Phosphate Nutrition of Plants-A General Treatise

Ozanne, PG

doi:10.2134/1980.roleofphosphorus.c21

Cited by 59 publications

(34 citation statements)

References 71 publications

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“…Most Pi enters the root through root hairs or outermost cell layer, while the inner cortical cell only contributes when the transpiration flow or the Pi concentration is very high. Phosphate moves radially across the root to the endodermis via transpiration stream through the "outer free space" located in the wall of epidermal and cortical cells, and the intercellular films of moisture, while phosphate taken up into symplasm moves by division and protoplasmic streaming (Ozanne, 1980). Inorganic P moves across the cortex in the symplasms, while direct diffusional movement of Pi firom soil to stele via the apparent free space is halted at the endodermis by the casparian band, the hydrophobic layer encircling the stele (Bieleski, 1973;Ozanne, 1980).…”

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

“…Phosphate moves radially across the root to the endodermis via transpiration stream through the "outer free space" located in the wall of epidermal and cortical cells, and the intercellular films of moisture, while phosphate taken up into symplasm moves by division and protoplasmic streaming (Ozanne, 1980). Inorganic P moves across the cortex in the symplasms, while direct diffusional movement of Pi firom soil to stele via the apparent free space is halted at the endodermis by the casparian band, the hydrophobic layer encircling the stele (Bieleski, 1973;Ozanne, 1980). The last step in Pi uptake from soil to xylem is the unloading P from the symplasm into xylem vessels, in which the movement involves some sort of pump (Ozanne, 1980).…”

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

“…Inorganic P moves across the cortex in the symplasms, while direct diffusional movement of Pi firom soil to stele via the apparent free space is halted at the endodermis by the casparian band, the hydrophobic layer encircling the stele (Bieleski, 1973;Ozanne, 1980). The last step in Pi uptake from soil to xylem is the unloading P from the symplasm into xylem vessels, in which the movement involves some sort of pump (Ozanne, 1980). The requirements for this pump are different compared to the accumulating pump in the cortical cell since it need not function against a concentration gradient.…”

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

“…From the plant stand point, the geometry of root system has significant effect on determining the ability of plant to uptake P, in which the more roots, the more P can be taken up; so that plant with finer roots, large surface areas and greater root length per unit weight should be able to draw Pi fi:om a bigger volume of soil and increase the P uptake (Bieleski, 1973). Later, in his review Ozanne (1980) stated that the length of the root, and maybe also the length of root hairs have the most important role in P uptake. When the length of roots available to absorb each unit of P needed in the plant tops increased, the level of P fertilizer required by plant decreased.…”

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

“…There is a significant effect of water flux across the root and into the xylem on the rate of P transferred to the xylem and thus upward to the shoot. The increase of transportation stream by introducing more rapid movement of P across the symplast may dilute P concentration within it and so favors P transfer to the shoot rather than accumulated in the vacuoles of the root cells (Ozanne, 1980 (Tisdale et al,, 1993), especially for the countries having high chemical fertilizer application.…”

Section: Phosphorus Transport In Plantsmentioning

confidence: 99%

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Biotechnology by-products and animal manures as sources of phosphorus for plants

Sutarta¹

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality or the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from lefr to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book.

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Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

Section: Phosphorus Uptake Bv Plantsmentioning

confidence: 99%

Section: Phosphorus Transport In Plantsmentioning

confidence: 99%

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Biotechnology by-products and animal manures as sources of phosphorus for plants

Sutarta¹

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Phosphorus Deficiency in Plants: Responses, Adaptive Mechanisms, and Signaling

Aziz

Ṣābir

Farooq

et al. 2013

Plant Signaling: Understanding the Molecular Crosstalk

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Phosphorus (P) defi ciency is a common nutritional factor limiting agricultural production around the globe. Application of phosphatic fertilizers is generally recommended to cope with P defi ciency; however, low use efficiency of available P fertilizers both in calcareous and acid soils limits its viability and also had serious environmental concerns. Higher plants have adapted a number of mechanism to live with low available P in soil such as changes in root morphology and architecture, decreased growth rate, improved P uptake and utilization effi ciency, and exudation of organic acids and enzymes to solubilize external inorganic and organic P compounds in the rhizosphere. Plant species and even cultivars widely differ in P effi ciency because of differences in one or more of these mechanisms. Exploitation of these genetic variations among crop plants can sustain agricultural production. Understanding the mechanism involved in sensing P defi ciency could facilitate selection, breeding, and genetic engineering approaches to improve crop production in P-stressed environments and could reduce dependence on nonrenewable inorganic P resources. In this chapter, we briefl y reviewed the responses of P defi ciency in higher plants, their adaptive mechanisms, and signaling pathways.

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Role of Phosphate Solubilizing Microorganisms in Sustainable Agriculture - A Review

Khan¹,

Zaidi²,

Wani³

2009

Sustainable Agriculture

115

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Compared with the other major nutrients, phosphorus is by far the least mobile and available to plants in most soil conditions. Although phosphorus is abundant in soils in both organic and inorganic forms, it is frequently a major or even the prime limiting factor for plant growth. The bioavailability of soil inorganic phosphorus in the rhizosphere varies considerably with plant species, nutritional status of soil and ambient soil conditions. To circumvent phosphorus deficiency, phosphate-solubilizing microorganisms (PSM) could play an important role in supplying phosphate to plants in a more environmentally-friendly and sustainable manner. The solubilization of phosphatic compounds by naturally abundant PSM is very common under in vitro conditions; the performance of PSM in situ has been contradictory. The variability in the performance has thus greatly hampered the large-scale application of PSM in sustainable agriculture. Numerous reasons have been suggested for this, but none of them have been conclusively investigated. Despite the variations in their performance, PSM are widely applied in agronomic practices in order to increase the productivity of crops while maintaining the health of soils. This review presents the results of studies on the utilization of PSM for direct application in agriculture under a wide range of agro-ecological conditions with a view to fostering sustainable agricultural intensification in developing countries of the tropics and subtropics.

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Phosphate Nutrition of Plants-A General Treatise

Cited by 59 publications

References 71 publications

Biotechnology by-products and animal manures as sources of phosphorus for plants

Biotechnology by-products and animal manures as sources of phosphorus for plants

Phosphorus Deficiency in Plants: Responses, Adaptive Mechanisms, and Signaling

Role of Phosphate Solubilizing Microorganisms in Sustainable Agriculture - A Review

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