Development of introgression lines of an Indica-type rice variety, IR64, for unique agronomic traits and detection of the responsible chromosomal regions

Fujita, Daisuke; Santos, Rizza E.; Ebron, Leodegario A.; Telebanco‐Yanoria, Mary Jeanie; Katô, Hiroshi; Kobayashi, Sohei; Uga, Yusaku; Araki, Etsuko; Takai, Toshiyuki; Tsunematsu, Hiroshi; Imbe, Tokio; Khush, G. S.; Brar, D. S.; Fukuta, Yoshimichi; Kobayashi, Nobuya

doi:10.1016/j.fcr.2009.08.004

Cited by 48 publications

(76 citation statements)

References 35 publications

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“…To exploit genes for complex traits, trait-specific ILs that have been developed through backcross breeding with phenotypic selection offer a powerful approach (27). In our previous study, genetic factors underlying grain yield were effectively detected by using trait-specific ILs with an IR64 genetic background in a new approach that combines breeding selection with genetic analysis (21). The 334 ILs with high yield potential had been selected from backcrossed populations and had a few segments introgressed from NPT sources.…”

Section: Discussionmentioning

confidence: 99%

“…All plants were grown in a field at IRRI, Los Baños, Laguna, the Philippines, and evaluated for 1,000-grain weight, PN, FLW, and TSN at maturity as described (21). The panicle rachis was sectioned at 1 cm below the neck, and VBN were counted under a stereomicroscope.…”

Section: Development Of Irri146-spikementioning

confidence: 99%

“…Through backcross breeding, we developed 334 BC 3 -derived ILs, which have variation in agronomic traits inherited from NPT cultivars, in the genetic background of indica cultivar IR64 (21). We selected an IL with high TSN: YTH326 (IR84640-11-110-6-4-2-2-4-2-2-3-B), derived from NPT cultivar YP9 (IR68522-10-2-2), which was derived from a cross between indica cultivar Shennung 89-366 and tropical japonica landrace Daringan (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…These results indicate finding of SPIKE will be extremely valuable for contributing to increase grain production of indica rice cultivars. traits, were selected by field observation (21). Using the ILs, we identified 21 QTLs for yield components such as total spikelet number per panicle (TSN), grain weight, and panicle number.…”

Section: Significancementioning

confidence: 99%

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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.

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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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Section: Discussionmentioning

confidence: 99%

Section: Development Of Irri146-spikementioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Significancementioning

confidence: 99%

See 2 more Smart Citations

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.

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273

253

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“…In rice, a longer duration of vegetative growth often increases biomass and grain yield (Thomson et al 2003, Fujita et al 2009). We found that DTH was positively correlated with CL, CLW and FLL, and negatively correlated with PW and PW/CLW, suggesting the presence of genes that confer short DTH and high PW simultaneously in NERICA10.…”

Section: Co-localization Of Qtls For Agronomic Traitsmentioning

confidence: 99%

Identification of QTLs for Agronomic Characteristics in An Upland New Rice for Africa (NERICA) Variety

Koide

Obara

Yanagihara

et al. 2018

JARQ

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New Rice for Africa (NERICA) varieties have been developed by inter-specific crossings to produce rice suitable for the harsh environments in Africa. The basic idea of NERICA was to combine the most useful characteristics of an African species (Oryza glaberrima) and an Asian species (Oryza sativa). However, the genetic basis of the agronomic characteristics of NERICA varieties remains unknown. In a previous study, we detected QTLs for days to heading (DTH) by using a segregating population derived from a cross between NERICA10 and its parent variety of O. sativa (WAB56-104). In the present study, we evaluated the agronomic traits of the same population and found positive correlations between DTH and culm length, culm and leaf weight, and flag leaf length. Negative correlations were found between DTH and panicle weight (PW), and between the ratio of panicle weight per culm and leaf weight. In the QTL analysis, a total of 33 SSR markers showed significant association with more than one trait and some markers were associated with more than two traits, suggesting the presence of a QTL with pleiotropic effects on multiple traits or a cluster of QTLs controlling different traits. QTLs on chromosome 8 conferred shorter DTH and larger PW in NERICA10 than WAB56-104. This QTL might explain the negative correlation between DTH and PW in the population. This information on the QTLs of agronomic traits will be useful for improving NERICA varieties adapted to low-yielding environments in Africa.

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Diversity of Panicle Architecture and Traits Influencing Grain Filling

Mohapatra

Sahu

2021

Panicle Architecture of Rice and Its Relationship With Grain Filling

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In the long history of domestication through cultivation and selection under diverse habitats; the plant acquired adaptability for growth matching with the physico-chemical behavior of the environment, which is most prominently reflected in the phenology of panicle. Panicle morphology varies significantly more than any other phenotypic attribute of the plant and it is both cultivar and environmentspecific. The architectural traits, including branching, panicle length, and spikelet number, are established during the reproductive phase from panicle initiation to heading depending on activities rachis and branch meristems. Termination of rachis meristem activity fixes primary branch number, whereas, the transition of the primary or secondary meristem into spikelet limits spikelet number; the earlier the closure of the events less are the numbers. Many genes, either small effects or major effects, have been identified that are associated with panicle architecture and grain yield. They are distributed across the 12 rice chromosomes.

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Development of introgression lines of an Indica-type rice variety, IR64, for unique agronomic traits and detection of the responsible chromosomal regions

Cited by 48 publications

References 35 publications

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

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

Identification of QTLs for Agronomic Characteristics in An Upland New Rice for Africa (NERICA) Variety

Diversity of Panicle Architecture and Traits Influencing Grain Filling

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