11 research outputs found
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Weed diversity of the family Poaceae in Bangladesh Agricultural University campus and their ethnobotanical uses
No full textA taxonomic study on the weeds of the family Poaceae growing throughout the Bangladesh Agricultural University campus was carried out to determine species diversity of grasses in the campus. A total of 81 species under 46 genera and 2 subfamilies of the family Poaceae were collected and identified; their uses in various ailments were also recorded. Out of the three subfamilies, no weed from the subfamily Bambusoideae was found. Among the genera, Digitaria, Eragrostis, Brachiaria, Panicum, Echinochloa and Sporobolus were most dominant in context to number of species with a total of 29 species. While 28 genera were represented by single species each in BAU campus; of these 15 genera were in Bangladesh as well. Some of them are major and obnoxious weeds in different crop fields including staples rice and wheat. The flowering period will be helpful for the management of respective weed population. Many of these weed species have high economical, ethnomedicinal and other uses. The phenological study of these weed taxa will be helpful in managing weeds of the family Poaceae of this campus as well as the whole country without affecting the agro-ecosystem by keeping the weed population below a threshold level
Reassessment of cyperaceous weed biodiversity at Bangladesh Agricultural University campus
No full textA floristic survey has been carried out from January 2015 to January 2016 to investigate the species diversity of Cyperaceous weeds present at Bangladesh Agricultural University campus. A total of 48 species belonging to 11 genera has been collected and identified. Among these, the prominent genus was Fimbristylis (13 species) followed by Cyperus (12 species) and three genera viz. Actinoscirpus, Bolboshoenus and Fuirena were represented by single species. Result of the present study revealed that some of these species are major and common obnoxious weeds in different crop fields. A good number of these species have great medicinal uses, fodder, raw materials for small industries and other economic values. The detailed taxonomic studies of these weeds will be helpful for the management practices of Cyperaceous weeds at this campus as well as in the whole country. It might be concluded that development of improved cultivation procedures will be helpful for getting high economic benefits from Cyperaceous weeds without affecting our crop yield and agro-ecosystem. There is no direct evidence of climate change threatening or eliminating Cyperaceae taxa from this locality
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Reassessment of cyperaceous weed biodiversity at Bangladesh Agricultural University campus
No full textA floristic survey has been carried out from January 2015 to January 2016 to investigate the species diversity of Cyperaceous weeds present at Bangladesh Agricultural University campus. A total of 48 species belonging to 11 genera has been collected and identified. Among these, the prominent genus was Fimbristylis (13 species) followed by Cyperus (12 species) and three genera viz. Actinoscirpus, Bolboshoenus and Fuirena were represented by single species. Result of the present study revealed that some of these species are major and common obnoxious weeds in different crop fields. A good number of these species have great medicinal uses, fodder, raw materials for small industries and other economic values. The detailed taxonomic studies of these weeds will be helpful for the management practices of Cyperaceous weeds at this campus as well as in the whole country. It might be concluded that development of improved cultivation procedures will be helpful for getting high economic benefits from Cyperaceous weeds without affecting our crop yield and agro-ecosystem. There is no direct evidence of climate change threatening or eliminating Cyperaceae taxa from this locality
Weed diversity of the family Poaceae in Bangladesh Agricultural University campus and their ethnobotanical uses
No full textA taxonomic study on the weeds of the family Poaceae growing throughout the Bangladesh Agricultural University campus was carried out to determine species diversity of grasses in the campus. A total of 81 species under 46 genera and 2 subfamilies of the family Poaceae were collected and identified; their uses in various ailments were also recorded. Out of the three subfamilies, no weed from the subfamily Bambusoideae was found. Among the genera, Digitaria, Eragrostis, Brachiaria, Panicum, Echinochloa and Sporobolus were most dominant in context to number of species with a total of 29 species. While 28 genera were represented by single species each in BAU campus; of these 15 genera were in Bangladesh as well. Some of them are major and obnoxious weeds in different crop fields including staples rice and wheat. The flowering period will be helpful for the management of respective weed population. Many of these weed species have high economical, ethnomedicinal and other uses. The phenological study of these weed taxa will be helpful in managing weeds of the family Poaceae of this campus as well as the whole country without affecting the agro-ecosystem by keeping the weed population below a threshold level
Effect of salt stress on growth of sorghum germplasms at vegetative stage
No full textSoil salinity is an increasing problem in the world and main obstacle to agricultural productivity especially in areas where irrigation is necessary. It adversely affects plant growth and development. Adoption of salt tolerant variety is more important here and so screening of salt tolerant germplasms is essential. For this reason, a germination test under salinity and a hydroponic experiment were conducted at Plant Physiology Laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh to investigate the effect of NaCl on germination, morphological characters and growth of sorghum seedlings. The experiment comprised of two levels of NaCl concentration viz. Control (without NaCl and EC 1.36 dSm−1 in hydroponic culture) and 80 mM NaCl and five sorghum germplasms viz. BD 700, BD 703, BD 707, BD 710 and BD 726. There were 10 (5×2) treatments in a completely randomized design (CRD) with three replications. Results showed that germination percentage, hypocotyls and epicotyls length, root and shoot length, leaf length, leaf sheath length, fresh and dry mass production were influenced by NaCl stress. However, among tested germplasms, BD 707 showed the best performance considering the seedlings growth, germination percentage and other parameters. BD 710 and BD 703 showed the highest sensitivity to NaCl stress based on the above parameters studied. These results suggested that sorghum is able to grow with moderate salinity.J. Bangladesh Agril. Univ. 16(1): 67-72, April 2018</jats:p
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Effect of salt stress on growth of sorghum germplasms at vegetative stage
No full textSoil salinity is an increasing problem in the world and main obstacle to agricultural productivity especially in areas where irrigation is necessary. It adversely affects plant growth and development. Adoption of salt tolerant variety is more important here and so screening of salt tolerant germplasms is essential. For this reason, a germination test under salinity and a hydroponic experiment were conducted at Plant Physiology Laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh to investigate the effect of NaCl on germination, morphological characters and growth of sorghum seedlings. The experiment comprised of two levels of NaCl concentration viz. Control (without NaCl and EC 1.36 dSm−1 in hydroponic culture) and 80 mM NaCl and five sorghum germplasms viz. BD 700, BD 703, BD 707, BD 710 and BD 726. There were 10 (5×2) treatments in a completely randomized design (CRD) with three replications. Results showed that germination percentage, hypocotyls and epicotyls length, root and shoot length, leaf length, leaf sheath length, fresh and dry mass production were influenced by NaCl stress. However, among tested germplasms, BD 707 showed the best performance considering the seedlings growth, germination percentage and other parameters. BD 710 and BD 703 showed the highest sensitivity to NaCl stress based on the above parameters studied. These results suggested that sorghum is able to grow with moderate salinity
Effect of salt stress on growth of sorghum germplasms at vegetative stage
No full textSoil salinity is an increasing problem in the world and main obstacle to agricultural productivity especially in areas where irrigation is necessary. It adversely affects plant growth and development. Adoption of salt tolerant variety is more important here and so screening of salt tolerant germplasms is essential. For this reason, a germination test under salinity and a hydroponic experiment were conducted at Plant Physiology Laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh to investigate the effect of NaCl on germination, morphological characters and growth of sorghum seedlings. The experiment comprised of two levels of NaCl concentration viz. Control (without NaCl and EC 1.36 dSm−1 in hydroponic culture) and 80 mM NaCl and five sorghum germplasms viz. BD 700, BD 703, BD 707, BD 710 and BD 726. There were 10 (5×2) treatments in a completely randomized design (CRD) with three replications. Results showed that germination percentage, hypocotyls and epicotyls length, root and shoot length, leaf length, leaf sheath length, fresh and dry mass production were influenced by NaCl stress. However, among tested germplasms, BD 707 showed the best performance considering the seedlings growth, germination percentage and other parameters. BD 710 and BD 703 showed the highest sensitivity to NaCl stress based on the above parameters studied. These results suggested that sorghum is able to grow with moderate salinity
Seed quality status of rice varieties based on physical properties, seed health and proximate composition
No full textIn the present study, seed quality status of fifteen rice varieties were evaluated for physical properties, health status and proximate composition. Physical properties like moisture content, seed purity, germination and vigor index varied between 11.77-14.67%, 96.08-98.93%, 96.50 to 99.00% and 1972.74 to 2639.76, respectively. The shoot length and root length of seedlings were from 8.93 cm to 12.99 cm and 10.89 cm to 14.22 cm, respectively. Seed health was determined by blotter test method. Five seed-borne fungi were detected and the identified fungi were Bipolaris oryzae (1.00-8.50%.), Fusarium moniliforme (0.50-3.50%), Fusarium oxysporum (0.50-9.00%.), Curvularia lunata (0.00-7.50%) and Alternaria padwickii (0.00-4.00%). Proximate composition analysis assessment was done using Association of Official Analytical Chemists (AOAC) method. The dry matter, ash, crude fiber, crude protein, crude fat and carbohydrate were between 92.52- 93.77%, 2.39-6.70%, 8.65-14.27%, 6.51-9.13%, 1.23-1.97% and 62.84-71.06%, respectively
SEED PRIMING AND EXOGENOUS APPLICATION OF SALICYLIC ACID ENHANCE GROWTH AND PRODUCTIVITY OF OKRA (Abelmoschus esculentus L.) BY REGULATING PHOTOSYNTHETIC ATTRIBUTES
No full textLow and uneven germination is a serious problem for the successful production of okra seedlings. Priming of seeds as well as supplementation of different plant growth regulators exhibited better response in successful seedling production which eventually results in higher yield. Therefore, the present study was conducted to evaluate the effects of seed priming and exogenous application of salicylic acid (SA) on okra seed germination and plant development. The okra seeds were primed by 1 mM and 2 mM of SA for 60 minutes whereas the seeds were washed several times with distilled water for the control treatment. Similar doses of SA have been exogenously sprayed to the 12 days okra seedlings for 4 days. The results of the study revealed that seed priming with SA enhanced germination percentage (GP), increased coleoptile length and weight, shoot and root length, and seed vigor index (SVI). Similarly, exogenous application of 1 mM SA increased relative water content (RWC), contents of chlorophyll a, chlorophyll b, total chlorophyll while a higher dose of SA (2 mM) degraded the leaf pigments. Supplementation of SA altered photosynthetic attributes, net photosynthetic (Pn) and transpiration rate (Tr), stomatal conductance (Gs), and water use efficiency (WUE). Moreover, SA treatment reduced the time duration of flower bud initiation and days to first flowering and enhanced the yield per plant. The results of this study indicated that seed priming and exogenous application of SA enhanced germination and okra productivity by regulating RWC and photosynthetic attributes where 1 mM SA is more effective compared to 2 mM SA
Mitigation of Salinity-Induced Growth Inhibition of Maize by Seed Priming and Exogenous Application of Salicylic Acid
No full textSoil salinity has come to be recognized as a global challenge to the sustainability of farming systems due to its adverse effects on crop quality and production, particularly in coastal regions of the world. Although maize (Zea mays L.), a C4 plant, has the capacity to withstand a medium degree of salinity, maize is vulnerable to salinity stress during its early growth phases. Therefore, in order to develop strategies to improve maize adaptability in saline settings, it is essential to increase our understanding of maize response to salt stress and tolerance mechanisms. According to reports, plants are known to be able to withstand salt stress when phytohormones are applied. Salicylic acid (SA), a widely-used plant hormone, has been shown to increase a plant\u27s ability to withstand salt stress. In order to reduce the growth inhibition of maize caused by salt, the aim of this study was to clarify and assess the potential impact of priming and exogenous administration of salicylic acid (SA). The results revealed that salt stress decreased seed germination, seedling fresh and dry weight, leaf relative water content (RWC), and photosynthetic pigments of maize. Salicylic Acid (SA) treatment increased germination percentage (43-69%), shoot (24-56%) and root length (13-37%), dry weight of shoot and root (35-171%), RWC (34-39%), and chlorophyll contents (12-36%) of maize under salt stress. The findings highlight the need for additional research to fully understand the underlying mechanisms and explore SA\u27s potential mitigating effects in lowering salt stress as well as its potential practical applications in agricultural practices
