Crops that feed the world 7: Rice

Seck, Papa Abdoulaye; Diagne, Aliou; Mohanty, Samarendu; Wopereis, M.C.S.

doi:10.1007/s12571-012-0168-1

Cited by 700 publications

(422 citation statements)

References 27 publications

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“…Rice (Oryza sativa L.) is an important crop worldwide since more than 3.5 billion people depend on it and supplements more than 20% of their daily calories requirement (Seck et al, 2012). Demand for rice has steadily increased with population growth; rice uses one fifth of the area sown with cereals and it is the species with the second largest planted area (Kshirsagar et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity, identification, and certification of Chilean rice varieties using molecular markers

Becerra

Paredes

Gutiérrez

et al. 2015

Chilean J. Agric. Res.

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It takes approximately 14 yr to produce a new rice (Oryza sativa L.) variety, that is, from initial hybridization to its commercial release. Currently, new varieties are identified based on morphological descriptors, which have been efficient over time. However, due to the main constraints on seed type impose to other breeding objectives and the pressure of continuous release of varieties, high degree of parentage, and genetic and morphological uniformity has been observed in the breeding populations. The objectives of this study were: to determine the genetic variability of Chilean and foreign commercial rice varieties, and determine, identify, and certify the genetic relationships among varieties, using simple sequence repeat (SSR) markers. A total of 16 commercial varieties, some of them closely related, were included in the study, which were genetically analyzed using 54 microsatellites. The 54 microsatellite loci allowed the discrimination among the 16 varieties. The number of alleles ranged between 2 and 8 with a mean of 3.54 alleles per locus, while the polymorphism information content (PIC) presented a mean of 0.44. The genetic distance and diversity parameters between pairs of varieties indicate a limited diversity among these genotypes. The cluster analysis indicated that varieties were grouped according to their grain type and pedigree. Results demonstrate that the identification and certification of varieties using microsatellite markers could be a good complement to existing agro-morphological data when varieties are closed related.

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Section: Introductionmentioning

confidence: 99%

Genetic diversity, identification, and certification of Chilean rice varieties using molecular markers

Becerra

Paredes

Gutiérrez

et al. 2015

Chilean J. Agric. Res.

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“…Africa's emergence as a big rice importer is explained by the fact that during the last decade rice has become the most rapidly growing food source in sub-Saharan [5]. Indeed, due to population growth (4% per annum), rising incomes and a shift in consumer preferences in favor of rice, especially in urban areas [6], the relative growth in demand for rice is faster in this region than anywhere in the world [7]. This is occurring throughout the sub regions of sub-Saharan Africa (SSA).…”

Section: Introductionmentioning

confidence: 99%

The influence of price on rice production in Sierra Leone

Conteh¹,

Yan²,

Sankoh³

2012

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Rice is the main staple food of the vast majority of Sierra Leoneans, eaten on a daily basis by almost every household in the country. Rice is the most important food crop widely grown by farmers across the country. Although much attention is now focused on rice production through the small holder commercialization programme (SHCP), less attention has been given to investigating the constraints faced by rice producers in the country. Also, as food insecurity continues to be a major development problem across the country, thereby undermining people's health, productivity, and often their very survival; this study contributes to efforts to overcome the development challenges posed by food insecurity necessarily begin with accurate assessment of influential factors that con-strained the production of the staple food, rice. The main objective of this study is therefore to analysis the factors that influence rice production in the country, and specifically examine the relationship between rice production and the price of rice as sold in the domestic market. The study used a log linear model with the quantity of rice produced as the dependent variable and the price of domestic rice, quantity of rice imported and price of imported rice as explanatory. Findings indicated that, domestic rice is more expensive than imported rice per ton, and this underscores the argument that, rice importation is undermining domestic rice production as a viable income generating activity. Also, almost all the people in the capital city which hosts about 70% of the total population of country prefer eating imported rice, since it is free from stones and other impurities. However, In order to control price and still increase rice production, the government should be able to purchase the rice from the farmers and then sell this rice to private retailers.

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“…Most of this increase will occur in the developing countries of Asia and Africa. By 2035, a 26% increase in rice production will be essential to feed the rising population (1,2). Rice (Oryza sativa L.) is a staple food of more than 3 billion people, mainly in Asia.…”

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confidence: 99%

NAL1 allele from a rice landrace greatly increases yield in modern indica cultivars

Fujita

Trijatmiko

Tagle

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

273

253

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Increasing crop production is essential for securing the future food supply in developing countries in Asia and Africa as economies and populations grow. However, although the Green Revolution led to increased grain production in the 1960s, no major advances have been made in increasing yield potential in rice since then. In this study, we identified a gene, SPIKELET NUMBER (SPIKE), from a tropical japonica rice landrace that enhances the grain productivity of indica cultivars through pleiotropic effects on plant architecture. Map-based cloning revealed that SPIKE was identical to NARROW LEAF1 (NAL1), which has been reported to control vein pattern in leaf. Phenotypic analyses of a near-isogenic line of a popular indica cultivar, IR64, and overexpressor lines revealed increases in spikelet number, leaf size, root system, and the number of vascular bundles, indicating the enhancement of source size and translocation capacity as well as sink size. The near-isogenic line achieved 13-36% yield increase without any negative effect on grain appearance. Expression analysis revealed that the gene was expressed in all cell types: panicles, leaves, roots, and culms supporting the pleiotropic effects on plant architecture. Furthermore, SPIKE increased grain yield by 18% in the recently released indica cultivar IRRI146, and increased spikelet number in the genetic background of other popular indica cultivars. The use of SPIKE in rice breeding could contribute to food security in indica-growing regions such as South and Southeast Asia.qTSN4 | gene validation | pleiotropy | marker-assisted breeding

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Crops that feed the world 7: Rice

Cited by 700 publications

References 27 publications

Genetic diversity, identification, and certification of Chilean rice varieties using molecular markers

Genetic diversity, identification, and certification of Chilean rice varieties using molecular markers

The influence of price on rice production in Sierra Leone

NAL1 allele from a rice landrace greatly increases yield in modern indica cultivars

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