere1
- Comparator
- nonstressed plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For apple ( Malus domestica ) trees growing in the primary production areas of China”
e1“in plants grown under conditions of osmotic and low P stress, electrolyte leakage and photosynthetic parameters were significantly higher, but chlorophyll concentrations were lower compared with nonstressed plants”
Claim · model-written summary
Osmotic stress resistance was ranked from high to low as Malus sieversii, Malus prunifolia and Malus hupehensis under low P.
- Taxon
- Malus domesticaMalus domesticae0
- Material
- Malus sieversiie2
- Treatment
- low P conditione2
- Outcome
- osmotic stress resistancee2
- Direction
- high to lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For apple ( Malus domestica ) trees growing in the primary production areas of China”
e2“These physiological indicators revealed that, under low P condition, the order of osmotic stress resistance (high to low) was Malus sieversii (Ms) → Malus prunifolia (Mp) → Malus hupehensis (Mh)”
Claim · model-written summary
Expression of PHT1;7, PHT1;12 and PHT2;1 in roots was positively correlated with osmotic resistance.
- Taxon
- Malus domesticaMalus domesticae0
- Organ / stage
- rootse3
- Gene
- PHT1;7 , PHT1;12 , and PHT2;1e3
- Outcome
- Expression of the phosphorus transporter genese3
- Direction
- positively correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For apple ( Malus domestica ) trees growing in the primary production areas of China”
e3“Expression of the phosphorus transporter genes PHT1;7 , PHT1;12 , and PHT2;1 in the roots and PHT1;12 and PHT4;5 in the leaves was positively correlated with plant osmotic resistance”
Claim · model-written summary
Expression of PHT1;12 and PHT4;5 in leaves was positively correlated with osmotic resistance.
- Taxon
- Malus domesticaMalus domesticae0
- Organ / stage
- leavese3
- Gene
- PHT1;12 and PHT4;5e3
- Outcome
- Expression of the phosphorus transporter genese3
- Direction
- positively correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For apple ( Malus domestica ) trees growing in the primary production areas of China”
e3“Expression of the phosphorus transporter genes PHT1;7 , PHT1;12 , and PHT2;1 in the roots and PHT1;12 and PHT4;5 in the leaves was positively correlated with plant osmotic resistance”
Claim · model-written summary
Highly expressed PHT genes may improve P absorption and transport efficiency, giving high osmotic stress resistance under low P.
- Gene
- highly expressed PHT genese4
- Outcome
- osmotic stress resistancee4
- Qualifier
- P absorption and transport efficiencye4
MalusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“It is proposed that the highly expressed PHT genes might improve P absorption and transport efficiency, resulting in the high osmotic stress resistance under low P level conditions in Malus species”
The same questions in other papers
phosphorus · physiology: pigments · Malus domestica (apple)Positive and negative results
1 in the opposite direction
- positive
phosphorus · physiology: photosynthesis · Malus domestica (apple)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.