Root‐induced iron oxidation, pH changes and zinc solubilization in the rhizosphere of lowland rice

Kirk, G. J. D.; Bajita, J.B.

doi:10.1111/j.1469-8137.1995.tb03062.x

Cited by 156 publications

(116 citation statements)

References 18 publications

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“…If this is also true for rice, then rhizosphere effects could play a major role in Zn uptake. These rhizosphere effects may involve acidification of the rhizosphere (Kirk and Bajita, 1995) and exudation of Zn chelators (Tolay et al, 2001). Alternatively, or in addition, mycorrhizas could play a role (Purakayastha and Chhonkar, 2001).…”

Section: Discussionmentioning

confidence: 99%

Tolerance to Zinc Deficiency in Rice Correlates with Zinc Uptake and Translocation

et al. 2005

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To study variation in zinc efficiency (ZE) among current Chinese rice genotypes, a pot experiment was conducted with 15 aerobic and 8 lowland rice genotypes. Aerobic rice is currently bred by crossing lowland with upland rice genotypes, for growth in an aerobic cultivation system, which is saving water and producing high yields. A Zn deficient clay soil was used in our screening. Zn deficiency resulted in a marked decrease in shoot dry matter production of most genotypes after 28 days of growth. Genotypes were ranked according to their tolerance to Zn deficiency based on ZE, expressed as the ratio of shoot dry weight at Zn deficiency over that at adequate Zn supply. Substantial genotypic variation in ZE (50-98%) was found among both lowland and aerobic genotypes. ZE correlated significantly (P < 0.05) with Zn uptake (R 2 = 0.34), Zn translocation from root to shoot (R 2 = 0.19) and shoot Zn concentration (R 2 = 0.27). The correlation with seed Zn content was insignificant. In stepwise multiple regression analyses, variation in Zn uptake and Zn translocation explained 53% of variation in ZE. Variation in Zn uptake could be explained only for 32% by root surface area. These results indicate that Zn uptake may be an important determinant of ZE and that mechanisms other than root surface area are of major importance in determining Zn uptake by rice.

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Section: Discussionmentioning

confidence: 99%

Tolerance to Zinc Deficiency in Rice Correlates with Zinc Uptake and Translocation

et al. 2005

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“…In a nutrient solution, the resultant pH change will be dispersed throughout the solution; but in a soil or sediment this change will be propagated away from the roots more slowly and the pH at the root surface can often be 1-2 units lower than that in the soil bulk following chemical reduction. This will greatly alter the mobility of nutrients and toxins, as shown for Zn (Kirk & Bajita, 1995), cations in general (Kirk & Solivas, 1994) and P (Saleque & Kirk, 1995). A fall in pH will tend to increase the concentrations of Cu and Ni in solution in most soils and sediments.…”

Section: Discussionmentioning

confidence: 99%

Copper and nickel uptake, accumulation and tolerance in Typha latifolia with and without iron plaque on the root surface

et al. 1997

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SUMMARYThe effects of iron plaque on the growth of Typha latifolia L. and accumulation of copper and nickel in T. latifolia were investigated under laboratory conditions in nutrient solution cultures. Seedlings with and without iron plaque on their roots were exposed to 0-05 //^g ml"^ Cu and 010 //g m\~^ Ni solutions for 72 d. The results showed no differences in root and shoot d. wt and leaf elongation when Cu or Ni were added to the solution and in the presence or absence of plaque. However, root length was reduced by Cu and Ni, and the reduction in root length was greater in the presence of plaque. Some Cu and Ni was adsorbed on root surfaces; roots with plaque took up more Cu, but less Ni than those without. The presence of plaque did not alter Cu uptake and translocation but increased Ni uptake and translocation. Most of the Cu and Ni taken up was retained in the roots, suggesting that the root tissue rather than the root surface or plaque is the main barrier for Cu and Ni transport. The results differ from those reported for other species.

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“…It is established that rice roots can release O # at rates sufficient to support nonspecific aerobic microbial processes (Armstrong et al, 1990 ;Bedford et al, 1991 ;Begg et al, 1994 ;Kirk & Du, 1997) and to oxidize substantial quantities of iron and sulphate at the rhizosphere (Kirk & Bajita, 1995 ;Wind & Conrad, 1995, 1997Arth et al, 1998). The oxidation of NH % + to NO $ − appears equally possible (Reddy & Patrick, 1986 ;Mosier et al, 1990 ;Buresh et al, 1991 ;Arth et al, 1998) and must be tested.…”

Section: mentioning

confidence: 99%

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

et al. 2000

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Nitrogen limitation compromises the realization of yield potential in cereals more than any other single factor. In rice, the world's most important crop species, the assumption has long been that only ammonium-N is efficiently utilized. Consequently, nitrate utilization has been largely ignored, although fragmentary data have suggested that growth could be substantial on nitrate. Using the short-lived radiotracer "$N, we here provide direct comparisons of root transmembrane fluxes and cytoplasmic pool sizes for nitrate-and ammonium-N in a major variety of Indica rice (Oryza sativa), and show that nitrate acquisition is not only of high capacity and efficiency but is superior to that of ammonium. We believe our results have implications for rice breeding and molecular genetics as well as the design of water-management and fertilization regimes. Potential strategies to harness this hitherto unexplored N-utilization potential are proposed.

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Root‐induced iron oxidation, pH changes and zinc solubilization in the rhizosphere of lowland rice

Cited by 156 publications

References 18 publications

Tolerance to Zinc Deficiency in Rice Correlates with Zinc Uptake and Translocation

Tolerance to Zinc Deficiency in Rice Correlates with Zinc Uptake and Translocation

Copper and nickel uptake, accumulation and tolerance in Typha latifolia with and without iron plaque on the root surface

Comparative kinetic analysis of ammonium and nitrate acquisition by tropical lowland rice: implications for rice cultivation and yield potential

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