Abstract
Using three rice genotypes exhibiting different disease symptoms towards bacterial blight (BB) disease, O. longistaminata (BB-highly resistant), IRBB21 (BB-resistant) and Pusa Basmati 1 (BB-sensitive), we investigated the variable antioxidant profile and oxidative damages resulting from bacterial blight infection to elucidate the antioxidative protective mechanism governing differential BB resistance. Rice genotypes were grown in growth chamber and after 45 days of transplantation in pots, they were inoculated with Xanthomonas oryzae pv. oryzae (Xoo) isolate DX133 following the leaf clipping method. Different biochemical assays were performed with leaf samples collected on 5th day after infection (5th DAI), 10th DAI and 15th DAI. The results showed that O. longistaminata exhibited higher level of total chlorophyll ( 4.42+/-0.09 mg/g fw) and carotenoid ( 2.74+/-0.04 mg/g fw) pigments throughout the studied periods of infection when compared to other genotypes. At 5th DAI, the higher production of non-enzymatic antioxidants including total phenolic content (10.82+/-0.01 mg GAE/g fw) and flavonoid content (18.60+/-0.03 mg QE/G fw) was observed in highly resistant genotype O. longistaminata, compared to Pusa Basmati1 and IRBB21. The activity of catalase (CAT) was increased in all the three genotypes under BB infection. However, O. longistaminata showed highest CAT activity on later stages of infection (15th DAI). The level of total antioxidant and ferric reducing power (FRAP) increased in the infected plants compared to controls on the onset of infection.The present study clearly demonstrates higher level of antioxidative protection in the highly resistant wild genotype O. longistaminata and can significantly contribute to understand the physiological mechanisms in rice conferring BB resistance.
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Claims 8
Claim · model-written summary
O. longistaminata maintained higher total chlorophyll than the other genotypes during infection.
- Taxon
- rice
Oryza sativat0 - Material
- O. longistaminatae0
- Outcome
- total chlorophylle0
- Direction
- highere0
- Value
- 4.42+/-0.09 mg/g fwe0
- Comparator
- other genotypese0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O. longistaminata exhibited higher level of total chlorophyll ( 4.42+/-0.09 mg/g fw) and carotenoid ( 2.74+/-0.04 mg/g fw) pigments throughout the studied periods of infection when compared to other genotypes”
t0“rice”
Claim · model-written summary
O. longistaminata maintained higher carotenoid pigments than other genotypes during infection.
- Taxon
- riceOryza sativat0
- Material
- O. longistaminatae0
- Outcome
- carotenoide0
- Direction
- highere0
- Value
- 2.74+/-0.04 mg/g fwe0
- Comparator
- other genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O. longistaminata exhibited higher level of total chlorophyll ( 4.42+/-0.09 mg/g fw) and carotenoid ( 2.74+/-0.04 mg/g fw) pigments throughout the studied periods of infection when compared to other genotypes”
t0“rice”
Claim · model-written summary
At day five, O. longistaminata had higher total phenolic content than Pusa Basmati1 and IRBB21.
- Taxon
- riceOryza sativat0
- Material
- O. longistaminatae0
- Outcome
- total phenolic contente0
- Direction
- highere0
- Value
- 10.82+/-0.01 mg GAE/g fwe0
- Qualifier
- 5th DAIe0
- Comparator
- Pusa Basmati1 and IRBB21e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 5th DAI, the higher production of non-enzymatic antioxidants including total phenolic content (10.82+/-0.01 mg GAE/g fw) and flavonoid content (18.60+/-0.03 mg QE/G fw) was observed in highly resistant genotype O. longistaminata, compared to Pusa Basmati1 and IRBB21”
t0“rice”
Claim · model-written summary
At day five, O. longistaminata had higher flavonoid content than Pusa Basmati1 and IRBB21.
- Taxon
- riceOryza sativat0
- Material
- O. longistaminatae0
- Outcome
- flavonoid contente0
- Direction
- highere0
- Value
- 18.60+/-0.03 mg QE/G fwe0
- Qualifier
- 5th DAIe0
- Comparator
- Pusa Basmati1 and IRBB21e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 5th DAI, the higher production of non-enzymatic antioxidants including total phenolic content (10.82+/-0.01 mg GAE/g fw) and flavonoid content (18.60+/-0.03 mg QE/G fw) was observed in highly resistant genotype O. longistaminata, compared to Pusa Basmati1 and IRBB21”
t0“rice”
Claim · model-written summary
Catalase activity increased in all three rice genotypes under bacterial blight infection.
- Taxon
- riceOryza sativat0
- Treatment
- BB infectione0
- Gene
- catalase (CAT)e0
- Outcome
- activity of catalase (CAT)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of catalase (CAT) was increased in all the three genotypes under BB infection”
t0“rice”
Claim · model-written summary
O. longistaminata showed the highest catalase activity at day fifteen.
- Taxon
- riceOryza sativat0
- Material
- O. longistaminatae0
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- higheste0
- Qualifier
- 15th DAIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O. longistaminata showed highest CAT activity on later stages of infection (15th DAI)”
t0“rice”
Claim · model-written summary
Infected plants had increased total antioxidant level at the onset of infection versus controls.
- Taxon
- riceOryza sativat0
- Treatment
- infected plantse0
- Outcome
- total antioxidante0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of total antioxidant and ferric reducing power (FRAP) increased in the infected plants compared to controls on the onset of infection”
t0“rice”
Claim · model-written summary
Infected plants had increased ferric reducing power at the onset of infection versus controls.
- Taxon
- riceOryza sativat0
- Treatment
- infected plantse0
- Outcome
- ferric reducing power (FRAP)e0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of total antioxidant and ferric reducing power (FRAP) increased in the infected plants compared to controls on the onset of infection”
t0“rice”
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