5-Aminolevulinic acid alleviates herbicide-induced physiological and ultrastructural changes in Brassica napus     

Ling XU  Faisal Islam  Wen-fang ZHANG  Muhammad A Ghani  Basharat Ali 《农业科学学报》2018,17(3):579-592

It is well known that application of 5-aminolevulinic acid(ALA) could promote the plant growth under abiotic stress in oilseed rape(Brassica napus L.). However, the specifics of its physiological and ultrastructural regulation under herbicide stress conditions are poorly understood. In the present study, alleviating role of ALA in B. napus was investigated under four levels of herbicide propyl 4-(2-(4,6-dimethoxypyrimidin-2-yloxy) benzylamino) benzoate(ZJ0273)(0, 100, 200 and 500 mg L–1) with or without 1 mg L–1 ALA treated for 48 or 72 h. Results showed that after 48 h of herbicide stress, the growth of rape seedlings was significantly inhibited with the successive increases of the ZJ0273 concentrations from 0 to 500 mg L–1, but this inhibition was obviously alleviated by exogenous application of ALA. However, when treatment time prolonged to 72 h, the recovery effects of ALA could not be evaluated due to the death of plants treated with the highest concentration of ZJ0273(500 mg L-1). Further, the root oxidizability and activities of antioxidant enzymes(superoxide dismutase, peroxidase and ascorbate peroxidase) were dramatically enhanced by the application of 1 mg L–1 ALA under herbicide stress. Therefore, plants treated with ALA dynamically modulated their antioxidant defenses to reduce reactive oxygen species(ROS) accumulation and malondialdehyde(MDA) content induced by herbicide stress. Additionally, exogenously applied ALA improved the ultrastructure's of chloroplast, mitochondria and nucleus, and induced the production of stress proteins. Our results suggest that ALA could be considered as a potential plant growth regulator for the improvement of herbicide tolerance through alleviation of the physiological and ultrastructural changes induced by the herbicide in crop production.  相似文献   

Genetic variation in cadmium tolerance is related to transport and antioxidant activities in field peas (Pisum sativum L.)     

Mohammad Farhadur Rahman  Monirul Islam  Most Champa Begum  Mohammad Firoz Alam 《Archives of Agronomy and Soil Science》2017,63(4):578-585

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Isolation of a fertile wheat-barley addition line carrying the entire barley chromosome 1H   总被引：1，自引：0，他引：1  

A.K.M. Rafiqul Islam  Kenneth W. Shepherd 《Euphytica》2000,111(2):145-149

The isolation of six of the seven possible additions of barley chromosomes to the wheat genome reported 18 years ago has made an important contribution to gene mapping in barley, first with genes controlling isozymes and more recently DNA (molecular) markers. A fertile addition line involving barley chromosome 1H,which carries genes controlling several characters of economic importance, could not be isolated at that time because it caused extreme meiotic abnormalities leading to complete sterility when added to wheat. Later the short arm of barley chromosome 1H was added to wheat as a fertile ditelosomic addition, but the non-availability of the entire barley chromosome 1H addition line has hampered the location of barley genes to the long arm of this chromosome. This problem has now been overcome cytogenetically as described herein. The resultant self-fertile disomic-monotelodisomic addition line carrying a pair of barley chromosome 6H and a heteromorphic 1H/1HS pair is more stable, and makes the wheat-barley addition line series complete for gene mapping work and will provide a vehicle for the possible transfer of useful genes from this barley chromosome to wheat.  相似文献   

Pests of Deepwater Rice and their Management     

H.D. Catling  Z. Islam 《Integrated Pest Management Reviews》1999,4(3):193-229

Deepwater rice has a distinctive pest complex due to prolonged deep flooding, extended growth duration and a complex environment. Flooding smothers weeds, prevents population buildups of some pests and diseases, and stimulates new growth which may compensate for early damage. Major pests are adapted to these aquatic conditions and exploit the succulent growth and mild weather extremes of this period.In Asia, yellow stem borer causes widespread damage by producing a loss of bearing stems, and lighter or empty panicles. No appropriate measures are known and control of this major pest is a daunting challenge. Stem nematode severely damages rice in several areas but varietal resistance is effective. Rats and hispa beetle are also injurious and many lesser pests are known. In West Africa's smaller Deepwater rice area, stem borers, leafeaters, birds and rats are damaging but their effect on yield is obscure. Farmers commonly employ cultural control methods, and insecticides are used in some areas but diseases are not treated. Pesticide use is restricted by application difficulties, contamination concerns and the low value of the crop. In Asia and Africa wild rices, grasses and sedges compete fiercely with rice before flooding; herbicides are not generally used but many farmers hand weed though the extent of yield loss is poorly understood.Pest management research in deepwater rice is difficult because of the nature of the agroecosystem. Most research has been carried out in Asia but the volume has seriously declined over the last decade.  相似文献   

Deforestation effects on vegetative regeneration and soil quality in tropical semi‐evergreen degraded and protected forests of Bangladesh     

K. R. Islam  M. R. Ahmed  M. K. Bhuiyan  A. Badruddin 《Land Degradation \u0026amp; Development》2001,12(1):45-56

Tropical forests of the world are degrading at an alarming rate because of human‐induced activities. This study was conducted to determine the consequences of deforestation on the natural regeneration of vegetation and soil quality in tropical, semi‐evergreen protected and degraded forest ecosystems of Bangladesh. In each forest ecosystem, 20 matured trees were randomly selected for laid‐out experimental plots by placing the tree stand at the center of the plot. The number of vegetative species, height, basal area, crown percentages and species richness were measured. The selected soil properties were determined. The vegetation in the protected forest site was denser with an abundance of species than in the degraded forest site. The primary forest regenerative species were dominated by the dipterocarps in both forest sites. The most alarming difference was that of an abrupt decline in regenerative forest species accompanied by an increase in exotic shrubs, grasses and vines typical of open habitats in the degraded forest site. These shrubs (e.g. Melastaoma, Lantana camara, Clerodendrum infortunatum and Jasminium spp.) and grasses and vines (e.g. Imperata cylindrica, Imperata arundinacea, Mikania scandenes, Saccharum spontaneum and Eupatorium odoratum) are gradually replacing the primary forest regenerative species in the degraded forest site. The soil quality of the degraded forest site has deteriorated over time due to preferential removal of finer particles and organic matter by accelerated water erosion. As a result, natural regeneration of primary forest species, especially dipterocarps, is severely affected by the direct effects of biotic interferences and attendant processes of soil quality degradation from deforestation. In contrast, degraded forest sites under regular protection have shown slow, but gradual, increase in crown frequency, enhanced recruitment and recovery of primary forest species, species abundance, and an improvement in soil quality. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

Elevated temperature affects growth and hemato‐biochemical parameters,inducing morphological abnormalities of erythrocytes in Nile tilapia Oreochromis niloticus     

SM Majharul Islam  Rabaya Sultana  Mohammad Imran  Mst. Fatema Tuj Jannat  Mohammad Ashaf‐Ud‐Doulah  Md. Fazle Rohani  Christopher Brown  Md. Shahjahan 《Aquaculture Research》2020,51(10):4361-4371

Temperature is considered as an important environmental factor, and the increasing water temperature resulting from global warming is a great concern. The present study was conducted to examine the effects of elevated water temperature on growth, hemato‐biochemical parameters in Nile tilapia, Oreochromis niloticus acclimatized to three temperatures (31°C, 34°C and 37°C) for 60 days. Additionally, erythrocytic cellular abnormalities (ECA) and erythrocytic nuclear abnormalities (ENA) tests were assayed using peripheral erythrocytes after exposure to the three temperatures. Fish were sacrificed on days 7, 15, 30 and 60 of exposure. Growth performances viz., weight gain, % weight gain and specific growth rate (SGR) showed decreasing tendency at 34°C but significantly declined at 37°C compared to 31°C. The abundance of haemoglobin (Hb) and red blood cells (RBCs) significantly decreased in response to temperature increases, while white blood cells (WBCs) displayed the opposite response. At days 7 and 15, blood glucose levels significantly increased in response to the temperature increase, while at days 30 and 60 glucose declined. Frequencies of ECA and ENA were significantly enhanced at the highest temperature throughout the experimental period. Dissolved oxygen decreased and free CO₂ increased significantly with increasing temperature throughout the study period. The present study revealed that temperatures higher than 34°C may be hazardous to O. niloticus.  相似文献   

Effect of time-restricted feeding and refeeding regimes on compensatory growth,body composition,and feed utilization in prawn (Macrobrachium rosenbergii) culture system     

Fahad Rahman  Shikder Saiful Islam 《Journal Of Applied Aquaculture》2020,32(3):236-249

ABSTRACT

A 14-week feeding experiment was conducted to determine the effect of a time-restricted feeding and refeeding regime on compensatory growth, body composition, and feed utilization in improved traditional prawn (Macrobrachium rosenbergii) culture systems. Three groups of prawn were used in which the control group (C) received feed regularly at ad libitum and the other two groups, Treatment 1 (T₁) and Treatment 2 (T₂), consumed feed 4 and 5 days per week respectively throughout the first 9 weeks. After feeding restriction, satiation of feed was given in the last 5 weeks. At the end of the experiment, the final weight of prawn in C, T₁, and T₂ were found to be 17.23 ± 6.56g, 16.04 ± 6.18g, and 15.64 ± 6.34 g respectively, which was insignificant. FCR decreased with increased restriction of feeding, while PER and NPU increased. Moisture content increased significantly, while protein and lipid content decreased significantly with increasing restriction time of feeding. After the satiation period, only the T2 group was able to replenish the lipid content. Water quality parameters didn’t vary significantly among the experimental groups and remained within optimum level. Therefore, time restriction could be applied in Macrobrachium rosenbergii culture without detrimental effects on growth, feed efficiency, and nutrient utilization.  相似文献   

Comparative performance of exotic and indigenous forest species for tropical semievergreen degraded forest land reforestation in Chittagong,Bangladesh     

K. R. Islam  M. Kamaluddin  M. K. Bhuiyan  Abu Badruddin 《Land Degradation \u0026amp; Development》1999,10(3):241-249

Exotic Acacia arabica, Acacia Auriculiformis, Eucalyptus camaldulensis, and Pinus caribaea, and indigenous Albizia lebbek, Cassia siamea, Chikrassia Tabularis, and Derris robusta were reforested in tropical semievergreen degraded forest lands to evaluate their capability of survival, growth, and biomass production in energy plantations. Three years after reforestation, significant variations in growth and biomass yield production were observed within each category of forest species. Both exotic and indigenous forest species had shown similar capability in the biomass production. Plant height was found a better predictor of biomass production than diameter at breast height. There have been improvements in soil properties under reforestation. Among the forest species, indigenous Cassia siamea and Derris robusta, and exotic Acacia auriculiformis were found highly adaptable, fast-growing, productive, and site improving, suitable for reforestation of degraded lands. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献