Abstract
Soil salinity is a major environmental constraint affecting avocado (Persea americana Mill.) productivity. In this study, we evaluate the physio-morphological and molecular responses of two avocado varieties, drymifolia (sensitive) and americana (tolerant), subjected to increasing NaCl concentrations for 60 days. Our results reveal distinct adaptive strategies. While salinity reduced total biomass in both genotypes, var. americana exhibited superior resilience, characterized by preferential biomass allocation to the root system. Ion analysis demonstrated that tolerance was not mediated by K+ homeostasis, but rather by the differential management of toxic ions. var. americana effectively sequestered chloride Cl− in the roots, whereas var. drymifolia exhibited a breakdown of the exclusion mechanism at 60 mM NaCl, with shoot Cl− concentrations exceeding those of the root, leading to severe toxicity. At the molecular level, qPCR analysis of the Na+ transporters PaHKT1 and PaSOS1 showed no expression pattern correlated with salt stress. Bioinformatic assessment revealed significant structural divergences and a lack of conserved functional domains in these proteins. These findings challenge the applicability of the classical sodium-exclusion model (typical of Liliopsida and Magnoliopsida) to avocado. We conclude that salt tolerance in this Lauraceae species is primarily driven by root-mediated Cl− exclusion rather than canonical Na+ transport pathways.
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Claims 9
Claim · model-written summary
Salinity reduced total biomass in both avocado varieties.
- Taxon
- avocado
Persea americanat0 - Treatment
- salinitye0
- Outcome
- total biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity reduced total biomass in both genotypes”
t0“Avocado”
Claim · model-written summary
Variety americana allocated more biomass to roots under salinity.
- Taxon
- avocadoPersea americanat0
- Material
- var. americanae0
- Outcome
- biomass allocation to the root systeme0
- Direction
- preferentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“var. americana exhibited superior resilience, characterized by preferential biomass allocation to the root system.”
t0“Avocado”
Claim · model-written summary
Potassium homeostasis did not mediate salt tolerance.
- Taxon
- avocadoPersea americanat0
- Compound
- K+e0
- Outcome
- tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerance was not mediated by K+ homeostasis, but rather by the differential management of toxic ions.”
t0“Avocado”
Claim · model-written summary
Variety americana sequestered chloride in roots.
- Taxon
- avocadoPersea americanat0
- Material
- var. americanae0
- Organ / stage
- rootse0
- Outcome
- chloride Cl− in the rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“var. americana effectively sequestered chloride Cl− in the roots”
t0“Avocado”
Claim · model-written summary
At 60 mM NaCl, drymifolia shoots exceeded roots in chloride concentration with severe toxicity.
- Taxon
- avocadoPersea americanat0
- Material
- var. drymifoliae0
- Treatment
- 60 mM NaCle0
- Outcome
- shoot Cl− concentrationse0
- Direction
- exceedinge0
- Comparator
- roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“var. drymifolia exhibited a breakdown of the exclusion mechanism at 60 mM NaCl, with shoot Cl− concentrations exceeding those of the root, leading to severe toxicity.”
t0“Avocado”
Claim · model-written summary
PaHKT1 expression had no pattern correlated with salt stress.
- Taxon
- avocadoPersea americanat0
- Treatment
- salt stresse0
- Gene
- PaHKT1e0
- Outcome
- expression patterne0
- Direction
- no expression pattern correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“qPCR analysis of the Na+ transporters PaHKT1 and PaSOS1 showed no expression pattern correlated with salt stress.”
t0“Avocado”
Claim · model-written summary
PaSOS1 expression had no pattern correlated with salt stress.
- Taxon
- avocadoPersea americanat0
- Treatment
- salt stresse0
- Gene
- PaSOS1e0
- Outcome
- expression patterne0
- Direction
- no expression pattern correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“qPCR analysis of the Na+ transporters PaHKT1 and PaSOS1 showed no expression pattern correlated with salt stress.”
t0“Avocado”
Claim · model-written summary
The transporter proteins had structural divergences and lacked conserved functional domains.
- Taxon
- avocadoPersea americanat0
- Outcome
- structural divergences and a lack of conserved functional domainse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bioinformatic assessment revealed significant structural divergences and a lack of conserved functional domains in these proteins.”
t0“Avocado”
Claim · model-written summary
Authors conclude avocado salt tolerance is driven chiefly by root chloride exclusion.
- Taxon
- avocadoPersea americanat0
- Outcome
- salt tolerancee0
- Qualifier
- root-mediated Cl− exclusione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt tolerance in this Lauraceae species is primarily driven by root-mediated Cl− exclusion rather than canonical Na+ transport pathways.”
t0“Avocado”
The same questions in other papers
salinity · growth · Persea americana (avocado)Results agree
3 papers in the same direction as this paper
- negative
- negative
- no effect
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.