Approaches towards nitrogen- and phosphorus-efficient rice

Vinod, K. K.; Heuer, Sigrid

doi:10.1093/aobpla/pls028

Cited by 86 publications

(68 citation statements)

References 173 publications

(209 reference statements)

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“…QTLs for PUE could be put to use through introgression into elite varieties, although as yet this has hardly been done in breeding programmes (Vinod and Heuer 2012). The QTLs could also be used to identify genes involved in PUE through map-based cloning, although still few QTLs have led to identification of underlying genes.…”

Section: Genetic Factors: Qtlsmentioning

confidence: 99%

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Wiel¹,

Linden²,

Scholten³

2015

Euphytica

193

115

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Phosphorus (P) is often an important limiting factor for crop yields, but rock phosphate as fertilizer is a non-renewable resource and expected to become scarce in the future. High P input levels in agriculture have led to environmental problems. One of the ways to tackle these issues simultaneously is improving phosphorus use efficiency (PUE) of the crops through breeding. In this review, we describe plant architectural and physiological traits important for PUE. Subsequently, we discuss efficient methods of screening for PUE traits. We address targeted cultivation methods, including solid and hydroponic systems, as well as testing methods, such as image analysis systems, and biomass and photosynthesis measurements. Genetic variation for PUE traits has been assessed in many crops, and genetics of PUE has been studied by quantitative trait loci (QTL) analyses and genome-wide association study. A number of genes involved in the plant's response to low P have been characterized. These genes include transcription factors, and genes involved in signal transduction, hormonal pathways, sugar signalling, P saving metabolic pathways, and in P scavenging, including transporters and metabolites and/or ATP-ases mobilizing P in the soil. In addition, the role of microorganisms promoting PUE of plants, particularly arbuscular mycorrhizal fungi is discussed. An overview is given of methods for selecting for optimal combinations of plant and fungal genotypes, and their genetics, incl. QTLs and genes involved. In conclusion, significant progress has been made in selecting for traits for PUE, developing systems for the difficult but highly relevant root phenotyping, and in identifying QTLs and genes involved.

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Section: Genetic Factors: Qtlsmentioning

confidence: 99%

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Wiel¹,

Linden²,

Scholten³

2015

Euphytica

193

115

View full text Add to dashboard Cite

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“…Spatial NO 3 -N reductions recorded in PFs were significantly higher (p = 0.027) in the RS than in the NRS. The increased NO 3 -N reduction in the RS is likely due to increased denitrification rates (plus rice plant N uptake) because of increased ponding depths (Matsuno et al, 2006), increased summer temperatures (Vinod and Heuer, 2012) and application of N fertilisers in the RS (Wang et al, 1993).…”

Section: Temporal and Spatial No 3 -N Reductions In Wetlandsmentioning

confidence: 99%

Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds

Mabaya

Unami

Takeuchi

et al. 2017

IJISD

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Abstract:In Japanese hilly agricultural watersheds, green tea is a profitable crop, whereas paddy rice cannot endure without subsidies. Environmentally, green tea plantations are the highest nitrate pollutant emitters to water bodies, whereas paddy fields are the most significant nitrogen sinks. This study investigates the effectiveness of diverting nitrate-contaminated drainage water from upland tea fields to the lowland paddy fields, in terms of reduction of downstream pollution and rice production cost, using the robust optimal model. The model optimally maximises diversions to reduce nitrate pollution to the adjacent rivers, and is environment risk averse to possible malfunctioning denitrification processes in the respective paddy fields. The application shows increased diversions to paddy fields during the rice growing season, thereby facilitating rice plants to have optimal access to substantial amounts of nitrogen nutrients and water. Thus, the robust optimal model has the potential to support sustainable joint production of the two crops.Keywords: robust optimisation; sustainable production; green tea; paddy rice; agricultural drainage water; nitrogen pollutants.Reference to this paper should be made as follows: Mabaya, G., Unami, K., Takeuchi, J., Fujihara, M. and Yoshioka, H. (2017) 'Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds ', Int. J. Innovation and Sustainable Development, Vol. 11, No. 1, 70 G. Mabaya et al.Biographical notes: Goden Mabaya, MSc (Water Science and Engineering) 2012 UNESCO-IHE, Netherlands, is a PhD student in Water Resources Engineering at the Graduate School of Agriculture, Kyoto University, Japan. He has an extensive technical experience in planning, designing, construction and water management of multiuser irrigation and drainage systems in Africa. His research interests are robust optimisation of integrated agricultural watershed management with an emphasis on environmental sustainability, environmental water quality management, and post-modernisation of irrigation and drainage systems.Koichi Unami, PhD (Agriculture) 1998, Kyoto University, is an Associate Professor at Graduate School of Agriculture, Kyoto University, Japan. His research topics include theories and practices of water resources and environment management in rural areas, with specific emphasis on robustness in decision-making under uncertainty. For example, he determines operation rules for irrigation dams with irregular occurrence of recharge events in the framework of stochastic control. He is also an expert in field studies with different agro-ecological climates in Asia and Africa, such as Lake Biwa Basin of Japan and Volta Basin of West Africa.Junichiro Takeuchi, PhD (Agriculture) 2010, Kyoto University, is an Assistant Professor of Water Resources Engineering at Graduate School of Agriculture, Kyoto University, Japan. His main research interests include fluid flow and solute/energy transport through porous media and environmentally so...

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“…Further increase in rice production may be achieved by intensification or promotion to regions with lower or higher temperatures, and areas with salinized or flooded soils [11][12][13]. Climatic changes will cause increase in average temperatures by the mid-21st century.…”

Section: Introductionmentioning

confidence: 99%

APPLICATION OF MULTIDIMENSIONAL METHODS TO SEPARATE VARIETIES ON their response TO ENVIRONMENT FACTORS

Kharitonov¹,

Goncharova²,

Ochkas³

et al. 2017

S-h. biol.

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A b s t r a c tTill now, the areas under rice crops are mostly occupied with the limited number of varieties. For enriching genetic biodiversity, it is necessary to improve selection of unique rice genotypes, and provide ecologically-based location of each variety. Now the efficiency of breeding is decreasing because of incomplete characterization of potentially donor genotypes. Presently, the domestic standards for competitive state trail do not cover a detailed study of the samples, since the developed varieties are tested at a single level of mineral nutrients with no estimation of a response to stressful influences and yield production sustainability. That leads to rejection of those highly productive samples for which such conditions are not optimal. In the present work we firstly summarized methods to comprehensively characterize adaptive plasticity of rice plants under contrast conditions (i.e. different dates for planting, various levels of mineral nutrition and stressors). In a multifactorial experiment with 19 combinations of the factors tested, we investigated yield variability in 24 Russian rice (Oryza sativa L.) varieties. The samples were planted on April 15, May 15, or June 15 and grown at optimum (N 120 P 60 K 60 ) and excess (N 240 P 120 K 120 ) fertilizer rates, in thin and dense crops (200 or 300 plants per square meter, respectively), under artificial salinization (0.35 % NaCl added to the soil at tillering). The data were processed using cluster and discriminant analysis. The multidimensional statistical methods allow us to clasterize the varieties into four groups with the closest characteristics as influenced by the full set of studied factors, and then to allocate distinct factors for the most precise discrimination between the samples. A standard cultivation was found to be less effective for developing plant plasticity. It is more correct to compare samples when the conditions are favorable for plant performance and productivity potential. Stresses, in combination with favorable factors, contribute to an increase in trait variability and dispersion, resulting in more accurate dividing varieties into groups. In our case study, with the use of «step-by-step analysis back» module we reduced the number of discriminating factors to two ones adequate for 100 % reliable allocation of typical representatives of the groups. High mineral levels and water deficit were enough to truly classify 88 % of the samples. This is sufficient in genetic research where it is necessary to select the most typical representatives. Samples of the groups 1 and 3 have been classified correctly, and only three varieties of the group 2 have got to another cluster. The discriminant analysis also shows distance of each variety from the center of the group. Samples with the minimum distance are the most typical representatives which can be used as genetic sources of desired traits, as contrast parental forms in hybridization, or involved in marker-assisted selection and GTL mapping. Early planting, dense crops, high fer...

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Approaches towards nitrogen- and phosphorus-efficient rice

Abstract: Crop tolerance to lowered availability of nutrients is a major breeding objective in rice. Current understanding of complex genetic control of N and P utilisation is being converged towards precision breeding such as marker assisted breeding for nutrient efficient varieties.

Cited by 86 publications

References 173 publications

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds

APPLICATION OF MULTIDIMENSIONAL METHODS TO SEPARATE VARIETIES ON their response TO ENVIRONMENT FACTORS

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