Abstract
Abstract Climate change has increased extreme weather events frequency and intensity. Although the incidence of high temperatures has been studied on several plant species, the study of low temperatures has been relegated to the background, whereas crops as citrus could be particularly sensitive to chilling due to their origins in tropical and subtropical areas. In this work, plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM), were subjected to cold stress at 10/4ºC (day/night) temperature, maintaining control plants at 25/18 ºC, with a 16 h photoperiod. Leaf tissue was sampled after 3 and 7 days for further analyses. The results exhibited a similar photosynthetic response in both genotypes, decreasing of gas exchange parameters. The study of different osmoprotectants revealed a major role of proline and soluble sugars in the osmotic response of citrus to chilling. Notably, CC exhibited a greater capacity to increase proline content, while CM maintained higher basal levels of this compound. Phytohormone analysis denoted the importance of abscisic acid (ABA) compared to other plant hormones. CC plants had a higher capacity to modulate ABA content than CM ones, which could lead to a higher tolerance, reflected by the lower chlorophyll degradation and lower oxidative stress (marked as malondialdehyde content) of CC compared to CM. These results suggest that, although both genotypes exhibit a moderate tolerance to chilling, they may have different adaptive strategies to this stress. Furthermore, this study delves into the physiological, biochemical and molecular strategies employed by citrus plants to cope with low temperatures.
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Claims 9
Claim · model-written summary
Cold stress decreased gas exchange parameters similarly in both citrus genotypes.
- Material
- both genotypese2
- Treatment
- cold stress at 10/4ºC (day/night) temperaturee1
- Outcome
- gas exchange parameterse2
- Direction
- decreasinge2
- Comparator
- control plants at 25/18 ºCe1
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e1“were subjected to cold stress at 10/4ºC (day/night) temperature, maintaining control plants at 25/18 ºC”
e2“The results exhibited a similar photosynthetic response in both genotypes, decreasing of gas exchange parameters”
Claim · model-written summary
Proline and soluble sugars play a major role in the osmotic response of citrus to chilling.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e3“The study of different osmoprotectants revealed a major role of proline and soluble sugars in the osmotic response of citrus to chilling”
Claim · model-written summary
Genotype CC has a greater capacity to increase proline content than CM.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e4“CC exhibited a greater capacity to increase proline content, while CM maintained higher basal levels of this compound”
Claim · model-written summary
Genotype CM maintains higher basal proline levels.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e4“CC exhibited a greater capacity to increase proline content, while CM maintained higher basal levels of this compound”
Claim · model-written summary
Abscisic acid is more important than other plant hormones in the citrus chilling response.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e5“Phytohormone analysis denoted the importance of abscisic acid (ABA) compared to other plant hormones”
Claim · model-written summary
Genotype CC has a higher capacity to modulate ABA content than CM.
- Material
- CCe6
- Compound
- ABAe6
- Outcome
- capacity to modulate ABA contente6
- Direction
- highere6
- Comparator
- CM onese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e6“CC plants had a higher capacity to modulate ABA content than CM ones”
Claim · model-written summary
Genotype CC shows lower chlorophyll degradation than CM under chilling.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e7“reflected by the lower chlorophyll degradation and lower oxidative stress (marked as malondialdehyde content) of CC compared to CM”
Claim · model-written summary
Genotype CC shows lower oxidative stress (malondialdehyde content) than CM under chilling.
- Material
- CCe7
- Outcome
- oxidative stress (marked as malondialdehyde content)e7
- Direction
- lowere7
- Comparator
- CMe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e7“reflected by the lower chlorophyll degradation and lower oxidative stress (marked as malondialdehyde content) of CC compared to CM”
Claim · model-written summary
Both citrus genotypes show a moderate tolerance to chilling.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants of two citrus genotypes, Carrizo citrange (CC) and Cleopatra mandarin (CM)”
e3“both genotypes exhibit a moderate tolerance to chilling”
The same questions in other papers
cold · physiology: gas exchange · CitrusResults agree
1 paper in the same direction as this paper
- 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.