An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on v...An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on various seedling parameters. There is no significant influence on dry matter production with the diazotrophs, Azospirillum and Azotobacter. However, the vital seedling parameters such as germination percentage and vigour index were improved. Azotobacter treatment influenced maximum of 50% germination, whereas Azospirillum and Azotobacter were on par with C. roseus with respect to their vigour index. There was significant difference in the population of total diazotrophs. Azospirillum and Azotobacter between rhizosphere and non-rhizosphere soils of C. roseus had the same trend and were observed at various locations of the study. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) were increased to a significant extent due to the treatment with diazotrophs.展开更多
The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage ...The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage under （30±2） ℃ in the dark, was studied. TDM at 20 mg/L was given to tubers by dipping the tubers in treatment solution containing 20 mg/L TDM on 10, 25 and 40 d after storage （DAS）. Starch, sugars, protein, amino acid contents as well as protease and a-amylase activities were estimated on 15, 30 and 45 DAS from two physiological regions viz., apical and basal regions of the tubers. In normal conditions （control） sprouting occurred on 70 to 80 DAS. The starch content decreased, while protein, amino acid, sugar contents and protease and a-amylase activities were increased due to TDM treatment and led to early sprouting.展开更多
A field experiment was conducted to investigate the effect of growth regulators on growth characteristics such as root length,shoot length,total leaf area,number of inflorescence per plant,number of flower per inflore...A field experiment was conducted to investigate the effect of growth regulators on growth characteristics such as root length,shoot length,total leaf area,number of inflorescence per plant,number of flower per inflorescence,whole plant fresh weight and whole plant dry weight.Photosynthetic characteristics were also analyzed based on the same experiment.For this,various photosynthetic pigment contents such as chlorophyll,carotenoid,anthocyanin and xanthophyll content were calculated.The conventional growth regulator abscisic acid(ABA)and non-conventional growth regulator triazole compound paclobutrazol(PBZ)were used.Root length increased due to growth regulator treatment,but shoot length decreased.Leaf area was decreased due to growth regulator treatment.The number of inflorescence increased in ABA treated plants,but it was decreased in PBZ treated plants.In ABA treated plants,the number of flowers per inflorescence was increased.In PBZ treated plants the number of inflorescence was reduced.The whole plant fresh weight(FW)and dry weight(DW)were increased in ABA and PBZ treated plants.There was an increase in chlorophyll content in growth regulator treated plants compared to control,and it was more in PBZ treated plants.The carotenoid content was also increased in ABA and PBZ treated plants.展开更多
A study dealing with the marine fungi associated with decaying wood samples in the brackish water mangrove ecosystem and shoreline ecosystem was carried out in south India.A total of 19 marine fungi were isolated from...A study dealing with the marine fungi associated with decaying wood samples in the brackish water mangrove ecosystem and shoreline ecosystem was carried out in south India.A total of 19 marine fungi were isolated from the brackish water mangrove ecosystem.They included 13 Ascomycetes,one Basidiomycete and five Mitosporic fungi.In terms of percent frequency of occurrence,the most frequent species obtained from the brackishwater were the Lignincola longirostris(16.60%)and Savoryella lignicola(12.09%).Nine species were found frequently.Five species were occasionally encoun-tered.Aigialus mangrovei,Aniptodera mangrovei and Halosarpheia marina were the rare species recorded.The average number of isolates per wood sample was 1.53.A total of 27 marine fungi including 15 ascomycetes,one basidiomycete and ten mitosporic fungi were recorded from the shoreline ecosystem.In terms of percent frequency of occurrence,the most frequent species obtained from Kanyakumari were the Arenariomyces trifurcates(13.66%),Corollospora maritima(12.44%),and Cirrenalia pygmea(10.98%).Seven species were found frequently.Fourteen species were occasionally encountered.Three species were found to be rare in occurrence.The average number of isolates per wood sample was 1.21.展开更多
In this study,5μmol·L^(-1)abscisic acid(ABA)and gibberellic acid(GA3)were used to study the effect of both growth regulators on the morphological parameters and pigment composition of Andrographis paniculata.The...In this study,5μmol·L^(-1)abscisic acid(ABA)and gibberellic acid(GA3)were used to study the effect of both growth regulators on the morphological parameters and pigment composition of Andrographis paniculata.The growth regulators were applied by means of foliar spray during morning hours.ABA treatment inhibited the growth of the stem and internodal length when compared with control,whereas GA3 treatment increased the plant height and internodal length.The total number of leaves per plant decreased in the ABA-treated plants,but GA3 treatment increased the total number of leaves when compared with the control.Both growth regulators(ABA and GA3)showed increased leaf area.ABA and GA3 treatments slightly decreased the total root growth at all the stages of growth.The growth regulator treatments increased the whole plant fresh and dry weight at all stages of growth.ABA enhanced the fresh and dry weight to a larger extent when compared with GA3.An increase in the total chlorophyll content was recorded in ABA and GA3 treatments.The chlorophyll-a,chlorophyll-b,and carotenoids were increased by ABA and GA3 treatments when compared with the control plants.The xanthophylls and anthocyanin content were increased with ABA and GA3 treatments in A.paniculata plants.展开更多
Changes in the sucrose metabolism of Cur-cuma longa L.plants were studied under treatment with different triazole compounds viz.,triadimefon(TDM)and propiconazole(PCZ).Plants were treated with TDM at 15mg/L and PCZ at...Changes in the sucrose metabolism of Cur-cuma longa L.plants were studied under treatment with different triazole compounds viz.,triadimefon(TDM)and propiconazole(PCZ).Plants were treated with TDM at 15mg/L and PCZ at 10mg/L separately by soil drenching on 80,110,and 140 days after planting(DAP).The plants were harvested randomly on 90,120,and 150DAP to determine the effect of both the triazoles on sucrose metabolizing enzymes and phenol content.The sucrose metabolism was studied by analyzing sucrose metaboliz-ing enzymes like sucrose synthase and sucrose phosphate synthase.All the analyses were assayed in leaves and tubers of both control and treated plants.It was found that both of the triazole compounds had profound effects on these parameters.展开更多
文摘An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on various seedling parameters. There is no significant influence on dry matter production with the diazotrophs, Azospirillum and Azotobacter. However, the vital seedling parameters such as germination percentage and vigour index were improved. Azotobacter treatment influenced maximum of 50% germination, whereas Azospirillum and Azotobacter were on par with C. roseus with respect to their vigour index. There was significant difference in the population of total diazotrophs. Azospirillum and Azotobacter between rhizosphere and non-rhizosphere soils of C. roseus had the same trend and were observed at various locations of the study. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) were increased to a significant extent due to the treatment with diazotrophs.
文摘The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage under （30±2） ℃ in the dark, was studied. TDM at 20 mg/L was given to tubers by dipping the tubers in treatment solution containing 20 mg/L TDM on 10, 25 and 40 d after storage （DAS）. Starch, sugars, protein, amino acid contents as well as protease and a-amylase activities were estimated on 15, 30 and 45 DAS from two physiological regions viz., apical and basal regions of the tubers. In normal conditions （control） sprouting occurred on 70 to 80 DAS. The starch content decreased, while protein, amino acid, sugar contents and protease and a-amylase activities were increased due to TDM treatment and led to early sprouting.
文摘A field experiment was conducted to investigate the effect of growth regulators on growth characteristics such as root length,shoot length,total leaf area,number of inflorescence per plant,number of flower per inflorescence,whole plant fresh weight and whole plant dry weight.Photosynthetic characteristics were also analyzed based on the same experiment.For this,various photosynthetic pigment contents such as chlorophyll,carotenoid,anthocyanin and xanthophyll content were calculated.The conventional growth regulator abscisic acid(ABA)and non-conventional growth regulator triazole compound paclobutrazol(PBZ)were used.Root length increased due to growth regulator treatment,but shoot length decreased.Leaf area was decreased due to growth regulator treatment.The number of inflorescence increased in ABA treated plants,but it was decreased in PBZ treated plants.In ABA treated plants,the number of flowers per inflorescence was increased.In PBZ treated plants the number of inflorescence was reduced.The whole plant fresh weight(FW)and dry weight(DW)were increased in ABA and PBZ treated plants.There was an increase in chlorophyll content in growth regulator treated plants compared to control,and it was more in PBZ treated plants.The carotenoid content was also increased in ABA and PBZ treated plants.
文摘A study dealing with the marine fungi associated with decaying wood samples in the brackish water mangrove ecosystem and shoreline ecosystem was carried out in south India.A total of 19 marine fungi were isolated from the brackish water mangrove ecosystem.They included 13 Ascomycetes,one Basidiomycete and five Mitosporic fungi.In terms of percent frequency of occurrence,the most frequent species obtained from the brackishwater were the Lignincola longirostris(16.60%)and Savoryella lignicola(12.09%).Nine species were found frequently.Five species were occasionally encoun-tered.Aigialus mangrovei,Aniptodera mangrovei and Halosarpheia marina were the rare species recorded.The average number of isolates per wood sample was 1.53.A total of 27 marine fungi including 15 ascomycetes,one basidiomycete and ten mitosporic fungi were recorded from the shoreline ecosystem.In terms of percent frequency of occurrence,the most frequent species obtained from Kanyakumari were the Arenariomyces trifurcates(13.66%),Corollospora maritima(12.44%),and Cirrenalia pygmea(10.98%).Seven species were found frequently.Fourteen species were occasionally encountered.Three species were found to be rare in occurrence.The average number of isolates per wood sample was 1.21.
文摘In this study,5μmol·L^(-1)abscisic acid(ABA)and gibberellic acid(GA3)were used to study the effect of both growth regulators on the morphological parameters and pigment composition of Andrographis paniculata.The growth regulators were applied by means of foliar spray during morning hours.ABA treatment inhibited the growth of the stem and internodal length when compared with control,whereas GA3 treatment increased the plant height and internodal length.The total number of leaves per plant decreased in the ABA-treated plants,but GA3 treatment increased the total number of leaves when compared with the control.Both growth regulators(ABA and GA3)showed increased leaf area.ABA and GA3 treatments slightly decreased the total root growth at all the stages of growth.The growth regulator treatments increased the whole plant fresh and dry weight at all stages of growth.ABA enhanced the fresh and dry weight to a larger extent when compared with GA3.An increase in the total chlorophyll content was recorded in ABA and GA3 treatments.The chlorophyll-a,chlorophyll-b,and carotenoids were increased by ABA and GA3 treatments when compared with the control plants.The xanthophylls and anthocyanin content were increased with ABA and GA3 treatments in A.paniculata plants.
文摘Changes in the sucrose metabolism of Cur-cuma longa L.plants were studied under treatment with different triazole compounds viz.,triadimefon(TDM)and propiconazole(PCZ).Plants were treated with TDM at 15mg/L and PCZ at 10mg/L separately by soil drenching on 80,110,and 140 days after planting(DAP).The plants were harvested randomly on 90,120,and 150DAP to determine the effect of both the triazoles on sucrose metabolizing enzymes and phenol content.The sucrose metabolism was studied by analyzing sucrose metaboliz-ing enzymes like sucrose synthase and sucrose phosphate synthase.All the analyses were assayed in leaves and tubers of both control and treated plants.It was found that both of the triazole compounds had profound effects on these parameters.
