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Screening and Assessment of Selected Chilli (Capsicum annuum L.) Genotypes for Drought Tolerance at Seedling Stage

Phyton-International Journal of Experimental Botany 2021年第5期90卷 1425-1443页

作者： md.Rezwan Molla md.motiar rohman Mahmuda Binte Monsur Mirza Hasanuzzaman Lutful Hassan Plant Genetic Resources Centre Bangladesh Agricultural Research InstituteGazipur1701Bangladesh Molecular Breeding Laboratory Plant Breeding DivisionBangladesh Agricultural Research InstituteGazipur1701Bangladesh Department of Agronomy Faculty of AgricultureSher-e-Bangla Agricultural UniversityDhaka1207Bangladesh Department of Genetics and Plant Breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh

This study was undertaken to investigate oxidative stress tolerant mechanisms in chilli(Capsicum annuum L.)under drought genotypes through evaluating morphological,physiological,biochemical and stomatal *** genotypes were evaluated for their genetic potential to drought stress tolerant at seedling *** days old seedlings were exposed to drought stress induced by stop watering for the following 10 days and rewatering for the following one week as *** on their survival performance,two tolerant genotypes ***-10906 and BD-109012 and two susceptible genotypes ***-10902 and RT-20 were selected for studying the oxidative stress tolerance *** reduced root and shoot length,dry weight,ratio,petiole weight and leaf area in both tolerant and susceptible genotypes,and a higher reduction was observed in susceptible *** reduction of leaf area and photosynthetic pigments were also found in tolerant ***,tolerant genotypes showed higher recovery than susceptible genotypes after the removal of stress.A higher reduction of relative water content(RWC)may cause an imbalance between absorbed and transpirated water in susceptible *** accumulation of proline in tolerant genotypes might be helpful to for better osmotic maintenance than that in susceptible *** genotypes showed higher antioxidant activity as they showed DPPH radical scavenging percentage than the susceptible ***,closer stomata in tolerant genotypes than susceptible ones helped to avoid dehydration in tolerant ***,the above morphological,physiological,biochemical and stomatal parameters helped to show better tolerance in chilli under drought stress.

关键词： Chilli drought stress tolerance morphology physiology biochemical altern

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Salt-Induced Changes in Physio-Biochemical and Antioxidant Defense System in Mustard Genotypes

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 541-559页

作者： md.Shakhawat Hossain md.Daud Hossain Abdul Hannan Mirza Hasanuzzaman md.motiar rohman Central Laboratory Research WingBangladesh Agricultural Research InstituteGazipur 1701Bangladesh Seed Technology Division Bangladesh Agricultural Research InstituteGazipur 1701Bangladesh Department of Agronomy Sher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh Molecular Breeding Lab Plant Breeding DivisionBangladesh Agricultural Research InstituteGazipur 1701Bangladesh

Salinity stress is a major factor limiting plant growth and productivity of many crops including *** present study investigated the identification of salt tolerant mustard genotypes and better understanding the mechanism of salinity *** stresses significantly reduced relative water content(RWC),chlorophyll(Chl)content,K^(+) and K^(+)/Na^(+) ratio,photosynthetic rate(P N),tran-spiration rate(Tr),stomatal conductance(gs),intercellular CO_(2) concentration(Ci)and increased the levels of proline(Pro)and lipid peroxidation(mdA)contents,Na+,superoxide(O_(2)^(•−))and hydrogen peroxide(H_(2)O_(2))in both tolerant and sensitive mustard *** tolerant genotypes maintained higher Pro and lower mdA content than the salt sensitive genotypes under stress *** activities of superoxide dismutase(SOD),catalase(CAT),peroxidase(POD),glutathione peroxidase(GPX),monodehydroascorbate reductase(mdHAR)and dehydroascorbate reductase(DHAR)were increased with increasing salinity in salt tolerant genotypes,BJ-1603,BARI Sarisha-11 and BARI Sarisha-16,but the activities were unchanged in salt sensitive genotype,BARI ***,the increment of ascorbate peroxidase(APX)activity was higher in salt sensitive genotype as compared to tolerant ***,the activ-ities of glutathione reductase(GR)and glutathione S-transferase(GST)were increased sharply at stress conditions in tolerant genotypes as compared to sensi-tive *** accumulation of Pro along with improved physiological and biochemical parameters as well as reduced oxidative damage by up-regulation of antioxidant defense system are the mechanisms of salt tolerance in selected mustard genotypes,BJ-1603 and BARI Sarisha-16.

关键词： Mustard saline sensitivity photosynthesis antioxidants ionic imbalance oxidative stress

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Insight into 5-aminolevulinic acid-induced modulation of cellular antioxidant metabolism to confer salinity and drought tolerance in maize

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BIOCELL 2020年第4期44卷 713-730页

作者： md.ROBYUL ISLAM TAHIA NAZNIN DIPALI RANI GUPTA md.ASHRAFUL HAQUE MIRZA HASANUZZAMAN md.motiar rohman Institute of Biotechnology and Genetic Engineering(IBGE) Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Genetics and Plant Breeding Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Agronomy Faculty of AgricultureSher-e-Bangla Agricultural UniversitySher-e-Bangla NagarDhaka1207Bangladesh Molecular Breeding Laboratory Plant Breeding DivisionBangladesh Agricultural Research InstituteGazipur1701Bangladesh

The current study investigated the comparative oxidative damage in twomaize seedlings induced by saline,drought,and combined stress and the ameliorative role of two different doses(20 and 80μM)of 5-aminolevulinic acid(ALA)against the above-mentioned *** grown 10-day-old maize(Zea mays,*** Hybrid Maize-7(BHM-7)and BARI Hybrid Maize-9(BHM-9))seedlings were exposed to 12 dS/m of saline solution,200 mM mannitol-induced drought stress alone and their combined stress for 7 *** revealed that individual stresses retard the plant growth to some degrees,however,their combined stress has more detrimental effects,which might be correlated with lipid peroxidation(mdA)-induced oxidative stress in seedlings,enhanced Na+/K+ratio,and augmented generation of superoxide(O_(2)•^(−))and hydrogen peroxide(H_(2)O_(2)).In contrast,exogenous ALA supplementation at 20μM concentration markedly recovered from chlorosis and growth inhibition,substantially scavenged reactive oxygen species(ROS)and mdA by preserving ionhomeostasis and relaxing oxidative stress,also,by boosting catalase(CAT)and glutathione S-transferase(GST),and exclusively via depressing the activity of lipoxygenase(LOX)antioxidant *** the contrary,80μM ALA made things worse,nevertheless,higher activities shown by other antioxidant enzymes,like,superoxide dismutase(SOD),ascorbate peroxidase(APX),peroxidase(POD),and glutathione peroxidase(GPX),which were related to lessen the oxidative damage by highly produced O_(2)•^(−)and H_(2)O_(2) under combined ***-denaturing gel electrophoresis was done for further ***,ALA importantly increased the photosynthetic pigment contents in both genotypes irrespective of ***,GST might have assisted the plants to escape from the herbicidal effect by ***,in the combined stress condition,high ALA concentration may have some positive role to *** findings also showed that BHM-9 performed better than BHM

关键词： Maize Combined stress Salinity Drought 5-aminolevulinic acid Oxidative stress

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Salicylic Acid Application Mitigates Oxidative Damage and Improves the Growth Performance of Barley under Drought Stress

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Phyton-International Journal of Experimental Botany 2023年第5期92卷 1513-1537页

作者： Shah Mohammad Naimul Islam Niloy Paul md.Mezanur Rahman md.Ashraful Haque md.motiar rohman Mohammad Golam Mostofa Institute of Biotechnology and Genetic Engineering Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Institute of Genomics for Crop Abiotic Stress Tolerance Department of Plant and Soil ScienceTexas Tech UniversityLubbock79409USA Plant Breeding Division Bangladesh Agricultural Research InstituteGazipur1701Bangladesh Department of Energy Plant Research Laboratory Michigan State UniversityEast Lansing48824USA

Drought is a severe environmental constraint,causing a significant reduction in crop productivity across the *** acid(SA)is an important plant growth regulator that helps plants cope with the adverse effects induced by various abiotic *** current study investigated the potential effects of SA on drought tolerance efficacy in two barley(Hordeum vulgare)genotypes,namely BARI barley 5 and BARI barley ***-day-old barley seedlings were exposed to drought stress by maintaining 7.5%soil moisture content in the absence or presence of 0.5,1.0 and 1.5 mM *** exposure led to severe damage to both genotypes,as indicated by phenotypic aberrations and reduction of dry *** the other hand,the application of SA to drought-stressed plants protected both barley genotypes from the adverse effects of drought,which was reflected in the improvement of phenotypes and biomass *** supplementation improved relative water content and proline levels in drought-stressed barley genotypes,indicating the osmotic adjustment functions of SA under water-deficit *** stress induced the accumulation of reactive oxygen species(ROS),such as hydrogen peroxide(H2O2)and superoxide(O_(2)•^(−)),and the lipid peroxidation product malondialdehyde(mdA)in the leaves of barley *** supply of SA reduced oxidative damage by restricting the accumulation of ROS through the stimulation of the activities of key antioxidant enzymes,including superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),ascorbate peroxidase(APX)and glutathione peroxidase(GPX).Among the three-applied concentrations of SA,0.5 mM SA exhibited better mitigating effects against drought stress considering the phenotypic performance and biochemical ***,BARI barley 5 showed better performance under drought stress than BARI barley 7 in the presence of SA ***,our results suggest that SA played a crucial role in improving water status and antioxidant

关键词： Antioxidant defense barley drought stress plant growth reactive oxygen species salicylic acid

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Oxidative Stress Tolerance Mechanism in Rice under Salinity

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 497-517页

作者： Mahmuda Binte Monsur Nasrin Akter Ivy M.Moynul Haque Mirza Hasanuzzaman Ayman EL Sabagh md.motiar rohman Department of Genetics and Plant Breeding Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Agronomy Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafrelsheikh33516Egypt Department of Field Crops Faculty of AgricultureSiirt UniversitySiirt56100Turkey Molecular Breeding Lab Plant Breeding DivisionBangladesh Agricultural Research InstituteGazipur1701Bangladesh

The research was conducted to investigate comparative oxidative damage including probable protective roles of antioxidant and glyoxalase systems in rice(Oryza sativa L.)seedlings under salinity *** of two rice genotypes:Pokkali(tolerant)and BRRI dhan28(sensitive)were subjected to 8 dSm^(−1) salinity stress for seven days in a hydroponic *** observed significant variation between Pokkali and BRRI dhan28 in phenotypic,biochemical and mole-cular level under salinity *** content,ion homeostasis,antioxidant enzymes,ascorbate and glutathione redox system and proline accumulation may help Pokkali to develop defense system during salinity ***,the activity antioxidant enzymes particularly superoxide dismutase(SOD),catalase(CAT)and non-chloroplastic peroxidase(POD)were observed significantly higher in Pokkali compared to salt-sensitive BRRI *** glyoxalase(Gly-I)and glyoxalase(Gly-II)activity might have also accompanied Pokkali genotype to reduce potential cytotoxic MG through non-toxic hydroxy acids ***,the efficient antioxidants and glyoxalase system together increased adaptability in Pokkali during salinity stress.

关键词： Reactive oxygen species(ROS) antioxidants glyoxalase system salinity oxidative stress

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Genetic Variability and Path Analysis Studies in Hybrid Maize (<i>Zea mays</i>L.)

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American Journal of Plant Sciences 2017年第12期8卷 3101-3109页

作者： Mohammad Quamrul Islam Matin md. Shalim Uddin md. motiar rohman Mohammad Amiruzzaman Abul Kalam Azad Bhagya Rani Banik Bangladesh Agricultural Research Institute (BARI) Gazipur Bangladesh Bangladesh Agricultural Research Council (BARC) Dhaka Bangladesh

The present study was carried out to access correlation coefficient, path analysis and genetic variability among twenty one locally developed maize hybrids for ten characters. Positive and significant genotypic, phenotypic correlation coefficient were recorded for yield with anthesis silking interval (rg = 1.00**, rp = 0.96**), cob diameter (rg = 0.99** and rp = 0.95**) and ear height (rg = 0.98** and rp = 0.94**). But days to 50% tasseling had moderate but significant positive correlation at both phenotypic and genotypic level. High genotypic coefficient of variation (GCV) was obtained from thousand seed weight, days to 50% silking, cob diameter and anthesis silking interval. The highest phenotypic coefficient of variation (PCV) was observed in thousand seed weight followed by days to 50% silking and cob diameter. The highest heritability (Hb) was observed for cob diameter (95.25) followed by days to 50% silking (94.15), days to maturity (93.85) and ear height (93.06). The characters with high GCV and higher values of heritability indicated high potential for selection. Anthesis silking interval (0.79) had the highest positive direct effect on yield followed by cob diameter (0.31), cob length (0.31) and plant height (0.04) indicating the effectiveness of direct selection. While some other characters such as days to 50% tasseling (-0.12), days to 50% silking (-1.78), ear height (-1.16), days to maturity (-0.64) exhibited indirect negative effect on yield indicating the effectiveness of indirect selection.

关键词： Genetic Variability Path Co-Efficient Hybrid Maize

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