Pink-awned weedy rice (Oryza sativa): a potential conduit for gene exchange in rice agro-ecosystems

被引：1

作者：

Vigueira, C. C. ^{[1
,2
]}

Burgos, N. R. ^{[3
]}

Lawton-Rauh, A. L. ^{[1
]}

机构：

[1] Clemson Univ, Dept Biochem & Genet, Clemson, SC 29634 USA

[2] High Point Univ, Dept Biol, High Point, NC 27268 USA

[3] Univ Arkansas, Dept Crop Soil & Environm Sci, Fayetteville, AR 72704 USA

来源：

WEED RESEARCH | 2018年 / 58卷 / 05期

关键词：

Oryza sativa subsp; japonica; introgression; adaptation; weedy rice; hybridisation; MULTILOCUS GENOTYPE DATA; RED RICE; POPULATION-STRUCTURE; CLEARFIELD(TM) RICE; STATISTICAL-METHOD; HELIANTHUS-ANNUUS; DNA POLYMORPHISM; OUTCROSSING RATE; CULTIVATED RICE; HYBRIDIZATION;

D O I：

10.1111/wre.12326

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Hybridisation between genetically distinct lineages results in increases in overall genetic diversity and is a potential mechanism for the origin and spread of adaptive alleles. Weed and crop hybridisation may result in weedy ecotypes, which have, in addition to classic weedy traits such as seed shattering and long seed dormancy, crop traits that enhance weediness, such as adaptation to field cultivation and harvest strategies. Weedy rice (Oryza sativa) hybridises with cultivated rice and, in the process, may produce new (pink-awned) weedy rice varieties. Pink-awned (PA) weedy rice plants have been observed in rice fields in Arkansas. We explored the genetic relationships between PA weedy rice, crop rice, global rice accessions and other weedy rice ecotypes present in the southern United States. Gene sequencing of 48 sequence-tagged sites (STS loci) revealed a pattern of hybridisation and gene flow between blackhull weedy rice and tropical japonica rice (O.sativa subsp. japonica) cultivars. Our data suggest that PA rice originates from hybridisation between blackhull weedy rice and tropical japonica rice. PA rice offspring segregate phenotypic traits associated with weediness in rice. This segregation could lead to adaptive allele combinations in PA rice, which could potentially move into other weedy rice types through subsequent hybridisation events.

引用

页码：369 / 378

页数：10

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