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

Gao, Xiaopeng; Zou, Chunqin; Zhang, Fusuo; Zee, S.E.A.T.M. van der; Hoffland, Ellis

doi:10.1007/s11104-005-8674-y

Cited by 55 publications

(40 citation statements)

References 31 publications

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“…In line with Gao et al (2005), we found considerable genotypic variation in Zn efficiency and yield under aerobic conditions. Our results confirm preliminary results demonstrating that K150 is a zinc inefficient genotype (Table 3).…”

Section: Discussionsupporting

confidence: 77%

From Flooded to Aerobic Conditions in Rice Cultivation: Consequences for Zinc Uptake

et al. 2006

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Scarcity of water causes a shift from flooded to aerobic conditions for rice production in zinc deficient areas in Northern China. This shift alters soil conditions that affect zinc availability to the crop. This paper concerns the effect of aerobic compared to flooded conditions on crop biomass production, grain yield and zinc content. A field experiment was done with six rice genotypes (Oryza sativa L.) grown on a calcareous soil, both with (23 kg Zn ha )1 ) and without Zn fertilization. Sampling was conducted at tillering and physiological mature stage. Zn concentration in the shoots was significantly lower at both stages in plants grown in the aerobic field. At maturity, Zn uptake, biomass production, grain yield and Zn-harvest index [grain Zn/(shoot + grain Zn)] were lower under aerobic cultivation. Rice genotypes including aerobic rice and lowland rice differ in degree of response to low Zn supply. A twofold difference was found among aerobic genotypes in grain yield and Zn uptake. Also Zn-harvest index varied significantly. Zn application affected neither grain yield nor grain Zn content, although it significantly improved biomass production in both systems in most genotypes. These results demonstrate that introduction of aerobic rice systems on calcareous soils may increase Zn deficiency problems.

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Section: Discussionsupporting

confidence: 77%

From Flooded to Aerobic Conditions in Rice Cultivation: Consequences for Zinc Uptake

et al. 2006

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“…Thus, plant Zn uptake from low Zn soils can, apart from Zn fertilization (Rengel et al 1999), be enhanced by engineering Zn efficiency in plants (Ramesh et al 2004), selecting genotypes that inherently can take up Zn efficiently (Hacisalihoglu and Kochian 2003) or by inoculation with arbuscular mycorrhizal fungi (AMF). In a previous paper (Gao et al 2005) we showed large variation in Zn uptake among nonmycorrhizal aerobic rice genotypes. In the current study we investigate whether inoculation of these genotypes with AMF could further increase Zn uptake.…”

Section: Introductionmentioning

confidence: 73%

“…So far, breeding has mainly been focused on yield and drought resistance of aerobic genotypes. Previously we have shown that there is considerable variation in Zn uptake from low Zn soils among newly bred genotypes (Gao et al 2005). We are unaware of previous reports on genotypic variation in mycorrhizal responsiveness based on Zn uptake in any plant species.…”

Section: Introductionmentioning

confidence: 96%

Mycorrhizal responsiveness of aerobic rice genotypes is negatively correlated with their zinc uptake when nonmycorrhizal

et al. 2006

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Plant Zn uptake from low Zn soils can be increased by Zn-mobilizing chemical rhizosphere processes. We studied whether inoculation with arbuscular mycorrhizal fungi (AMF) can be an additional or an alternative strategy. We determined the effect of AMF inoculation on growth performance and Zn uptake by rice genotypes varying in Zn uptake when nonmycorrhizal. A pot experiment was conducted with six aerobic rice genotypes inoculated with Glomus mosseae or G. etunicatum or without AMF on a low Zn soil. Plant growth, Zn uptake and mycorrhizal responsiveness were determined. AMFinoculated plants produced more biomass and took up more Zn than nonmycorrhizal controls. Mycorrhizal inoculation, however, significantly increased Zn uptake only in genotypes that had a low Zn uptake in the nonmycorrhizal condition. We conclude that genotypes that are less efficient in Zn uptake when nonmycorrhizal are more responsive to AMF inoculation. We provide examples from literature allowing generalization of this conclusion on a trade off between mycorrhizal responsiveness and nutrient uptake efficiency.

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“…Recently, involvement of a rhizosphere process in tolerance of aerobic rice to low Zn availability was suggested (Gao et al, 2005). Rhizosphere processes could significantly affect Zn bioavailability to rice (Kirk and Bajita, 1995).…”

Section: Introductionmentioning

confidence: 99%

Organic Anion Exudation by Lowland Rice (Oryza sativa L.) at Zinc and Phosphorus Deficiency

2006

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The objectives of this paper were to determine (1) if lowland rice (Oryza sativa L.) plants respond similarly to low zinc (Zn) and phosphorus (P) availability by increased root exudation of low-molecular weight organic anions (LMWOAs) and (2) if genotypic variation in tolerance to low soil supply of either Zn or P is related to LMWOA exudation rates. Exudation of LMWOAs can increase bioavailability of both Zn and P to the plant, through partly similar chemical mechanisms. We used seven lowland rice genotypes and showed in two experiments that genotypes that grow relatively well on a soil with low Zn availability also grow well on a sparingly soluble Ca-phosphate (r=0.80, P=0.03). We measured exudation rates of LMWOAs on nutrient solution and found that both Zn and P deficiency induced significant increases. Among the LMWOAs detected oxalate was quantitatively the most important, but citrate is considered more effective in mobilizing Zn. Citrate exudation rates correlated with tolerance to low soil levels of Zn (P=0.05) and P (P=0.07). In a low-Zn-field we found an increased biomass production at higher plant density, which is supportive for a concentration-dependent rhizosphere effect on Zn bioavailability such as LMWOA exudation. We, for the first time, showed that tolerance to low Zn availability is related to the capacity of a plant to exude LMWOAs and confirmed that exudation of LMWOAs must be regarded a multiple stress response.

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

Cited by 55 publications

References 31 publications

From Flooded to Aerobic Conditions in Rice Cultivation: Consequences for Zinc Uptake

From Flooded to Aerobic Conditions in Rice Cultivation: Consequences for Zinc Uptake

Mycorrhizal responsiveness of aerobic rice genotypes is negatively correlated with their zinc uptake when nonmycorrhizal

Organic Anion Exudation by Lowland Rice (Oryza sativa L.) at Zinc and Phosphorus Deficiency

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