Xem 1-20 trên 56 kết quả Salinity stress
  • Salinity stress negatively impacts agricultural yield throughout the world affecting production whether it is for subsistence or economic gain. The plant response to salinity consists of numerous processes that must function in coordination to alleviate both cellular hyperosmolarity and ion disequilibrium. In addition, crop plants must be capable of satisfactory biomass production in a saline environment (yield stability).

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  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Water relation characteristics and photosynthesis of saline-stressed seedlings of non-halophyte species...

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  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of saline stress on Eucalyptus seedlings...

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  • Growth and productivity of higher plants are adversely affected by various environmental stresses which are of two main types, biotic and abiotic, depending on the source of stress. Broad range of abiotic stresses includes osmotic stress caused by drought, salinity, high or low temperatures, freezing, or flooding, as well as ionic, nutrient, or metal stresses, and others caused by mechanical factors, light, or radiation.

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  • The primary objective of the ebook is to deliver a thoughtful combination of viewpoints which will be valuable to workers in all places of plant sciences. The material included in this ebook will be important in building methods to counter water anxiety in crops. Vegetation encounter drinking water anxiety both when the h2o provide to their roots becomes limiting, or when the transpiration rate gets to be intense. H2o stress is primarily caused by a h2o deficit, this sort of as a drought or higher soil salinity....

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  • Abstract: The impact of salinity on three arboreal mangrove plants, Sonneratia apetala (Sa), S. caseolaris (Sc) and Rhizophora stylosa (Rs), was studied. The three mangrove species were treated with different salinity levels over a three-month period. The response and adaptation of these three mangrove species to salinity were shown to be different. Net photosynthesis rate, stomata conductance and transpiration rate of leaves decreased and soluble sugar content in leaves increased, with salt concentration in all three mangrove species.

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  • Abiotic stresses are serious threats to agriculture and the environment which have been exa‐ cerbated in the current century by global warming and industrialization. According to FAO statistics, more than 800 million hectares of land throughout the world are currently salt-af‐ fected, including both saline and sodic soils equating to more than 6% of the world’s total land area. Continuing salinization of arable land is expected to have overwhelming global impact, resulting in a 30% loss of agricultural land over the next 25 years and up to 50% loss by 2050.

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  • Nitric oxide enhances salt secretion and Na+ sequestration in a mangrove plant, Avicennia marina, through increasing the expression of H+-ATPase and Na+/H+ antiporter under high salinity.

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  • Phototrophy is the process by which organisms trap photons and store energy as chemical energy in the form of adenosine triphosphate (ATP). ATP transports chemical energy within cells for metabolism. There are three major types of phototrophy: Oxygenic and Anoxygenic photosynthesis, and Rhodopsin-based phototrophy. Photosynthesis is a chemical process that converts carbon dioxide into different organic compounds using solar energy. Oxygenic and anoxygenic photosynthesis undergo different reactions in the presence and absence of light (called light and dark reactions, respectively).

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  • Tham khảo sách 'salinity management for sustainable irrigation integrating science', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Three major approaches can be used in an effort to segment a market. 22 They include the a-priori, a-posteriori and hybrid approach. The selection of an approach depends on the objectives of the researcher in undertaking a segmentation study. In a-priori (predetermined) market segmentation, the type (segmentation variables) and number of market segments are determined before data collection. With this ap- proach, there are two main questions, namely the estimated sizes of these segments in the market place, and some relevant segment characteristics ( descriptor variables).

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  • Mechanisms of salt tolerance in halophytes: can crop plants resistance to salinity be improved? High concentrations of sodium are toxic to most plant species, making soil salinity a major abiotic stress in plant productivity world wide. Many crop species, which countless people rely for survival, are negatively affected.

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  • Over the past decade, our understanding of plant adaptation to environmental stress, including both constitutive and inducible determinants, has grown con- siderably. This book focuses on stress caused by the inanimate components of the environment associated with climatic, edaphic and physiographic factors that substantially limit plant growth and survival. Categorically these are abiotic stresses, which include drought, salinity, non-optimal temperatures and poor soil nutrition.

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  • Plants are sessile organisms and as such must have mechanisms to deal with both abiotic and biotic stresses to ensure survival. The term “abiotic stress” includes many stresses caused by environmental conditions such as drought, salinity, UV and extreme temperatures. Due to global climate change it is predicted that abiotic stresses will increase in the near future and have substantial impacts on crop yields (Intergovernmental Panel of Climate Change; http://www.ipcc.ch).

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  • The Bank, IMF and World Bank participated in a Government Forum organized in March 2011 to discuss the recently approved Strategy for Arrears Clearance. A major conclusion from the workshop was the importance of reaching agreement on a Staff Monitored Program with the IMF as a critical component of the path towards arrears clearance and debt relief and a grandfathering of Zimbabwe by the IDA Executive Board if it is to benefit from the HIPC Initiative.

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  • Canadian GAAP requires the use of bid prices for long positions and ask prices for short positions in the fair valuation of investments traded in an active market, rather than the use of closing prices currently used for the purpose of determining Net Asset Value (“NAV”). For investments that are not traded in an active market, Canadian GAAP requires the use of valuation techniques, incorporating factors that market participants would consider in setting a price.

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  • The three mangrove species were treated with different salinity levels over a three-month period. The response and adaptation of these three mangrove species to salinity were shown to be different. Net photosynthesis rate, stomata conductance and transpiration rate of leaves decreased and soluble sugar content in leaves increased, with salt concentration in all three mangrove species. The malondial dehyde (MDA) content in stems and leaves of Sa and Sc

    pdf6p nguyenngocsonctu 21-11-2010 49 5   Download

  • On the other hand, salinity affects 7-9 % of the world’s land area (Szabolcs, 1994), and the area is increasing (Ghassemi et al., 1995). Nowadays, one of the major technological goals of the energy production is the replacement of the fossil-based fuel for biofuel, mainly due to environmental issues. Bearing that in mind, it is mandatory to investigate the effect of water deficit and salinity stress in plant species with high potential for application in large scale production of nonfossil based fuels....

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  • Genetic diversity is the fundamental source of biodiversity – the total number of genetic characters contributing to variation within species. In other words it is the measure that quantifies the variation found within a population of a given species. Genetic diversity among individuals reflects the presence of different alleles in the gene pool, and hence different genotypes within populations. Genetic diversity should be distinguished from genetic variability, which describes the tendency of genetic traits found within populations to vary (Laikre et al., 2009).

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  • The Appendix consists of three tables. The first table lists the INNs of pharmaceutical active ingredients that are eligible for duty-free treatment. The second table consists of chemical prefixes and suffixes that may be combined with the INNs to specify pharmaceutical derivatives that are also included in the agreement. The third table specifies the chemical intermediates for which duties have been eliminated. U.S. imports of products included in the Pharmaceutical Appendix totaled over $85 billion in 2009; U.S. exports of these products exceeded $41 billion.

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