Abstract
In this study we analysed the influence of drought stress on the leaf morphological characteristics, osmotic adjustment substances, antioxidant enzymes, and resistance-related photosynthetic physiological indices of Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct). The leaf relative water content and leaf area of the three rootstocks decreased with increasing drought stress, with the smallest decrease in Cj. The relative conductivity and malondialdehyde content increased with increasing drought stress. Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity. The net photosynthetic rate, stomatal conductance, transpiration rate, and chlorophyll a and b content were all lower than those of the control, whereas intercellular CO2 concentration increased with increasing drought stress. The initial fluorescence and maximal quantum yield of PSII were approximately equal for all rootstocks but increased with increasing drought stress severity. The combined analysis of physiological indicators, membership function, and principal components indicated that the drought resistance of grafted H. tangor decreased in the order Cj > Ct > Pt.
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Claims 14
Claim · model-written summary
Increasing drought stress decreased leaf relative water content and leaf area of Harumi tangor on all three rootstocks.
- Taxon
- Harumi tangore0
- Material
- three rootstockse1
- Treatment
- increasing drought stresse1
- Outcome
- leaf relative water content and leaf areae1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e1“The leaf relative water content and leaf area of the three rootstocks decreased with increasing drought stress, with the smallest decrease in Cj”
Claim · model-written summary
Cj rootstock showed the smallest decrease in leaf relative water content and leaf area under drought.
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e1“The leaf relative water content and leaf area of the three rootstocks decreased with increasing drought stress, with the smallest decrease in Cj”
Claim · model-written summary
Increasing drought stress increased relative conductivity and malondialdehyde content in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- increasing drought stresse2
- Outcome
- relative conductivity and malondialdehyde contente2
- Direction
- increasede2
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e2“The relative conductivity and malondialdehyde content increased with increasing drought stress”
Claim · model-written summary
Drought stress increased proline, total soluble sugar and soluble protein in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- drought stresse3
- Outcome
- Proline, total soluble sugar, soluble proteine3
- Direction
- increasede3
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e3“Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity”
Claim · model-written summary
Drought stress increased superoxide dismutase, ascorbate peroxidase and catalase activities in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- drought stresse3
- Outcome
- activities of superoxide dismutase, ascorbate peroxidase, and catalasee3
- Direction
- increasede3
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e3“Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity”
Claim · model-written summary
Severe drought stress decreased proline, total soluble sugar and soluble protein in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- severe drought stresse3
- Outcome
- Proline, total soluble sugar, soluble proteine3
- Direction
- decreasede3
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e3“Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity”
Claim · model-written summary
Severe drought stress decreased superoxide dismutase, ascorbate peroxidase and catalase activities in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- severe drought stresse3
- Outcome
- activities of superoxide dismutase, ascorbate peroxidase, and catalasee3
- Direction
- decreasede3
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e3“Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity”
Claim · model-written summary
Cj rootstock showed the greatest increase in enzyme activity under drought.
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e3“Proline, total soluble sugar, soluble protein, and activities of superoxide dismutase, ascorbate peroxidase, and catalase increased with drought stress but decreased under severe drought stress, with Cj exhibiting the greatest increase in enzyme activity”
Claim · model-written summary
Increasing drought stress lowered net photosynthetic rate, stomatal conductance and transpiration rate relative to the control in Harumi tangor.
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e4“The net photosynthetic rate, stomatal conductance, transpiration rate, and chlorophyll a and b content were all lower than those of the control, whereas intercellular CO2 concentration increased with increasing drought stress”
Claim · model-written summary
Increasing drought stress lowered chlorophyll a and b content relative to the control in Harumi tangor.
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e4“The net photosynthetic rate, stomatal conductance, transpiration rate, and chlorophyll a and b content were all lower than those of the control, whereas intercellular CO2 concentration increased with increasing drought stress”
Claim · model-written summary
Increasing drought stress increased intercellular CO2 concentration in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- increasing drought stresse4
- Outcome
- intercellular CO2 concentratione4
- Direction
- increasede4
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e4“The net photosynthetic rate, stomatal conductance, transpiration rate, and chlorophyll a and b content were all lower than those of the control, whereas intercellular CO2 concentration increased with increasing drought stress”
Claim · model-written summary
Increasing drought stress severity increased initial fluorescence and maximal quantum yield of PSII in Harumi tangor.
- Taxon
- Harumi tangore0
- Treatment
- increasing drought stress severitye5
- Outcome
- initial fluorescence and maximal quantum yield of PSIIe5
- Direction
- increasede5
Not reportedComparator
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e5“The initial fluorescence and maximal quantum yield of PSII were approximately equal for all rootstocks but increased with increasing drought stress severity”
Claim · model-written summary
Initial fluorescence and maximal quantum yield of PSII were approximately equal among rootstocks of Harumi tangor.
Verbatim
e0“Harumi tangor plants grafted onto Poncirus trifoliata (Pt), Citrus junos (Cj), and Citrus tangerine (Ct)”
e5“The initial fluorescence and maximal quantum yield of PSII were approximately equal for all rootstocks but increased with increasing drought stress severity”
Claim · model-written summary
Drought resistance of grafted H. tangor decreased in the order Cj > Ct > Pt.
Verbatim
e6“the drought resistance of grafted H. tangor decreased in the order Cj > Ct > Pt”