Role of soil microorganisms in improving P nutrition of plants

Gyaneshwar, Prasad; Archana, G.; Parekh, L. J.; Poole, Philip S.

doi:10.1007/978-94-017-1570-6_15

Cited by 405 publications

(415 citation statements)

References 51 publications

Supporting

Mentioning

344

Contrasting

Unclassified

Order By: Relevance

“…Phosphate is required in high amounts to compensate for crop removal and fi xation by soils. Despite its wide distribution in nature, it is defi cient nutrient in most soils because the concentration of free phosphorus, the form available to plants, even in fertile soils, is generally not higher than 10 M even at pH 6.5 where it is most soluble [1]. Hence, there is a need to have a comprehensive approach [2,3] to P application for sustainable crop production thus enhancing its use effi ciency.…”

Section: Introductionmentioning

confidence: 99%

Rock phosphate dissolution by specific yeast

2009

View full text Add to dashboard Cite

Phosphate solubilizing yeast (PSY) were isolated from rhizosphere, non-rhizosphere and fruits from Bhavnagar district. The potential of 25 yeasts were analyzed on the basis of phosphate solubilizing zone to growth on solid medium denoted as solubilization index (SI) which ranged from 1.10 to 1.50. Among 25 yeast isolates, 6 yeast belonging to genus Saccharomyces (2), Hansenula, Klockera, Rhodotorula and Debaryomyces exhibited highest SI (1.33-1.50) were further examined for in vitro tricalcium phosphate (TCP) and low grade rock phosphate (RP) solubilization. TCP proved superior to RP with all the yeasts. Within low grade RPs tested, except isolate Y5, all isolates showed maximum solubilization with Hirapur RP (HRP) ranging from 7.24 to 19.30 mg% P 2 O 5 . Among six PSY screened, Debaryomyces hansenii showing maximal HRP solubilization was chosen for further physiological studies. Maximum HRP solubilization was expressed in following condition: pH optima 7.0, temperature optima 28°C and optimal period of incubation were 15 days. Acidic pH of the spent media was a constant feature in all the cases. No correlation could be established between fi nal acidity produced by yeasts and the quantity of phosphate liberated.

show abstract

Section: Introductionmentioning

confidence: 99%

Rock phosphate dissolution by specific yeast

2009

View full text Add to dashboard Cite

show abstract

“…A survey of Indian soils revealed that 98% of soils are defi cient in P because the concentration of free phosphorous, the form available to plants even in fertile soils is generally not higher than 10 μM even at pH 6.5 where it is most soluble [5]. These low levels of P are due to high reactivity of soluble P with Ca, Fe or Al that leads to precipitation.…”

Section: Introductionmentioning

confidence: 99%

Relationship of physicochemical properties of rhizosphere soils with native population of mineral phosphate solubilizing fungi

Narsian

Patel

2009

Indian J Microbiol

View full text Add to dashboard Cite

Phosphate solubilizing fungi (PSF) were enumerated in 78 rhizosphere soil samples collected from various sites of Bhavnagar district with agro climatic zone of hot, semi-arid region of Gujarat. 81% of samples were inhabited with indigenous PSF; the count varied ranging from 0.01 to 90 × 10 3 PSF g -1 . PSF population in the rhizosphere soils were maximal at pH 7.4-8.4, electrical conductivity (EC) 1-2 dS m -1 wherein PSF population decreased with a rise in EC. Optimal moisture content ranged ≤10-30% where the abundance of PSF always decreased with increase in moisture levels while suitable organic matter content ranged from ≤0.5-4.5%. Available P range 100-300 mg kg -1 was the most suitable for occurrence of PSF as being noticed from number of soil samples harboring them in rhizosphere soils. Amongst the various rhizosphere soil properties studied, a highly signifi cant positive correlation was established between PSF and soil available P as well as pH. A signifi cant positive association observed between total fungal population and organic matter as well as soil available P. Both abundance and number of PSF were more pronounced in descending order in plant covers: oilseeds, fl owers, orchards, vegetables, pulses and cereals.

show abstract

“…Inorganic phosphates in acidic soils are associated with iron (Fe) and Al compounds; whereas calcium (Ca) phosphates are predominant inorganic phosphate form in neutral or calcareous soils (Gyaneshwar et al, 2002). Unfavorable pH and high reactivity of Al and Fe in acidic soils decrease phosphorous availability as well as phosphatic fertilizer efficiency (Hao et al, 2002).…”

Section: Effect Of Aluminum On Citrusmentioning

confidence: 99%

How do Citrus Crops Cope with Aluminum Toxicity?

Arunakumara¹,

Walpola²,

Yoon³

2012

Korean Journal of Soil Science and Fertilizer

View full text Add to dashboard Cite

World Agriculture faces daunting challenges in feeding the growing population today. Reduction in arable land extent due to numerous reasons threatens achievement of food and nutritional security. Under this back ground, agricultural use of acidic soils, which account for approximately 40 % of the world arable lands is of utmost important. However, due to aluminum (Al) toxicity and low available phosphorous (P) content, crop production in acidic soils is restricted. Citrus, in this context, gains worldwide recognition as a crop adapted to harsh environments. The present paper reviewed Al toxicity and possible toxicity alleviation tactics in citrus. As reported for many other crops, inhibition of root elongation, photosynthesis and growth is experienced in citrus also due to Al toxicity. Focusing at toxicity alleviation, interaction between boron (B) and Al as well as phosphorus and Al has been discussed intensively. Al toxicity in citrus could be alleviated by P through increasing immobilization of Al in roots and P level in shoots rather than through increasing organic acid secretion, which has been widely reported in other crops. Boron-induced changes in Al speciation and/or sub-cellular compartmentation has also been suggested in amelioration of root inhibition in citrus. Despite the species-dependent manner of response to Al toxicity, many commercially important citrus species can be grown successfully in acidic soils, provided toxicity alleviation Agro-biological tactics such as addition of phosphorous fertilizers are used properly.

show abstract

Role of soil microorganisms in improving P nutrition of plants

Cited by 405 publications

References 51 publications

Rock phosphate dissolution by specific yeast

Rock phosphate dissolution by specific yeast

Relationship of physicochemical properties of rhizosphere soils with native population of mineral phosphate solubilizing fungi

How do Citrus Crops Cope with Aluminum Toxicity?

Contact Info

Product

Resources

About