Abstract
Brown seaweed extracts are commercially used as agricultural biostimulants, and the green macroalgae Ulva spp. has shown promise for that purpose. We evaluated the ideal dosage of U. lactuca ulvan and flour on seed germination invigoration and the effects of U. flexuosa and U. lactuca extracts on tomato seedling growth (Solanun lycopersicum). The germination recovery of aged seeds after the application of U. lactuca was evaluated by seed germination rates and seedling emergence. Greenhouse cultivated seedlings were irrigated with 0.2 and 0.4 g×L-1 of the flour, or an ulvan solution of Ulva spp. Seedling growth parameters (height, stem diameter, height/stem diameter ratio, biomass, and number of leaves) were compared with the control (seedlings irrigated with distilled water). All dosages of U. lactuca ulvan and flour were found to increase the germination rates of aged seeds as compared to controls. No significant difference in seedling emergence rates were seen. After treatment with Ulva spp. extracts no significant differences in seedling growth were detected. We concluded that low doses of the U. lactuca extract will increase the germination rates of S. lycopersicum seeds and, while different dosages of the extracts of two Ulva’s species did not stimulate tomato seedling growth, they were also not lethal.
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Claims 4
Claim · model-written summary
Ulva lactuca ulvan and flour increased germination rates of aged tomato seeds compared with controls.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- aged seedse1
- Treatment
- U. lactuca ulvan and floure1
- Outcome
- germination ratese1
- Direction
- increasee1
- Comparator
- controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“All dosages of U. lactuca ulvan and flour were found to increase the germination rates of aged seeds as compared to controls”
t0“tomato germination”
Claim · model-written summary
Ulva extracts did not significantly change tomato seedling emergence rates.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- U. lactucae3
- Outcome
- seedling emergence ratese2
- Direction
- No significant differencee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“No significant difference in seedling emergence rates were seen”
e3“The germination recovery of aged seeds after the application of U. lactuca was evaluated by seed germination rates and seedling emergence”
t0“tomato germination”
Claim · model-written summary
Ulva spp. extracts did not significantly change tomato seedling growth compared with the control.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Ulva spp. extractse4
- Outcome
- seedling growthe4
- Direction
- no significant differencese4
- Comparator
- control (seedlings irrigated with distilled water)e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“After treatment with Ulva spp. extracts no significant differences in seedling growth were detected”
e5“compared with the control (seedlings irrigated with distilled water)”
t0“tomato germination”
Claim · model-written summary
Different dosages of the extracts of two Ulva species were not lethal to tomato seedlings.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- different dosages of the extracts of two Ulva’s speciese6
- Outcome
- lethale6
- Direction
- not lethale6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“different dosages of the extracts of two Ulva’s species did not stimulate tomato seedling growth, they were also not lethal”
t0“tomato germination”
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