Insights into the genetic spatial structure of Nicaraguan weedy rice and control of its seed spread

Wei-Chun Hsu; Dong-Hong Wu; Szu-Wu Chen; Sergio Antonio Cuadra Castillo; Sih-Dun Huang; Charng-Pei Li; Yun-Ping Wang

doi:10.1002/ps.7011

Insights into the genetic spatial structure of Nicaraguan weedy rice and control of its seed spread

Resource

MOFA-iceal-10902

Ministry of Science and Technology, Taiwan 108-2628-B-055-001

Ministry of Science and Technology, Taiwan 109-2628-B-055-001

Journal

Pest management Science

Journal Volume

78

Journal Issue

8

Pages

3685-3696

Date Issued

2022-06

Author(s)

Wei-Chun Hsu

Dong-Hong Wu

Szu-Wu Chen

Sergio Antonio Cuadra Castillo

Sih-Dun Huang

Charng-Pei Li

Yun-Ping Wang

DOI

10.1002/ps.7011

URI

https://onlinelibrary.wiley.com/doi/10.1002/ps.7011

https://scholars.tari.gov.tw/handle/123456789/17496

Abstract

BACKGROUND The genetic backgrounds and occurrence patterns of weedy rice (WR, Oryza sativa) are highly diverse, and so are the challenges facing its control among countries. WR control is difficult because it is similar to cultivated rice and manual removal is one of the few options for control. Understanding the ecology of WR will aid efforts to break its life cycle and establish long-term management strategies under both irrigated and rainfed systems. RESULTS Nicaraguan WR (NWR) plants were genetically closer to the AUS and Indica pools in terms of to genetic distance. A map of admixture coefficients suggested a pattern of long-distance dispersal and spread of NWR across Nicaragua, which has likely been facilitated by commercial activities and sharing of harvesting equipment between border cities or important trading ports and inland regions. Moreover, the NWR plants from the soil seedbank in irrigated regions showed different habitats and lower grain number per panicle compared with plants spread by seed-mediated contamination. In addition, grain indexes showed that length-to-width ratio was a better indicator than awn length for distinguishing between NWR and Nicaraguan Indica cultivars. CONCLUSION Analysis of the population structure and habitats of NWR revealed five clusters derived from seed-mediated contamination in rainfed upland regions, plants from the soil seedbank in irrigated double-cropping regions, and pollen-mediated contamination across both regions. Field weed management before harvesting and seed purification based on the length-to-width ratio can be conducted to improve the efficiency of long-term control of WR in Nicaragua.

Subjects

weedy rice

genetic diversity

population structure

weed management

Publisher

John Wiley & Sons Ltd.

Type

journal article