Northern Wild Rice (Zizania palustris L.) breeding, genetics, and conservation

Lillian H McGilp, Claudia Castell-Miller, Matthew W Haas, Reneth A Millas, Jennifer Kimball

Research output: Contribution to journalReview articlepeer-review

1 Scopus citations

Abstract

Cultivated Northern Wild Rice (NWR; Zizania palustris L.) is a high-value, small commodity crop grown in irrigated paddies, primarily in Minnesota and California. Domestication of the species began ∼60 years ago as demand for the nutritional grain outpaced hand-harvesting efforts from lakes and rivers in the Great Lakes region of the United States and Canada. Cultivated NWR cultivars are open-pollinated and highly heterogeneous and have primarily been bred for seed retention, yield, and seed size. As a lowland crop, NWR's life cycle, particularly its unique seed physiology, poses challenges to breeding efforts, limiting selection cycles per year, and requiring annual grow-outs of all germplasm. Recent efforts have increased the genomic resources available to NWR researchers, including a reference genome assembly and methodology optimization for genotyping-by-sequencing technologies. The species’ close phylogenetic relationship with white rice (Oryza sativa) also provides a unique opportunity to utilize comparative genomic approaches to identify genes conferring agronomic traits of interest in NWR, particularly domestication traits such as seed retention. Z. palustris is an enigmatic species with regional ecological, cultural, and agricultural significance in the Great Lakes. As NWR is grown in both the centers of origin and diversity, it is important for NWR plant breeders to be good stewards of our domesticated plants and include a diversity of stakeholders in our decision-making processes. In this work, we have aimed to unpack some of the disputes regarding the breeding of cultivated NWR and the science behind our work. Additionally, we have discussed conservation efforts for natural stands of NWR which will help preserve the many ecosystem, nutritional, spiritual, and economic services provided by this important species.

Original languageEnglish (US)
Pages (from-to)1904-1933
Number of pages30
JournalCrop Science
Volume63
Issue number4
DOIs
StatePublished - Jul 1 2023

Bibliographical note

Funding Information:
The authors would like to thank David Beadle for the use of his rice worm moth photo and Alan Mickelson for the use of his rice worm larvae photo in our manuscript.

Publisher Copyright:
© 2023 The Authors. Crop Science © 2023 Crop Science Society of America.

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