1
|
Kausch AP, Tilelli M, Hague J, Heffelfinger C, Cunha D, Moreno M, Dellaporta SL, Nelson K. In situ embryo rescue for generation of wide intra- and interspecific hybrids of Panicum virgatum L. PLANT BIOTECHNOLOGY JOURNAL 2016; 14:2168-2175. [PMID: 27154282 PMCID: PMC5095774 DOI: 10.1111/pbi.12573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 04/25/2016] [Accepted: 04/29/2016] [Indexed: 06/05/2023]
Abstract
Wide crosses have been used for decades as a method for transferring novel genetic material and traits in plant breeding. Historically, many products of wide crosses require tedious and inefficient surgical embryo rescue prior to embryo abortion to recover single plantlets. We have utilized transgenic switchgrass (Panicum virgatum L. cv Alamo) as a pollen donor in conjunction with antibiotic or herbicide selection for recovery of intra-and interspecific F1 crosses by using developing ovules from the female parent and selecting for embryogenic cultures derived from the in situ immature embryo. Using this approach, several intravarietial crosses were generated between transgenic Alamo and the switchgrass varieties Kanlow, Blackwell and Cave-in-Rock as well as an interspecific cross with Atlantic coastal panicgrass. This procedure selected F1 embryogenic callus produced from the developing embryo contained within isolated immature ovules. Several clonal plants were successfully regenerated from each cross. Southern blot, PCR, phenotypic analyses and genomic analysis confirmed F1 hybrids. Using genotyping-by-sequencing shows the hybridization of the recovered plants by determining the ratio of transgressive markers to total compared markers between parents and their potential offspring. The ratio of transgressive markers to total compared markers was significantly lower between parents and their predicted offspring than between parents and offspring unrelated to them. This approach provides the possibility to move useful transgenes into varieties that are recalcitrant to direct transformation which can be optionally segregated thus useful to create new hybrids, as well as recovery of wide crosses that are either difficult or impossible using traditional techniques.
Collapse
Affiliation(s)
- Albert P Kausch
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, USA.
| | - Michael Tilelli
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, USA
| | - Joel Hague
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, USA
| | - Christopher Heffelfinger
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - David Cunha
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, USA
| | - Maria Moreno
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Stephen L Dellaporta
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Kimberly Nelson
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, USA
| |
Collapse
|
2
|
Lombardo L. Genetic use restriction technologies: a review. PLANT BIOTECHNOLOGY JOURNAL 2014; 12:995-1005. [PMID: 25185773 DOI: 10.1111/pbi.12242] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Revised: 07/16/2014] [Accepted: 07/17/2014] [Indexed: 05/23/2023]
Abstract
Genetic use restriction technologies (GURTs), developed to secure return on investments through protection of plant varieties, are among the most controversial and opposed genetic engineering biotechnologies as they are perceived as a tool to force farmers to depend on multinational corporations' seed monopolies. In this work, the currently proposed strategies are described and compared with some of the principal techniques implemented for preventing transgene flow and/or seed saving, with a simultaneous analysis of the future perspectives of GURTs taking into account potential benefits, possible impacts on farmers and local plant genetic resources (PGR), hypothetical negative environmental issues and ethical concerns related to intellectual property that have led to the ban of this technology.
Collapse
Affiliation(s)
- Luca Lombardo
- Department of Crop Systems, Forestry and Environmental Sciences, University of Basilicata, Potenza, Italy
| |
Collapse
|