Abstract
Rice (Oryza sativa L.) seedlings differing in boron tolerance were grown in hydroponics containing varying boron concentration. (as boric acid) for 8 days. Yoshida Nutrient Solution (Yoshida et al.1976) served as control, whereas 0.5 mM boron (moderately toxic) and 1.5 mM boron (highly toxic). Boron excess (B) caused marked reduction in length, biomass and relative water content of the seedlings, with more reductions in B-sensitive cv. Malaviya-36 as compared with B-tolerant cv. Brown Gora. B-sensitive seedlings showed higher B uptake in roots and shoots compared to the tolerant. Scanning electron microscopy (SEM) revealed ultrastructural damage to the guard cells with excess boron. Energy dispersive X-ray analysis (EDXA) of rice leaves showed decline in concentration of P, S, Ca and Mg in seedlings on B treatment. Increased production of reactive oxygen species O2˙−, H2O2, lipid peroxides, alteration in activity of antioxidative enzymes and increased membrane permeability was observed in B treated seedlings compared to controls. Real time PCR analysis of stress regulatory genes indicated differential expression of SOD isoforms in the two sets of cultivars with B treatment. Interestingly seedlings of B-tolerant cultivar were characterized by higher level of expression of Fe-SOD and its further increased expression on B treatment. Results suggest that B toxicity involves ultrastructural and elemental changes, increased generation of ROS and altered antioxidative enzyme activities in rice seedlings and increased expression Fe-SOD isoform appears to be associated with B tolerance.
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Claims 9
Claim · model-written summary
Boron excess reduced seedling length, biomass and relative water content, more in Malaviya-36 than Brown Gora.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativae0 - Material
- B-sensitive cv. Malaviya-36e1
- Treatment
- Boron excess (B)e1
- Outcome
- length, biomass and relative water contente1
- Direction
- reductione1
- Comparator
- B-tolerant cv. Brown Gorae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“Boron excess (B) caused marked reduction in length, biomass and relative water content of the seedlings, with more reductions in B-sensitive cv. Malaviya-36 as compared with B-tolerant cv. Brown Gora.”
Claim · model-written summary
B-sensitive seedlings took up more boron in roots and shoots than tolerant seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Outcome
- B uptake in roots and shootse1
- Direction
- highere1
- Comparator
- the tolerante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“B-sensitive seedlings showed higher B uptake in roots and shoots compared to the tolerant.”
Claim · model-written summary
Excess boron damaged guard-cell ultrastructure.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- excess borone1
- Outcome
- ultrastructural damage to the guard cellse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“Scanning electron microscopy (SEM) revealed ultrastructural damage to the guard cells with excess boron.”
Claim · model-written summary
Boron treatment lowered leaf P, S, Ca and Mg concentrations.
- Taxon
- riceOryza sativae1
- Treatment
- B treatmente1
- Outcome
- concentration of P, S, Ca and Mge1
- Direction
- declinee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“Energy dispersive X-ray analysis (EDXA) of rice leaves showed decline in concentration of P, S, Ca and Mg in seedlings on B treatment.”
Claim · model-written summary
Boron treatment increased reactive oxygen species and lipid peroxides compared with controls.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- B treatede1
- Outcome
- reactive oxygen species O2˙−, H2O2, lipid peroxidese1
- Direction
- Increasede1
- Comparator
- controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“Increased production of reactive oxygen species O2˙−, H2O2, lipid peroxides, alteration in activity of antioxidative enzymes and increased membrane permeability was observed in B treated seedlings compared to controls.”
Claim · model-written summary
Boron treatment altered antioxidative enzyme activity compared with controls.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- B treatede1
- Outcome
- activity of antioxidative enzymese1
- Comparator
- controlse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“alteration in activity of antioxidative enzymes and increased membrane permeability was observed in B treated seedlings compared to controls.”
Claim · model-written summary
Boron treatment increased membrane permeability compared with controls.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- B treatede1
- Outcome
- membrane permeabilitye1
- Direction
- increasede1
- Comparator
- controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“increased membrane permeability was observed in B treated seedlings compared to controls.”
Claim · model-written summary
Boron treatment produced differential SOD isoform expression in the cultivars.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- B treatmente1
- Gene
- SOD isoformse1
- Outcome
- differential expression of SOD isoformse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“Real time PCR analysis of stress regulatory genes indicated differential expression of SOD isoforms in the two sets of cultivars with B treatment.”
Claim · model-written summary
The tolerant cultivar had higher Fe-SOD expression, which increased further on boron treatment.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- B treatmente1
- Gene
- Fe-SODe1
- Outcome
- expression of Fe-SODe1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings”
e1“seedlings of B-tolerant cultivar were characterized by higher level of expression of Fe-SOD and its further increased expression on B treatment.”
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2 papers more in this group
See all 6 papers →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.