Abstract
A split-plot experiment arranged in a randomized complete blocks design with three replications was carried out in Safiabad Agricultural Research Center of Dezful in order to investigate the effects of foliar applications of ascorbic acid (AsA), salicylic acid (SA) and methanol (Me), under deficit irrigation conditions, in canola; there were 3 levels of irrigation as the main factor (irrigation after 70 mm evaporation from the pan as control, cessation of irrigation at the flowering stage and cessation of irrigation at the appearance of siliques) and 10 levels of foliar applications as sub-factor (100, 200 and 300 mg.l-1AsA; 100, 200 and 300 µM SA; 10, 20 and 30% (w/v) methanol; and foliar application of distilled water as control). Foliar applications were made during both budding and initiation of flowering stages. Results indicated that antioxidant enzymes showed different responses to deficit irrigation and foliar application treatments. Maximum catalase (CAT) and polyphenol oxidase (PPO) activities were observed under cessation of irrigation at flowering stage and foliar application of 300 µM SA, while ascorbate peroxidase (APX) reached its maximum activity under the same irrigation conditions and foliar application of 300 mg.l-1AsA. SA had more influence to increase in CAT and PPO activity under cessation of irrigation at flowering stage. The relative water content (RWC) was also decreased due to the drought stress caused by the cessation of irrigation. Foliar application of SA (100 μM) and Me (10% w/v) had more influence to maintain RWC compared to ascorbic acid under irrigation cessation at flowering stage.
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Claims 7
Claim · model-written summary
Catalase activity was maximal with irrigation cessation at flowering and 300 µM SA.
- Taxon
- Canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- cessation of irrigation at flowering stage and foliar application of 300 µM SAe0
- Outcome
- catalase (CAT)e0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Maximum catalase (CAT) and polyphenol oxidase (PPO) activities were observed under cessation of irrigation at flowering stage and foliar application of 300 µM SA”
t0“Canola”
Claim · model-written summary
Polyphenol oxidase activity was maximal with irrigation cessation at flowering and 300 µM SA.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- cessation of irrigation at flowering stage and foliar application of 300 µM SAe0
- Outcome
- polyphenol oxidase (PPO)e0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum catalase (CAT) and polyphenol oxidase (PPO) activities were observed under cessation of irrigation at flowering stage and foliar application of 300 µM SA”
t0“Canola”
Claim · model-written summary
Ascorbate peroxidase activity was maximal with irrigation cessation at flowering and 300 mg.l-1AsA.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- foliar application of 300 mg.l-1AsAe0
- Outcome
- ascorbate peroxidase (APX)e0
- Direction
- maximume0
- Qualifier
- cessation of irrigation at flowering stagee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ascorbate peroxidase (APX) reached its maximum activity under the same irrigation conditions and foliar application of 300 mg.l-1AsA”
t0“Canola”
e1“activities were observed under cessation of irrigation at flowering stage and foliar application of 300 µM SA”
Claim · model-written summary
SA increased CAT and PPO activity under irrigation cessation at flowering.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- SAe0
- Outcome
- CAT and PPO activitye0
- Direction
- increasee0
- Qualifier
- cessation of irrigation at flowering stagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA had more influence to increase in CAT and PPO activity under cessation of irrigation at flowering stage”
t0“Canola”
Claim · model-written summary
Cessation of irrigation reduced canola relative water content.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- cessation of irrigatione0
- Outcome
- relative water content (RWC)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative water content (RWC) was also decreased due to the drought stress caused by the cessation of irrigation”
t0“Canola”
Claim · model-written summary
Foliar SA at 100 μM maintained relative water content more than ascorbic acid under irrigation cessation at flowering.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- SA (100 μM)e0
- Outcome
- RWCe0
- Direction
- more influence to maintaine0
- Qualifier
- irrigation cessation at flowering stagee0
- Comparator
- ascorbic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of SA (100 μM) and Me (10% w/v) had more influence to maintain RWC compared to ascorbic acid under irrigation cessation at flowering stage”
t0“Canola”
Claim · model-written summary
Foliar Me at 10% w/v maintained relative water content more than ascorbic acid under irrigation cessation at flowering.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- Me (10% w/v)e0
- Outcome
- RWCe0
- Direction
- more influence to maintaine0
- Qualifier
- irrigation cessation at flowering stagee0
- Comparator
- ascorbic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of SA (100 μM) and Me (10% w/v) had more influence to maintain RWC compared to ascorbic acid under irrigation cessation at flowering stage”
t0“Canola”
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