Abstract
The latest research has shown that chitosan acts as a growth stimulator and elicitor in plants, including resistance to biotic and abiotic factors. However, increasing concentrations could possibly make chitosan a source of stress for plants. In this study, we investigated the effect of low-molecular-weight chitosan hydrolysate on the root development of tomato (Solanum lycoperscum) cultivars Red Cherry, Lel, and Tytan. The growth rate change, together with total phenolic content, phenylalanine ammonia-lyase (PAL) activity, and gene expression, were studied in relation to tomatoes. High concentrations of chitosan negatively affect the growth of tomato seedlings and contribute to changes in the tropism of the seedling roots. After the addition of chitosan hydrolysate, the PAL activity and the total phenolic content decreased 24 h later. PAL is a key enzyme in the biosynthesis of many plant stress factors. An analysis of the tomato PAL gene family was carried out. The SlPAL gene expression in the seedlings of cv. Cherry increased 1.5 times after 48 h, while in cv. Lel, the expression stably decreased in the presence of chitosan. The obtained results are supposed to aid our understanding of the mechanisms underlying the effects of chitosan on plant development and further its successful application in agriculture as well as in research on plant stress.
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Claims 6
Claim · model-written summary
High chitosan concentrations impaired tomato seedling growth.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- High concentrations of chitosane0
- Outcome
- growth of tomato seedlingse0
- Direction
- negatively affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High concentrations of chitosan negatively affect the growth of tomato seedlings”
Claim · model-written summary
High chitosan concentrations changed tomato root tropism.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- High concentrations of chitosane0
- Outcome
- tropism of the seedling rootse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High concentrations of chitosan negatively affect the growth of tomato seedlings and contribute to changes in the tropism of the seedling roots.”
Claim · model-written summary
Chitosan hydrolysate lowered PAL activity after 24 hours.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- chitosan hydrolysatee0
- Gene
- PALe0
- Outcome
- PAL activitye0
- Direction
- decreasede0
- Qualifier
- 24 h latere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the addition of chitosan hydrolysate, the PAL activity and the total phenolic content decreased 24 h later.”
t0“Tomato”
Claim · model-written summary
Chitosan hydrolysate lowered total phenolic content after 24 hours.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- chitosan hydrolysatee0
- Outcome
- total phenolic contente0
- Direction
- decreasede0
- Qualifier
- 24 h latere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the addition of chitosan hydrolysate, the PAL activity and the total phenolic content decreased 24 h later.”
t0“Tomato”
Claim · model-written summary
SlPAL expression rose 1.5 times in Cherry seedlings after 48 hours.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- cv. Cherrye0
- Treatment
- chitosant1
- Gene
- SlPALe0
- Outcome
- SlPAL gene expressione0
- Direction
- increasede0
- Value
- 1.5 timese0
- Qualifier
- 48 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SlPAL gene expression in the seedlings of cv. Cherry increased 1.5 times after 48 h”
t0“Tomato”
t1“chitosan”
Claim · model-written summary
SlPAL expression decreased in Lel seedlings under chitosan.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- cv. Lele0
- Treatment
- chitosane0
- Gene
- SlPALt1
- Outcome
- expressione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cv. Lel, the expression stably decreased in the presence of chitosan”
t0“Tomato”
t1“SlPAL gene expression”
The same questions in other papers
chitosan · growth · Solanum lycopersicum (tomato)Results differ
2 papers in the same direction as this paper · 39 in the opposite direction
- positive
- positive
- negative
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