Abstract
Rice is a crop that presents sensitivity to cold, especially in the germination phase, which leads to high economic losses. Alternative management forms are essential to increase tolerance to low temperatures, and seed priming represents a promising tool. The objective of this study was to investigate the priming effect of the aqueous extract of carrot roots on rice seeds to increase tolerance to low temperatures during germination. Seeds from cultivars BRS Querência (cold-susceptible) and Brilhante (cold-tolerant) were soaked for 24 h in concentrations of 0, 25, 50, and 100% carrot extract, sown on germitest paper and conditioned in BOD for 21 days at 15 °C. As a control, the seeds soaked in water were also germinated at 25 °C. They were evaluated for germination, first germination count, and germination speed index to calculate the stress indices: tolerance index, susceptibility index, and harmonic mean. They were also evaluated for the length and dry mass of shoot and root. The results showed that the rice seeds conditioning in carrot extract effectively reduces the damage caused by cold, significantly increasing the germination speed and the percentage of final germination and the growth evaluations, more expressive at 100% concentration. The stress indexes are efficient in estimating the tolerance of the cultivars and the effect of the different conditions in low-temperature conditions, highlighting the superiority of the Brilhante cultivar.
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Claims 5
Claim · model-written summary
Conditioning rice seeds in carrot extract significantly increased germination speed and final germination percentage under cold.
- Taxon
- Rice
Oryza sativae0 - Treatment
- carrot extracte3
- Outcome
- germination speed and the percentage of final germinatione2
- Direction
- increasinge2
- Comparator
- the seeds soaked in watere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice is a crop that presents sensitivity to cold”
e1“the seeds soaked in water were also germinated at 25 °C”
e2“significantly increasing the germination speed and the percentage of final germination”
e3“conditioning in carrot extract effectively reduces the damage caused by cold”
Claim · model-written summary
Conditioning rice seeds in carrot extract reduced the damage caused by cold.
- Taxon
- RiceOryza sativae0
- Treatment
- carrot extracte3
- Outcome
- the damage caused by colde3
- Direction
- reducese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice is a crop that presents sensitivity to cold”
e3“conditioning in carrot extract effectively reduces the damage caused by cold”
Claim · model-written summary
Growth evaluations of rice seedlings increased with carrot extract conditioning, more expressively at 100% concentration.
- Taxon
- RiceOryza sativae0
- Treatment
- 100% concentratione5
- Outcome
- growth evaluationse4
- Direction
- increasinge4
- Qualifier
- more expressive at 100% concentratione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice is a crop that presents sensitivity to cold”
e4“significantly increasing the germination speed and the percentage of final germination and the growth evaluations”
e5“more expressive at 100% concentration”
Claim · model-written summary
The stress indexes estimated the cold tolerance of the rice cultivars efficiently.
- Taxon
- RiceOryza sativae0
- Outcome
- tolerance of the cultivarse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice is a crop that presents sensitivity to cold”
e6“The stress indexes are efficient in estimating the tolerance of the cultivars and the effect of the different conditions in low-temperature conditions, highlighting the superiority of the Brilhante cultivar”
Claim · model-written summary
The Brilhante cultivar showed superior cold tolerance compared with BRS Querência.
- Taxon
- RiceOryza sativae0
- Material
- Brilhantee6
- Outcome
- tolerance of the cultivarse6
- Direction
- superioritye6
- Comparator
- BRS Querênciae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice is a crop that presents sensitivity to cold”
e6“The stress indexes are efficient in estimating the tolerance of the cultivars and the effect of the different conditions in low-temperature conditions, highlighting the superiority of the Brilhante cultivar”
e7“Seeds from cultivars BRS Querência (cold-susceptible) and Brilhante (cold-tolerant)”
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