The cadmium tolerance capacity of Canna orchioides was evaluated using glasshouse experiment to lay a theoretical foundation to broad applications of this species in cadmium(Cd)polluted areas.The plant growth,Cd absor...The cadmium tolerance capacity of Canna orchioides was evaluated using glasshouse experiment to lay a theoretical foundation to broad applications of this species in cadmium(Cd)polluted areas.The plant growth,Cd absorption,and antioxidative enzyme activities of canna plants treated with different Cd concentrations(0,100,and 200mg·kg^(-1)per dry soil)for 30 days were investigated.The results indicated that the growth of roots,leaves and stems was restricted following Cd addition.The bio-concentration factor was the highest in the roots,followed by the leaves,rhizomes,and stems.Compared with the control,the translocation factor decreased sharply after 100mg·kg^(-1)or 200mg·kg^(-1)Cd treatment,whereas the tolerance index decreased significantly under 200mg·kg^(-1)Cd exposure.The Cd accumulation rate and total Cd accumulation significantly increased under 200mg·kg^(-1)Cd treatment than the control.Themalondialdehyde content remained unchanged at different Cd concentrations,while the relative electrical conductivity of the root increased significantly following 200mg·kg^(-1)Cd treatment.Cd stress increased significantly the activity of superoxide dismutase(SOD),peroxidase(POD),and ascorbate peroxidase(APX)in the leaves,whereas only SOD was raised in the roots.The catalase(CAT)and POD activity in the roots did not differ significantly at different Cd concentrations.Conversely,APX in the roots decreased significantly under Cd stress,which suggests that the protective mechanisms in the leaves differ from those in the roots.These results indicated that C.orchioides has a high tolerance for Cd.Furthermore,the reactive oxygen species caused by Cd stress could be effectively scavenged by the antioxidative system.The present study proved that C.orchioides constitutes a promising ornamental plant for use in the restoration of areas contaminated with Cd.展开更多
Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism o...Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism on TAP degradation is still unknown. The variation in microbial community compositions was investigated by analyzing phospholipid fatty acids （PLFAs） profiles in microbes under TAP exposure. The TAP exposure resulted in an increase in proportions of fatty acid 16：0 and decrease in fatty acid 18：2ω9,12c, indicating that TAP may stimulate the reproduction of microorganisms and inhibit the growth of fungi to some degree. Significant correlation was found between the ratio of fungi to bacteria and TAP removal （r 2 = 0.840, p 0.01）. In addition, the microbial community in the phytoremediation system with C. indica was dominated by Gram negative bacteria, which possibly contributed to the degradation of TAP. These results indicated that TAP might induce the colonization of bacteria in the hydroponic system planted with C. indica, and lead to a discrimination of microbial community, which might be one of the mechanisms on TAP dissipation in phytoremediation system.展开更多
The extraction ofCannaedulisKer. starch from its rhizome was performed using 2 different types of press (hydraulic press and screw press) and with the addition of Na-metabisulphite and NaOH (in the range of concentrat...The extraction ofCannaedulisKer. starch from its rhizome was performed using 2 different types of press (hydraulic press and screw press) and with the addition of Na-metabisulphite and NaOH (in the range of concentration 100 - 5000ppm each). The optimum condition for thisprocess was determined by Central Composite Design of experiment and the statistical calculation was solved by Design-Expert7.0.0. The targets of the observed responses were high starch yield, low ash, low fiber, and high carbohydrate content. The results showed that the starch yield and the reduction of fiber were only influenced by the physical treatment whereas ash content in the product was influenced byboth the NaOH concentration and physical treatment. The carbohydrate content in the extraction product was affected by NaOH, by the interaction between the concentrations of NaOH and Na2S2O5 and also by the physical treatment. The hydraulic press gives much better responses compared to the screw press.But in the selected range of additives concentrations,the screw press gives a higher starch yield(30%-52%).展开更多
In this paper, clear liquid fermentation condition for ethanol production from Canna edulis Kerl with orthogonal design was studied. We have studied five factors that influenced clear liquid fermentation condition for...In this paper, clear liquid fermentation condition for ethanol production from Canna edulis Kerl with orthogonal design was studied. We have studied five factors that influenced clear liquid fermentation condition for ethanol production from Canna edulis Kerl by the single-factor test. The five factors were α-amylase amount, glu-coamylase amount, pH, nitrogen and auxiliary materials amount. Selected the best amounts of α-amylase, glucoamylase, pH, nitrogen source and auxiliary materials by means of the singe- factors test. And then, we used the Orthogonal test to optimize the fermentation process. The study showed that the best fermentation condi-tions were α-amylase amount 7 u/g C.eduli, glu-coamylase amount 145u/g C. edulis, pH 4.4 and the amount of urea 0.08%, 1% of rice bran as auxiliary materials. The rate of alcohol which was produced by the best fermentation conditions is 21.5% that increased by 1.3% than the rate of alcohol by the single-factor test.展开更多
Canna being ornamental plants has a significant role in agriculture, medical, economy and food industry. Canna has a limited vase life due to the rapid loss of moisture from its perianth. For improving its market valu...Canna being ornamental plants has a significant role in agriculture, medical, economy and food industry. Canna has a limited vase life due to the rapid loss of moisture from its perianth. For improving its market value, cuticularisation of the perianth can be achieved by the expression of a heterologous cutin producing gene, using the tissue culture and transformation protocol developed in this study. Efficient, rapid and direct adventitious shoot regeneration was successfully established in Canna × generalis using recalcitrant rhizome explants. The explants were cultured on MS medium supplemented with 6-benzylaminopurine(6-BA), thidiazuron(TDZ), and kinetin. Among the four genotypes taken for tissue culture, the ‘Trinacria variegata' was the best responding cultivar. And 2 mg · L^(-1)6-BA or 1.5 mg · L^(-1) TDZ along with 0.1 mg · L^(-1) IAA was optimum for their regeneration. The highest regeneration was achieved in ‘Trinacria variegata'(36%) on 6-BA, 33% on TDZ while kinetin failed to evoke any regenerative responses. Regeneration was enhanced by supplementation of 100 mg · L^(-1) ascorbic acid(AsA), while, 100 mg · L^(-1) of l-cysteine or 100 mg · L^(-1) dithiothreitol(DTT), inhibited regeneration. Shoots were observed to develop 3–5 fibrous roots on MS medium supplemented with 0.5 mg · L^(-1) indole-3-butyric acid(IBA). The plantlets were transplanted into pots and acclimatised in glasshouse with 100%survival. For transformation of Canna, rhizome explants were co-cultivated for 60 min in Agrobacterium suspension. The explants were washed with 500 mg · L^(-1) cefotaxime solution, subjected to 100 mg · L^(-1) kanamycin selection followed by excision of the shoots and culturing them on IBA-supplemented media for root development. Transgene integration in the putative transformants was confirmed by PCR assay and copy number by Southern blot hybridisation analysis.展开更多
Introduction:Considering the problem of eutrophication of the water bodies,phosphate removal from water has emerged as a research of topical interest.The present study aims to investigate the efficacy of Canna lily-ba...Introduction:Considering the problem of eutrophication of the water bodies,phosphate removal from water has emerged as a research of topical interest.The present study aims to investigate the efficacy of Canna lily-based constructed wetland to remove phosphate from wastewater.The translocation of phosphate in plant tissue and its biochemical transformation in sediments is also studied to understand its accumulation and recirculation within the system.Results:The removal of phosphate stabilized at around 50%in the present study and plant uptake was found to be the major removal mechanism.Average removal was 167 mg/m2 day for total phosphate and 84 mg/m2 day for available phosphate for an initial loading rate of 200 mg/m2 day and 85 mg/m2 day,respectively,at a HRT of 24 h.Most of the phosphate concentrated in above ground tissue of plant and its relative accumulation was maximum in flowers.Fractionation of phosphate in sediments confirmed removal by sediments with an accumulation of apatite phosphate(Ca and Mg bound),but release of non-apatite form(Fe and Al bound).Conclusion:The study concludes that Canna-based constructed wetland can be an effective tool for phosphate removal from wastewater and sediments particularly under tropical conditions.Regular harvesting of above ground tissue of Canna can result in nutrient export from the system,whereas autochthonous addition may result in recirculation.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.31460371)the Natural Science Foundation of Guizhou Province(Grant No.[2014]2061)the Provincial Nation-class Discipline of Biology Foundation(Grant No.GNYL[2017]009FX4KT37).
文摘The cadmium tolerance capacity of Canna orchioides was evaluated using glasshouse experiment to lay a theoretical foundation to broad applications of this species in cadmium(Cd)polluted areas.The plant growth,Cd absorption,and antioxidative enzyme activities of canna plants treated with different Cd concentrations(0,100,and 200mg·kg^(-1)per dry soil)for 30 days were investigated.The results indicated that the growth of roots,leaves and stems was restricted following Cd addition.The bio-concentration factor was the highest in the roots,followed by the leaves,rhizomes,and stems.Compared with the control,the translocation factor decreased sharply after 100mg·kg^(-1)or 200mg·kg^(-1)Cd treatment,whereas the tolerance index decreased significantly under 200mg·kg^(-1)Cd exposure.The Cd accumulation rate and total Cd accumulation significantly increased under 200mg·kg^(-1)Cd treatment than the control.Themalondialdehyde content remained unchanged at different Cd concentrations,while the relative electrical conductivity of the root increased significantly following 200mg·kg^(-1)Cd treatment.Cd stress increased significantly the activity of superoxide dismutase(SOD),peroxidase(POD),and ascorbate peroxidase(APX)in the leaves,whereas only SOD was raised in the roots.The catalase(CAT)and POD activity in the roots did not differ significantly at different Cd concentrations.Conversely,APX in the roots decreased significantly under Cd stress,which suggests that the protective mechanisms in the leaves differ from those in the roots.These results indicated that C.orchioides has a high tolerance for Cd.Furthermore,the reactive oxygen species caused by Cd stress could be effectively scavenged by the antioxidative system.The present study proved that C.orchioides constitutes a promising ornamental plant for use in the restoration of areas contaminated with Cd.
基金supported by the National Natural Sci-ence Fundation of China (No. 20877093)the StateKey Laboratory of Freshwater Ecology and Biotechnology(No. 2008FBZ11)
文摘Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism on TAP degradation is still unknown. The variation in microbial community compositions was investigated by analyzing phospholipid fatty acids （PLFAs） profiles in microbes under TAP exposure. The TAP exposure resulted in an increase in proportions of fatty acid 16：0 and decrease in fatty acid 18：2ω9,12c, indicating that TAP may stimulate the reproduction of microorganisms and inhibit the growth of fungi to some degree. Significant correlation was found between the ratio of fungi to bacteria and TAP removal （r 2 = 0.840, p 0.01）. In addition, the microbial community in the phytoremediation system with C. indica was dominated by Gram negative bacteria, which possibly contributed to the degradation of TAP. These results indicated that TAP might induce the colonization of bacteria in the hydroponic system planted with C. indica, and lead to a discrimination of microbial community, which might be one of the mechanisms on TAP dissipation in phytoremediation system.
文摘The extraction ofCannaedulisKer. starch from its rhizome was performed using 2 different types of press (hydraulic press and screw press) and with the addition of Na-metabisulphite and NaOH (in the range of concentration 100 - 5000ppm each). The optimum condition for thisprocess was determined by Central Composite Design of experiment and the statistical calculation was solved by Design-Expert7.0.0. The targets of the observed responses were high starch yield, low ash, low fiber, and high carbohydrate content. The results showed that the starch yield and the reduction of fiber were only influenced by the physical treatment whereas ash content in the product was influenced byboth the NaOH concentration and physical treatment. The carbohydrate content in the extraction product was affected by NaOH, by the interaction between the concentrations of NaOH and Na2S2O5 and also by the physical treatment. The hydraulic press gives much better responses compared to the screw press.But in the selected range of additives concentrations,the screw press gives a higher starch yield(30%-52%).
文摘In this paper, clear liquid fermentation condition for ethanol production from Canna edulis Kerl with orthogonal design was studied. We have studied five factors that influenced clear liquid fermentation condition for ethanol production from Canna edulis Kerl by the single-factor test. The five factors were α-amylase amount, glu-coamylase amount, pH, nitrogen and auxiliary materials amount. Selected the best amounts of α-amylase, glucoamylase, pH, nitrogen source and auxiliary materials by means of the singe- factors test. And then, we used the Orthogonal test to optimize the fermentation process. The study showed that the best fermentation condi-tions were α-amylase amount 7 u/g C.eduli, glu-coamylase amount 145u/g C. edulis, pH 4.4 and the amount of urea 0.08%, 1% of rice bran as auxiliary materials. The rate of alcohol which was produced by the best fermentation conditions is 21.5% that increased by 1.3% than the rate of alcohol by the single-factor test.
基金Financial support by UGC, New Delhi to RS and by CSIR
文摘Canna being ornamental plants has a significant role in agriculture, medical, economy and food industry. Canna has a limited vase life due to the rapid loss of moisture from its perianth. For improving its market value, cuticularisation of the perianth can be achieved by the expression of a heterologous cutin producing gene, using the tissue culture and transformation protocol developed in this study. Efficient, rapid and direct adventitious shoot regeneration was successfully established in Canna × generalis using recalcitrant rhizome explants. The explants were cultured on MS medium supplemented with 6-benzylaminopurine(6-BA), thidiazuron(TDZ), and kinetin. Among the four genotypes taken for tissue culture, the ‘Trinacria variegata' was the best responding cultivar. And 2 mg · L^(-1)6-BA or 1.5 mg · L^(-1) TDZ along with 0.1 mg · L^(-1) IAA was optimum for their regeneration. The highest regeneration was achieved in ‘Trinacria variegata'(36%) on 6-BA, 33% on TDZ while kinetin failed to evoke any regenerative responses. Regeneration was enhanced by supplementation of 100 mg · L^(-1) ascorbic acid(AsA), while, 100 mg · L^(-1) of l-cysteine or 100 mg · L^(-1) dithiothreitol(DTT), inhibited regeneration. Shoots were observed to develop 3–5 fibrous roots on MS medium supplemented with 0.5 mg · L^(-1) indole-3-butyric acid(IBA). The plantlets were transplanted into pots and acclimatised in glasshouse with 100%survival. For transformation of Canna, rhizome explants were co-cultivated for 60 min in Agrobacterium suspension. The explants were washed with 500 mg · L^(-1) cefotaxime solution, subjected to 100 mg · L^(-1) kanamycin selection followed by excision of the shoots and culturing them on IBA-supplemented media for root development. Transgene integration in the putative transformants was confirmed by PCR assay and copy number by Southern blot hybridisation analysis.
文摘Introduction:Considering the problem of eutrophication of the water bodies,phosphate removal from water has emerged as a research of topical interest.The present study aims to investigate the efficacy of Canna lily-based constructed wetland to remove phosphate from wastewater.The translocation of phosphate in plant tissue and its biochemical transformation in sediments is also studied to understand its accumulation and recirculation within the system.Results:The removal of phosphate stabilized at around 50%in the present study and plant uptake was found to be the major removal mechanism.Average removal was 167 mg/m2 day for total phosphate and 84 mg/m2 day for available phosphate for an initial loading rate of 200 mg/m2 day and 85 mg/m2 day,respectively,at a HRT of 24 h.Most of the phosphate concentrated in above ground tissue of plant and its relative accumulation was maximum in flowers.Fractionation of phosphate in sediments confirmed removal by sediments with an accumulation of apatite phosphate(Ca and Mg bound),but release of non-apatite form(Fe and Al bound).Conclusion:The study concludes that Canna-based constructed wetland can be an effective tool for phosphate removal from wastewater and sediments particularly under tropical conditions.Regular harvesting of above ground tissue of Canna can result in nutrient export from the system,whereas autochthonous addition may result in recirculation.
