Abstract
Heat stress caused due to increasing warming climate has become a severe threat to global food production including rice. Silicon plays a major role in improving growth and productivity of rice by aiding in alleviating heat stress in rice. Soil silicon is only sparingly available to the crops can be made available by silicate solubilizing and plant-growth-promoting bacteria that possess the capacity to solubilize insoluble silicates can increase the availability of soluble silicates in the soil. In addition, plant growth promoting bacteria are known to enhance the tolerance to abiotic stresses of plants, by affecting the biochemical and physiological characteristics of plants. The present study is intended to understand the role of beneficial bacteria viz. Rhizobium sp. IIRR N1 a silicate solublizer and Gluconacetobacter diazotrophicus , a plant growth promoting bacteria and their interaction with insoluble silicate sources on morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system. Joint inoculation of silicates and both the bacteria increased silicon content in rice tissue, root and shoot biomass, significantly increased the antioxidant enzyme activities (viz. superoxidase dismutase, catalase and ascorbate peroxidase) compared to other treatments with sole application of either silicon or bacteria. The physiological traits (viz. chlorophyll content, relative water content) were also found to be significantly enhanced in presence of silicates and both the bacteria after exposure to heat stress conditions. Expression profiling of shoot and root tissues of rice seedlings revealed that seedlings grown in the presence of silicates and both the bacteria exhibited higher expression of heat shock proteins (HSPs viz., OsHsp90 , OsHsp100 and 60 kDa chaperonin ), hormone-related genes ( OsIAA6 ) and silicon transporters ( OsLsi1 and OsLsi2 ) as compared to seedlings treated with either silicates or with the bacteria alone. The results thus reveal the interactive effect of combined application of silicates along with bacteria Rhizobium sp. IIRR N1, G. diazotrophicus inoculation not only led to augmented silicon uptake by rice seedlings but also influenced the plant biomass and elicited higher expression of HSPs, hormone-related and silicon transporter genes leading to improved tolerance of seedling to heat stress.
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Claims 6
Claim · model-written summary
Joint inoculation of silicates and both bacteria increased silicon content in rice tissue
- Taxon
- rice
Oryza sativae0 - Treatment
- Joint inoculation of silicates and both the bacteriae1
- Interactor
- Rhizobium sp. IIRR N1e2symbiont
- Second interactor
- Gluconacetobacter diazotrophicusGluconacetobacter diazotrophicuse4symbiont
- Outcome
- silicon content in rice tissuee1
- Direction
- increasede1
- Comparator
- sole application of either silicon or bacteriae3
- Setting
- controlled hydroponic systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e1“Joint inoculation of silicates and both the bacteria increased silicon content in rice tissue, root and shoot biomass”
e3“compared to other treatments with sole application of either silicon or bacteria”
e2“Rhizobium sp. IIRR N1 a silicate solublizer”
e4“Gluconacetobacter diazotrophicus , a plant growth promoting bacteria”
Claim · model-written summary
Joint inoculation of silicates and both bacteria increased root and shoot biomass of rice seedlings
- Taxon
- riceOryza sativae0
- Treatment
- Joint inoculation of silicates and both the bacteriae1
- Interactor
- Rhizobium sp. IIRR N1e2symbiont
- Second interactor
- Gluconacetobacter diazotrophicusGluconacetobacter diazotrophicuse4symbiont
- Outcome
- root and shoot biomasse1
- Direction
- increasede1
- Comparator
- sole application of either silicon or bacteriae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e1“Joint inoculation of silicates and both the bacteria increased silicon content in rice tissue, root and shoot biomass”
e3“compared to other treatments with sole application of either silicon or bacteria”
e2“Rhizobium sp. IIRR N1 a silicate solublizer”
e4“Gluconacetobacter diazotrophicus , a plant growth promoting bacteria”
Claim · model-written summary
Joint inoculation significantly increased the antioxidant enzyme activities superoxide dismutase, catalase and ascorbate peroxidase
- Taxon
- riceOryza sativae0
- Treatment
- Joint inoculation of silicates and both the bacteriae1
- Interactor
- Rhizobium sp. IIRR N1e4symbiont
- Second interactor
- Gluconacetobacter diazotrophicusGluconacetobacter diazotrophicuse5symbiont
- Outcome
- antioxidant enzyme activitiese2
- Direction
- increasede2
- Qualifier
- superoxidase dismutase, catalase and ascorbate peroxidasee2
- Comparator
- sole application of either silicon or bacteriae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e1“Joint inoculation of silicates and both the bacteria increased silicon content in rice tissue, root and shoot biomass”
e2“significantly increased the antioxidant enzyme activities (viz. superoxidase dismutase, catalase and ascorbate peroxidase)”
e3“compared to other treatments with sole application of either silicon or bacteria”
e4“Rhizobium sp. IIRR N1 a silicate solublizer”
e5“Gluconacetobacter diazotrophicus , a plant growth promoting bacteria”
Claim · model-written summary
Silicates with both bacteria enhanced chlorophyll content and relative water content of rice under heat stress
- Taxon
- riceOryza sativae0
- Treatment
- in presence of silicates and both the bacteriae4
- Outcome
- chlorophyll content, relative water contente4
- Direction
- enhancede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e4“The physiological traits (viz. chlorophyll content, relative water content) were also found to be significantly enhanced in presence of silicates and both the bacteria after exposure to heat stress conditions”
Claim · model-written summary
Seedlings grown with silicates and both bacteria showed higher expression of heat shock protein genes
- Taxon
- riceOryza sativae0
- Treatment
- in the presence of silicates and both the bacteriae5
- Gene
- OsHsp90e5
- Outcome
- expression of heat shock proteinse5
- Direction
- highere5
- Qualifier
- OsHsp100 and 60 kDa chaperonine6
- Comparator
- seedlings treated with either silicates or with the bacteria alonee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e5“seedlings grown in the presence of silicates and both the bacteria exhibited higher expression of heat shock proteins (HSPs viz., OsHsp90”
e6“OsHsp100 and 60 kDa chaperonin”
e7“as compared to seedlings treated with either silicates or with the bacteria alone”
Claim · model-written summary
Seedlings grown with silicates and both bacteria showed higher expression of hormone-related and silicon transporter genes
- Taxon
- riceOryza sativae0
- Treatment
- in the presence of silicates and both the bacteriae5
- Gene
- OsIAA6e7
- Outcome
- hormone-related genese7
- Direction
- highere5
- Comparator
- seedlings treated with either silicates or with the bacteria alonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morpho-physiological and molecular attributes of rice ( Oryza sativa L.) seedlings after exposure to heat stress in a controlled hydroponic system”
e5“seedlings grown in the presence of silicates and both the bacteria exhibited higher expression of heat shock proteins (HSPs viz., OsHsp90”
e7“hormone-related genes ( OsIAA6 ) and silicon transporters ( OsLsi1 and OsLsi2 ) as compared to seedlings treated with either silicates or with the bacteria alone”
e6“as compared to seedlings treated with either silicates or with the bacteria alone”
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