The role of tolerant genotypes and plant nutrients in the management of iron toxicity in lowland rice

Sahrawat, K. L.; Mulbah, C. K.; Diatta, S.; DeLaune, R. D.; Patrick, W. H.; Singh, B. N.; Jones, M. P.

doi:10.1017/s002185960007307x

Cited by 67 publications

(70 citation statements)

References 8 publications

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“…Generally, soils with pH below 5.0 were prone to Fe toxicity 11 . The critical limit was about 100 mg L -1 at pH 3.7 and 300 mg L -1 or higher at pH 5.0 24,27 . In the current experiment at Iloilo, the concentrations of Fe in soil solution ranged from 40 to 140 mg L -1 throughout the growth period (Fig.…”

Section: Resultsmentioning

confidence: 91%

“…However, Sahrawat 27 showed the presence of Fe toxicity without any apparent deficiency of other nutrients. For both Fe-tolerant and susceptible cultivars in his experiment, there were no differences in the P and K concentrations in shoot except for that of Fe.…”

Section: Resultsmentioning

confidence: 99%

“…Those high concentrations of iron oxide under low soil pH and Fe in leaf support the expression of Fe-toxicity at Iloilo. Genetic characteristics were reported to be able to significantly improve rice production in Fe toxic soils 12,27 . The periods of elite breeding lines for maturity and flowering were more than 10 days longer than those of IR64 and its NILs irrespective of the fields (Table 2).…”

Section: Resultsmentioning

confidence: 99%

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Characteristics of Iron Tolerant Rice Lines Developed at IRRI under Field Conditions

Nozoe

Agbisit

Fukuta

et al. 2008

JARQ

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In the 2003 wet season, IR64 (check variety) and four lines of rice (Oryza sativa L.) developed at IRRI were cultivated in a field with iron (Fe) toxicity at Iloilo City, Philippines, and also under normal soil conditions at IRRI farm. Two of the lines used in the experiments were the near isogenic lines (NILs) of IR64, selected as Fe-tolerant lines in solution culture in the greenhouse. The other two lines were elite breeding lines that were selected as Fe-tolerant lines in the field trial at Iloilo. The tolerances of NILs were not expressed at the Iloilo field site because the yield reductions due to Fe-toxicity were similar to or larger than those for IR64. The yield reduction of elite breeding lines was smaller than that of IR64, indicating that the tolerance of elite breeding lines was expressed at the Iloilo field. At Iloilo, the shoot dry weights of IR64 and its NILs hardly increased after 73 days of cultivation. On the contrary, those of elite breeding lines kept on increasing. While the root dry weight of IR64 and its NILs decreased abruptly after 50 days of growth, those of elite breeding lines remained constant or decreased gradually. This finding suggests that one of the factors that suppressed the growth of IR64 and its NILs during the late stage was early root senescence. Since the tolerance of elite breeding lines was associated with the maintenance of root activity during the late stage of growth, the long maturity period of elite breeding lines presumably helped to alleviate the toxicity.Discipline: Soil, fertilizers and plant nutrition Additional key words: Fe-tolerance, Fe-toxicity, paddy soil, root JARQ 42 (3), 187 -192 (2008) http://www.jircas.affrc.go.jp This study was supported by the IRRI-Japan collaborative research project phase IV (1999IV ( -2004.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Characteristics of Iron Tolerant Rice Lines Developed at IRRI under Field Conditions

Nozoe

Agbisit

Fukuta

et al. 2008

JARQ

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“…Plants grown under flooded conditions accumulate high levels of Fe (Yamaguchi, 1989 ;Sahrawat et al, 1996). During exposure of flooded plants to O #, oxidation of Fe(II) leads to production of O # d − which is suggested as a cause of flooding damage to plants (Hendry & Brocklebank, 1985 ;Hendry, 1993 ;Neue et al, 1998).…”

Section: Superoxide-generating Nadph Oxidasementioning

confidence: 99%

Tansley Review No. 111

2000

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Zinc deficiency is one of the most widespread micronutrient deficiencies in plants and causes severe reductions in crop production. There are a number of physiological impairments in Zn-deficient cells causing inhibition of the growth, differentiation and development of plants. Increasing evidence indicates that oxidative damage to critical cell compounds resulting from attack by reactive O # species (ROS) is the basis of disturbances in plant growth caused by Zn deficiency. Zinc interferes with membrane-bound NADPH oxidase producing ROS. In Zn-deficient plants the iron concentration increases, which potentiates the production of free radicals. The Zn nutritional status of plants influences photooxidative damage to chloroplasts, catalysed by ROS. Zinc-deficient leaves are highly light-sensitive, rapidly becoming chlorotic and necrotic when exposed to high light intensity. Zinc plays critical roles in the defence system of cells against ROS, and thus represents an excellent protective agent against the oxidation of several vital cell components such as membrane lipids and proteins, chlorophyll, SH-containing enzymes and DNA. The cysteine, histidine and glutamate or aspartate residues represent the most critical Znbinding sites in enzymes, DNA-binding proteins (Zn-finger proteins) and membrane proteins. In addition, animal studies have shown that Zn is involved in inhibition of apoptosis (programmed cell death) which is preceded by DNA and membrane damage through reactions with ROS.

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“…Iron toxicity symptoms in rice plants have been widely documented in the West African lowlands 7,53 . Sulfur and Zn deficiencies in rice as well as limited availability of P, K, Ca, and Mg in soils may stimulate symptoms of iron toxicity 37,38,57,58 . Iron toxicity can be alleviated by the application of potassium sulfate, the introduction of tolerant genotypes, the adoption of a ridge culture, and the improvement of soil drainage 7,56,58 .…”

Section: Sulfur and Micro-nutrient Statusmentioning

confidence: 99%

Soil Fertility Potential for Rice Production in West African Lowlands

Abe

Buri²,

Issaka³

et al. 2010

JARQ

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In this paper, we review the soil fertility characteristics and the nature of material in the West African lowlands in comparison with paddy soils in tropical Asia to examine their potential for rice cultivation. Soil samples collected from major lowland ecosystems, i.e., inland valleys (185 locations) and flood plains (62 locations), in 13 countries (Benin, Burkina Faso, Cameroon, Cote d'Ivoire, Ghana, Guinea, Niger, Nigeria, Liberia, Mali, Senegal, Sierra Leone, and Togo) generally show low values of pH, total C and N, available (Bary-2) P, exchangeable Ca and Mg, effective cation exchange capacity (ECEC), and clay content. These properties of the 87 topsoil samples selected from 247 collected samples are well associated with mineralogical composition. The clay and primary minerals predominantly consist of kaolinite and quartz, respectively, which suggests that the lowland soils in the region have low nutrient-holding capacity and a limited potential for inherent nutrient supply. In general, soil pH, available P, exchangeable bases (Ca, Mg, K, and Na), and ECEC decrease while total C, total N and exchange acidity (Al and H) increase with increasing rainfall. This tendency is mostly explained by the enhanced biomass production and soil weathering sequence governed by the climate. In terms of rice production, the lowland soils in West Africa have lower values of general fertility parameters and poorer mineralogical characteristics compared to paddy soils in tropical Asia, which includes Bangladesh, Cambodia, India, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka, and Thailand. In addition, deficit levels of S and Zn for rice production are widely observed in the lowland soils in West Africa. These findings suggest that soil fertility characteristics show substantially less potential for rice production in West Africa than in tropical Asia.Discipline: Soils, fertilizers and plant nutrition Additional key words: agro-ecological zones, flood plains, inland valleys, mineralogical composition, sulfur and zinc deficiencyThe present paper is a joint contribution from the projects 'Development of Sustainable Rice Farming Systems in Low Activity Clay

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The role of tolerant genotypes and plant nutrients in the management of iron toxicity in lowland rice

Cited by 67 publications

References 8 publications

Characteristics of Iron Tolerant Rice Lines Developed at IRRI under Field Conditions

Characteristics of Iron Tolerant Rice Lines Developed at IRRI under Field Conditions

Tansley Review No. 111

Soil Fertility Potential for Rice Production in West African Lowlands

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