Abstract
Priming is used to increase vigor, germination synchronization, seedling growth and field establishment by advancing metabolic processes within seeds. Seed respiration is a good indicator of the metabolic processes that lead to transition towards germination. Onion seeds (cv.Pusa Ridhi) subjected to osmopriming (-1.5 MPa PEG6000 for 7 days), magnetopriming (100 mT for 30 min) and halopriming (150 mM KNO3 for 6 days), were evaluated at different times of imbibition to study the emergence index and respiration indices such as infrared thermal fingerprint, CO2 evolution rate, cytochrome c oxidase activity and soluble sugars profile. Haloprimed seeds exhibited 42.5% higher emergence index as compared to unprimed control. Primed and unprimed seeds showed negative values for relative temperature (∆T) (difference in temperature of seed and its immediate environment). Haloprimed seeds had the lowest values (-4.1 to -2.3ºC) compared to other priming treatments over the germination period. Soluble sugars like raffinose, sucrose, glucose and fructose contents were monitored and it was observed that en masse raffinose, glucose and fructose levels were (17.5-59.9%) lower in haloprimed seeds over control. A positive correlation (r2=0.504**) was derived between the amount of these sugars and ∆T. Seed respiration, measured as CO2 evolution rate was more for haloprimed seeds that indicated that these soluble sugars were used as respiratory substrates. Significantly higher cytochrome c oxidase activity (40.7-89.8 and 12.5-66.6%) was observed in all primed seeds at 28 and 36 h, respectively. Among the various seed priming methods, halopriming proved to be the most effective priming treatment in onion seeds as evidenced by the higher respiration indices that resulted in faster metabolic rate and emergence index.
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Claims 8
Claim · model-written summary
Halopriming raised onion seed emergence index by 42.5% relative to unprimed control.
- Taxon
- Onion
Allium cepat0 - Organ / stage
- seedse0
- Treatment
- Haloprimede0
- Outcome
- emergence indexe0
- Direction
- highere0
- Value
- 42.5%e0
- Comparator
- unprimed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Haloprimed seeds exhibited 42.5% higher emergence index as compared to unprimed control.”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
Primed and unprimed onion seeds had negative relative temperature values.
- Taxon
- OnionAllium cepat0
- Organ / stage
- seedse0
- Outcome
- relative temperature (∆T)e0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Primed and unprimed seeds showed negative values for relative temperature (∆T)”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
Haloprimed onion seeds had the lowest relative temperature, from -4.1 to -2.3ºC.
- Taxon
- OnionAllium cepat0
- Organ / stage
- seedse0
- Treatment
- Haloprimede0
- Outcome
- relative temperature (∆T)e1
- Direction
- loweste0
- Value
- -4.1 to -2.3ºCe0
- Comparator
- other priming treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Haloprimed seeds had the lowest values (-4.1 to -2.3ºC) compared to other priming treatments over the germination period.”
t0“Onion (Allium cepa L.) Seeds”
e1“relative temperature (∆T)”
Claim · model-written summary
Raffinose, glucose and fructose levels were 17.5-59.9% lower in haloprimed onion seeds than controls.
- Taxon
- OnionAllium cepat0
- Organ / stage
- seedse0
- Treatment
- haloprimede0
- Outcome
- raffinose, glucose and fructose levelse0
- Direction
- lowere0
- Value
- 17.5-59.9%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“raffinose, glucose and fructose levels were (17.5-59.9%) lower in haloprimed seeds over control.”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
Soluble sugar amount correlated positively with onion seed relative temperature.
- Taxon
- OnionAllium cepat0
- Compound
- these sugarse0
- Outcome
- ∆Te0
- Direction
- positive correlatione0
- Value
- r2=0.504**e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive correlation (r2=0.504**) was derived between the amount of these sugars and ∆T.”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
Haloprimed onion seeds had higher CO2 evolution rate.
- Taxon
- OnionAllium cepat0
- Treatment
- haloprimede0
- Outcome
- CO2 evolution ratee0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed respiration, measured as CO2 evolution rate was more for haloprimed seeds”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
All primed onion seeds had significantly higher cytochrome c oxidase activity at 28 and 36 h.
- Taxon
- OnionAllium cepat0
- Treatment
- all primede0
- Outcome
- cytochrome c oxidase activitye0
- Direction
- highere0
- Value
- 40.7-89.8 and 12.5-66.6%e0
- Qualifier
- at 28 and 36 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significantly higher cytochrome c oxidase activity (40.7-89.8 and 12.5-66.6%) was observed in all primed seeds at 28 and 36 h, respectively.”
t0“Onion (Allium cepa L.) Seeds”
Claim · model-written summary
The authors judged halopriming the most effective onion seed priming method.
- Taxon
- onionAllium cepae0
- Treatment
- halopriminge0
- Outcome
- most effective priming treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“halopriming proved to be the most effective priming treatment in onion seeds as evidenced by the higher respiration indices that resulted in faster metabolic rate and emergence index.”
t0“Onion (Allium cepa L.) Seeds”
The same questions in other papers
seed treatment · physiology: enzyme activity · Allium cepa (onion)Results agree
1 paper in the same direction as this paper
- positive
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.