Abstract
To examine polyamines (PAs) effect in modulating the drought induced by polyethylene glycol (PEG) in maize (Zea mays L.) seedlings (variety Khoibhutta, 8 day seedlings grown in petri dish in incubator) were subjected to 20% PEG (polyethylene glycol) followed by 20 µmol PAs, Putrescine (Put), Spermidine (Spd) and Spermine (Spm) with PEG solution for 48 hours. Sharp decrease in Relative Water Content (RWC), Chl a, Chl b, carotenoid (Car) and total pigment content was observed under drought compared to control condition, while PAs application reversed their decreasing trends. PEG significantly increased Reactive Oxidative Species (ROS) [superoxide (O2•−) and H2O2], Methyl Glyoxal (MG), Melondialdehyde (MDA) and Lipoxigenase (LOX) activity, while Pas decreased the contents considerably (except MG) as compared to those under drought. Drought increased proline content, which was further augmented in PA treatments. PAs failed to incline glyoxalase‘s (Gly-I and Gly-II) activities, reduced under PEG. The activity and western blot confirmed the accumulation of Glutathione S-Transferase (GST) under drought, but PAs failed to augment the activity. Ascorbic Acid (AsA) and Glutathione (GSH) got oxidized into Dehydroascorbate (DHA) and oxidized Glutathione (GSSG) under drought but PAs effectively maintained homeostasis. Superoxide Dismutase (SOD), Peroxidase (POD), Ascorbate Peroxidase (APX), Glutathione Peroxidase (GPX), Monodehydroascorbatereductase (MDHAR), Dehydroascorbatereductase (DHAR), and Glutathione Reductase (GR) inclined in drought stressed seedlings, while Catalase (CAT) activity decreased under drought. PAs addition increased SOD, POD, GPX, CAT, MDHAR, and GR activities, but declined DHAR activity. These findings suggested important role of PAs in increasing tolerance under short term drought by modulating antioxidant effect.
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Claims 8
Claim · model-written summary
Polyamine treatment reversed the drought-induced decrease in total pigment content in maize seedlings.
- Treatment
- PAs applicatione1
- Outcome
- total pigment contente1
- Direction
- reversede1
- Comparator
- control conditione1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e1“Sharp decrease in Relative Water Content (RWC), Chl a, Chl b, carotenoid (Car) and total pigment content was observed under drought compared to control condition, while PAs application reversed their decreasing trends”
Claim · model-written summary
Polyamine treatment decreased reactive oxygen species under drought in maize seedlings.
- Treatment
- Pase2
- Outcome
- Reactive Oxidative Species (ROS)e3
- Direction
- decreasede2
- Comparator
- those under droughte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e3“PEG significantly increased Reactive Oxidative Species (ROS)”
e2“while Pas decreased the contents considerably (except MG) as compared to those under drought”
Claim · model-written summary
Drought increased proline content, and polyamine treatment further augmented it in maize seedlings.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e4“Drought increased proline content, which was further augmented in PA treatments”
Claim · model-written summary
Polyamine addition increased SOD, POD and GPX activities in drought-stressed maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e5“PAs addition increased SOD, POD, GPX, CAT, MDHAR, and GR activities, but declined DHAR activity”
Claim · model-written summary
Polyamine addition increased CAT, MDHAR and GR activities in drought-stressed maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e5“PAs addition increased SOD, POD, GPX, CAT, MDHAR, and GR activities, but declined DHAR activity”
Claim · model-written summary
Polyamine addition declined DHAR activity in drought-stressed maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e5“PAs addition increased SOD, POD, GPX, CAT, MDHAR, and GR activities, but declined DHAR activity”
Claim · model-written summary
Catalase activity decreased under drought in maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e6“while Catalase (CAT) activity decreased under drought”
Claim · model-written summary
Drought sharply decreased relative water content and pigment content in maize seedlings relative to control.
- Treatment
- under droughte1
- Outcome
- Relative Water Content (RWC)e1
- Direction
- Sharp decreasee1
- Comparator
- control conditione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought in Maize (Zea mays L.)”
e1“Sharp decrease in Relative Water Content (RWC), Chl a, Chl b, carotenoid (Car) and total pigment content was observed under drought compared to control condition, while PAs application reversed their decreasing trends”
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