Reproductive Isolation Between indica and japonica Subspecies

Ouyang, Yidan

doi:10.1007/978-1-4614-7903-1_21

Cited by 2 publications

(1 citation statement)

References 83 publications

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“…Almost half of the pigmented rice accessions retrieved from the PhilRice Genebank represented near-identical genotypes, a common phenomenon among genebank collections (Moura et al 2013; Virk et al 1995; Zhou et al 2015). Multiple analytical approaches consistently divided the accessions into two major groups, indica and japonica , with considerable genetic differentiation ( F ST = 0.50) reflecting the distinctiveness and barriers to crossing that normally prevents gene flow between these two sub-species (Ouyang 2013). A few admix accessions were observed, although several of these accessions displayed a high degree of heterozygosity, unusual for a typically inbreeding species like rice.…”

Section: Discussionmentioning

confidence: 99%

Exploring the genetic diversity within traditional Philippine pigmented Rice

Mbanjo

Jones

Caguiat

et al. 2019

Rice

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Background The wild ancestors of domesticated rice had red seed, white rice being the result of a mutation in the rice domestication gene Rc . Many pigmented rice landraces are still grown by ethnic communities for their nutritional and cultural value. This study assesses the genetic diversity in a collection of pigmented rice accessions from the Philippines. Results We undertook an analysis of the genetic and colour variation in a collection of 696 pigmented rice accessions held at PhilRice in the Philippines. The collection was reduced to 589 genotypes after removal of accessions with limited passport data or with low SNP marker call rates. Removal of duplicate genotypes resulted in a final, core collection of 307 accessions, representing all administrative districts of the Philippines, and composed predominately of japonica and indica sub-species. No genetic structure was observed in the core collection based on geographic origin. A pairwise comparison of accessions by region indicating that both local and long-distance exchange of rice accessions had occurred. The majority of the genetic variation was within regions (82.38%), rather than between regions (10.23%), with the remaining variation being within rice accession variance (7.39%). The most genetically diverse rice accessions originated from the Cordillera Administrative Region (CAR) in the far north of the Philippines, and in the regions of Davao and Caraga in the southeast. A comparison with pigmented rice accessions from the neighbouring countries Taiwan, Laos, China and India revealed a close relationship between accessions from Taiwan, supporting the hypothesis of southward diffusion of Austronesians from Taiwan to the Philippine. The 14-bp deletion within the gene Rc , known to result in loss of red pigmentation, was found in 30 accessions that still had coloured pericarps. Multi-spectral phenotyping was used to measure seed geometric and colour-appearance traits in 197 accessions from the core collection. The purple and variable purple rice accessions had the lowest values for the seed colour parameters - lightness (L*), intensity, saturation, a* (green – red; redness) and b* (blue – yellow; yellowness). Conclusion These pigmented rice accessions represent a diverse genetic resource of value for further study and nutritional improvement of commercial rice varieties. Electronic supplementary material The online version of this article (10.1186/s12284-019-0281-2) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Exploring the genetic diversity within traditional Philippine pigmented Rice

Mbanjo

Jones

Caguiat

et al. 2019

Rice

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Population Dynamics of Wide Compatibility System and Evaluation of Intersubspecific Hybrids by indica-japonica Hybridization in Rice

Kallugudi

Singh

Vinod

et al. 2022

Plants

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The exploitation of heterosis through intersubspecific hybridisation between indica and japonica has been a major breeding target in rice, but is marred by the cross incompatibility between the genomes. Wide compatibility (WC) is a triallelic system at the S5 locus on chromosome 6 that ensures the specificity of hybridisation within and between indica and japonica. The S5n allele that favours intercrossing is sparsely distributed in the rice gene pool and therefore warrants identification of diverse WC sources to develop superior intersubspecific hybrids. In this study, we have identified several novel WC sources through the marker-assisted screening of a large set of 950 rice genotypes. Seventeen percent of the genotypes carried S5n, which fell into two subpopulations. The WC genotypes showed wide phenotypic and genotypic variability, including both indica and japonica lines. Based on phenotypic performance, the WC varieties were grouped into three clusters. A subset of 41 WC varieties was used to develop 164 hybrids, of which WC/japonica hybrids showed relative superiority over WC/indica hybrids. The multilocation evaluation of hybrids indicated that hybrids derived from WC varieties, such as IRG137, IRG143, OYR128, and IRGC10658, were higher yielding across all the three different locations. Most of the hybrids showed the stability of performance across locations. The identified diverse set of wide compatible varieties (WCVs) can be used in the development of intersubspecific hybrids and also for parental line development in hybrid rice breeding.

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Reproductive Isolation Between indica and japonica Subspecies

Cited by 2 publications

References 83 publications

Exploring the genetic diversity within traditional Philippine pigmented Rice

Exploring the genetic diversity within traditional Philippine pigmented Rice

Population Dynamics of Wide Compatibility System and Evaluation of Intersubspecific Hybrids by indica-japonica Hybridization in Rice

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