Abstract
Guava is a fruit tree with high potential in the semi-arid region of northeast Brazil. However, qualitative and quantitative water scarcity is a limiting factor for the expansion of irrigated agriculture. Thus, it is necessary to use techniques to mitigate the effects of salt stress, such as foliar application of proline. The objective of this study was to evaluate the effect of foliar application of proline as a mitigator of salt stress effects on the morphophysiology of guava cv. Paluma. The experiment was carried out under field conditions at the ‘Rolando Enrique Rivas Castellón’ Experimental Farm in São Domingos, PB, Brazil, using a randomized block design in a 5 × 4 factorial scheme referring to five levels of electrical conductivity of irrigation water, ECw (0.8, 1.5, 2.2, 2.9, and 3.5 dS m−1) and four concentrations of proline (0, 8, 16, and 24 mM). Salinity above 0.8 dS m−1 compromised gas exchange, photosynthetic pigment synthesis, photochemical efficiency, and growth of guava plants at 360 days after transplanting. Foliar application of proline at a concentration of 24 mM mitigated the effect of salt stress on the relative water content, stomatal conductance, and carotenoid contents in plants irrigated with 3.6 dS m−1 water. Meanwhile, a proline concentration of up to 18 mM resulted in higher transpiration, CO2 assimilation rate, instantaneous carboxylation efficiency, and absolute growth rate in stem diameter under ECw of 0.8 dS m−1. Proline concentration of up to 24 mM increased the biosynthesis of photosynthetic pigments and the relative growth rate in stem diameter of guava in the period from 190 to 360 days after transplanting.
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Claims 5
Claim · model-written summary
Irrigation salinity above 0.8 dS m−1 compromised gas exchange, pigment synthesis, photochemical efficiency, and growth of guava at 360 days after transplanting.
- Taxon
- guava
Psidium guajavae0 - Treatment
- Salinity above 0.8 dS m−1e0
- Outcome
- gas exchange, photosynthetic pigment synthesis, photochemical efficiency, and growthe0
- Direction
- compromisede0
- Qualifier
- 360 days after transplantinge0
- Comparator
- 0.8 dS m−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity above 0.8 dS m−1 compromised gas exchange, photosynthetic pigment synthesis, photochemical efficiency, and growth of guava plants at 360 days after transplanting.”
Claim · model-written summary
Foliar proline at 24 mM mitigated salt effects on relative water content, stomatal conductance, and carotenoid contents under 3.6 dS m−1 irrigation.
- Taxon
- guavaPsidium guajavat0
- Treatment
- Foliar application of proline at a concentration of 24 mMe0
- Outcome
- relative water content, stomatal conductance, and carotenoid contentse0
- Direction
- mitigatede0
- Qualifier
- 3.6 dS m−1 watere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of proline at a concentration of 24 mM mitigated the effect of salt stress on the relative water content, stomatal conductance, and carotenoid contents in plants irrigated with 3.6 dS m−1 water.”
t0“Guava”
Claim · model-written summary
Up to 18 mM proline produced higher transpiration, CO2 assimilation rate, and instantaneous carboxylation efficiency at ECw 0.8 dS m−1.
- Taxon
- GuavaPsidium guajavat0
- Treatment
- a proline concentration of up to 18 mMe0
- Outcome
- transpiration, CO2 assimilation rate, instantaneous carboxylation efficiencye0
- Direction
- highere0
- Qualifier
- ECw of 0.8 dS m−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a proline concentration of up to 18 mM resulted in higher transpiration, CO2 assimilation rate, instantaneous carboxylation efficiency, and absolute growth rate in stem diameter under ECw of 0.8 dS m−1.”
t0“Guava”
Claim · model-written summary
Up to 18 mM proline produced higher absolute growth rate in stem diameter at ECw 0.8 dS m−1.
- Taxon
- GuavaPsidium guajavat0
- Treatment
- a proline concentration of up to 18 mMe0
- Outcome
- absolute growth rate in stem diametere0
- Direction
- highere0
- Qualifier
- ECw of 0.8 dS m−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a proline concentration of up to 18 mM resulted in higher transpiration, CO2 assimilation rate, instantaneous carboxylation efficiency, and absolute growth rate in stem diameter under ECw of 0.8 dS m−1.”
t0“Guava”
Claim · model-written summary
Up to 24 mM proline increased photosynthetic pigment biosynthesis and relative stem diameter growth from 190 to 360 days after transplanting.
- Taxon
- guavaPsidium guajavae0
- Treatment
- Proline concentration of up to 24 mMe0
- Outcome
- biosynthesis of photosynthetic pigments and the relative growth rate in stem diametere0
- Direction
- increasede0
- Qualifier
- 190 to 360 days after transplantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline concentration of up to 24 mM increased the biosynthesis of photosynthetic pigments and the relative growth rate in stem diameter of guava in the period from 190 to 360 days after transplanting.”
The same questions in other papers
application · physiology: gas exchange · Psidium guajava (guava)Results agree
1 paper in the same direction as this paper
- positive
salinity · physiology: photosynthesis · Psidium guajava (guava)Results agree
7 papers in the same direction as this paper
- negative
- negative
- negative
4 papers more in this group
See all 8 papers →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.