Abstract
Importance of the work: Drought is a production problem in Thailand for pummelo and the trees of this fruit have not been evaluated under drought stress.Objectives: To evaluate drought tolerance in nine Thai pummelo cultivars: Thongdee, Khaonamphueng, Khaoyai, Tubtimsiam, Takoy, Khaopan, Khaotaengga, Khaohom and Khaokrun.Materials & Methods: Air-layered pummelo trees (10 plants/cultivar) under drought stress were measured for their physiological and morphological responses (photosynthesis, stomatal conductance and transpiration rate, leaf greenness, relative water content, leaf water potential, proline content, total non-structural carbohydrate (TNC) and plant biomass).All cultivars were grouped based on principal component analysis (PCA).Results: Most parameters in all cultivars decreased after the plants were subjected to drought stress for 12 wk.The plant biomass and TNC decreased, while there were also decreases in the photosynthetic rate, stomatal conductance and transpiration rate to 79.4%, 87.3% and 71.6%, respectively, while leaf greenness decreased by 8.1%.The relative water content decreased by 9.6-37.3%,while the proline content increased 1.4-2.3times.All cultivars under the control treatment had leaf water potential values from -2.2 to -3.2 MPa and these values decreased to be in the range from -3.5 to -9.0 MPa under drought stress.The measurement results of physiological and morphological parameters and from the PCA were used to classify Khaokrun and Khaotaengga as tolerant pummelo cultivars, and Khaopan, Tubtimsiam and Khaonamphueng as moderately tolerant cultivars, while Takoy, Khaoyai and Thongdee were classified as susceptible cultivars.Main finding: The results could be used to manage pummelo orchards by selecting tolerant cultivars in drought risk areas.Further studies are required to develop drought-tolerant pummelo rootstock.
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Claims 12
Claim · model-written summary
Drought reduced pummelo biomass and total non-structural carbohydrate.
- Taxon
- pummelo
Citrus maximat0 - Treatment
- drought stresst1
- Outcome
- plant biomass and TNCe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant biomass and TNC decreased”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.)”
t1“under drought stress condition”
Claim · model-written summary
Drought reduced photosynthetic rate to 79.4%.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- photosynthetic ratee0
- Direction
- decreasese0
- Value
- 79.4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in the photosynthetic rate, stomatal conductance and transpiration rate to 79.4%, 87.3% and 71.6%, respectively”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Drought reduced stomatal conductance to 87.3%.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- stomatal conductancee0
- Direction
- decreasese0
- Value
- 87.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in the photosynthetic rate, stomatal conductance and transpiration rate to 79.4%, 87.3% and 71.6%, respectively”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Drought reduced transpiration rate to 71.6%.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- transpiration ratee0
- Direction
- decreasese0
- Value
- 71.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in the photosynthetic rate, stomatal conductance and transpiration rate to 79.4%, 87.3% and 71.6%, respectively”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Leaf greenness fell by 8.1% under drought.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- leaf greennesse0
- Direction
- decreasede0
- Value
- 8.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf greenness decreased by 8.1%”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Relative water content fell by 9.6-37.3% under drought.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- relative water contente0
- Direction
- decreasede0
- Value
- 9.6-37.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative water content decreased by 9.6-37.3%”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Proline content rose 1.4-2.3 times under drought.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresst0
- Outcome
- proline contente0
- Direction
- increasede0
- Value
- 1.4-2.3timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline content increased 1.4-2.3times”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.) under drought stress condition”
Claim · model-written summary
Leaf water potential shifted from -2.2 to -3.2 MPa in controls to -3.5 to -9.0 MPa under drought.
- Taxon
- pummeloCitrus maximat0
- Treatment
- drought stresse0
- Outcome
- leaf water potentiale0
- Direction
- decreasede0
- Value
- -3.5 to -9.0 MPae0
- Qualifier
- -2.2 to -3.2 MPae0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All cultivars under the control treatment had leaf water potential values from -2.2 to -3.2 MPa and these values decreased to be in the range from -3.5 to -9.0 MPa under drought stress”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.)”
Claim · model-written summary
Khaokrun and Khaotaengga were classified as drought tolerant.
- Taxon
- pummeloCitrus maximat0
- Material
- Khaokrun and Khaotaenggae0
- Outcome
- tolerant pummelo cultivarse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classify Khaokrun and Khaotaengga as tolerant pummelo cultivars”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.)”
Claim · model-written summary
Khaopan, Tubtimsiam and Khaonamphueng were moderately tolerant.
- Taxon
- pummeloCitrus maximat0
- Material
- Khaopan, Tubtimsiam and Khaonamphuenge0
- Outcome
- moderately tolerant cultivarse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Khaopan, Tubtimsiam and Khaonamphueng as moderately tolerant cultivars”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.)”
Claim · model-written summary
Takoy, Khaoyai and Thongdee were classified as susceptible.
- Taxon
- pummeloCitrus maximat0
- Material
- Takoy, Khaoyai and Thongdeee0
- Outcome
- susceptible cultivarse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Takoy, Khaoyai and Thongdee were classified as susceptible cultivars”
t0“pummelo cultivars (Citrus maxima (Burm.) Merr.)”
Claim · model-written summary
The authors suggest selecting tolerant cultivars for drought-risk orchards.
- Taxon
- pummeloCitrus maximae0
- Outcome
- selecting tolerant cultivars in drought risk arease0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“manage pummelo orchards by selecting tolerant cultivars in drought risk areas”
The same questions in other papers
drought · quality: sugar starch · Citrus maxima (pummelo)Positive and negative results
1 in the opposite direction
- positive
drought · physiology: water · Citrus maxima (pummelo)Results agree
1 paper in the same direction as this paper
- negative
drought · physiology: photosynthesis · Citrus maxima (pummelo)Results agree
2 papers in the same direction as this paper
- negative
- 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.