Salinity is one of the major abiotic factors that limit the growth and productivity of plants.Foliar application of plant growth regulators(PGRs)may help plants ameliorate the negative impacts of salinity.Thus,a field...Salinity is one of the major abiotic factors that limit the growth and productivity of plants.Foliar application of plant growth regulators(PGRs)may help plants ameliorate the negative impacts of salinity.Thus,a field experiment was conducted at the Botanical Garden University of Balochistan,Quetta,to explore the potential role of PGRs,i.e.,moringa leaf extract(MLE;10%),proline(PRO;1μM),salicylic acid(SA;250μM),and thiourea(TU;10 mM)in ameliorating the impacts of salinity(120 mM)on Plantago ovata,an important medicinal plant.Salinity hampered plant photosynthetic pigments and metabolites but elevated oxidative parameters.However,foliar application of PGRs enhanced photosynthetic pigments,including Chl b(21.11%),carotenoids(57.87%)except Chl a,activated the defense mechanisms by restoring and enhancing the metabolites,i.e.,soluble sugars(49.68%),soluble phenolics(33.34%),and proline(31.47%),significantly under salinity stress.Furthermore,foliar supplementation of PGRs under salt stress led to a decrease of about 43.02%and 43.27%in hydrogen peroxide and malondialdehyde content,respectively.Thus,PGRs can be recommended for improved photosynthetic efficiency and metabolite content that can help to get better yield under salt stress,with the best and most effective treatments being those of PRO and MLE to predominately ameliorate the harsh impacts of salinity.展开更多
Jujube is an underutilized fruit having high maturity variation at harvest.Investigations were made on eight different cultivars of jujube(Umran,Karela,Gurrh,Amrodia,Mehmood Wali,Aakash,Foladi and Khubani)for changes ...Jujube is an underutilized fruit having high maturity variation at harvest.Investigations were made on eight different cultivars of jujube(Umran,Karela,Gurrh,Amrodia,Mehmood Wali,Aakash,Foladi and Khubani)for changes in antioxidative enzymatic activities,phytochemical functions and proximate composition with respect to different harvest maturity stages(M_(1):mature green,M_(2):yellow and M_(3):crispy brown)under postharvest ambient conditions(25±2℃;60%-65%RH)at three shelf intervals(1,3 and 5 d).Significant genotypic and maturity related variation was recorded regarding studied attributes.The fruit of cv.ʽKhubaniʼhad better attributes among the cultivars evaluated.The crispy brown jujube fruit had higher peroxidase(POD)and catalase(CAT)activity and more protein,total soluble solids(TSS),ash,crude fat and fiber than early mature stages.Over time,the ascorbic acid(vitamin C),titratable acidity(TA),total phenolic(TPC),total antioxidant capacity(TAC),crude protein,crude fiber,moisture,crude fat and activity of antioxidative enzymes[CAT and superoxide dismutase(SOD)]exhibited a significant decline;while increase was recorded in TSS,pH and POD activity.Overall,this work identified that jujube’s antioxidative,biochemical and proximate properties are significantly influenced by cultivar,fruit harvest maturity and duration of postharvest handling under ambient shelf.展开更多
基金supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia,Grant No.451–03–68/2022–124/200032.
文摘Salinity is one of the major abiotic factors that limit the growth and productivity of plants.Foliar application of plant growth regulators(PGRs)may help plants ameliorate the negative impacts of salinity.Thus,a field experiment was conducted at the Botanical Garden University of Balochistan,Quetta,to explore the potential role of PGRs,i.e.,moringa leaf extract(MLE;10%),proline(PRO;1μM),salicylic acid(SA;250μM),and thiourea(TU;10 mM)in ameliorating the impacts of salinity(120 mM)on Plantago ovata,an important medicinal plant.Salinity hampered plant photosynthetic pigments and metabolites but elevated oxidative parameters.However,foliar application of PGRs enhanced photosynthetic pigments,including Chl b(21.11%),carotenoids(57.87%)except Chl a,activated the defense mechanisms by restoring and enhancing the metabolites,i.e.,soluble sugars(49.68%),soluble phenolics(33.34%),and proline(31.47%),significantly under salinity stress.Furthermore,foliar supplementation of PGRs under salt stress led to a decrease of about 43.02%and 43.27%in hydrogen peroxide and malondialdehyde content,respectively.Thus,PGRs can be recommended for improved photosynthetic efficiency and metabolite content that can help to get better yield under salt stress,with the best and most effective treatments being those of PRO and MLE to predominately ameliorate the harsh impacts of salinity.
基金Supporting Project number(RSPD2024R561),King Saud University,Riyadh,Saudi Arabia.
文摘Jujube is an underutilized fruit having high maturity variation at harvest.Investigations were made on eight different cultivars of jujube(Umran,Karela,Gurrh,Amrodia,Mehmood Wali,Aakash,Foladi and Khubani)for changes in antioxidative enzymatic activities,phytochemical functions and proximate composition with respect to different harvest maturity stages(M_(1):mature green,M_(2):yellow and M_(3):crispy brown)under postharvest ambient conditions(25±2℃;60%-65%RH)at three shelf intervals(1,3 and 5 d).Significant genotypic and maturity related variation was recorded regarding studied attributes.The fruit of cv.ʽKhubaniʼhad better attributes among the cultivars evaluated.The crispy brown jujube fruit had higher peroxidase(POD)and catalase(CAT)activity and more protein,total soluble solids(TSS),ash,crude fat and fiber than early mature stages.Over time,the ascorbic acid(vitamin C),titratable acidity(TA),total phenolic(TPC),total antioxidant capacity(TAC),crude protein,crude fiber,moisture,crude fat and activity of antioxidative enzymes[CAT and superoxide dismutase(SOD)]exhibited a significant decline;while increase was recorded in TSS,pH and POD activity.Overall,this work identified that jujube’s antioxidative,biochemical and proximate properties are significantly influenced by cultivar,fruit harvest maturity and duration of postharvest handling under ambient shelf.
