Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.)
Various adaptive mechanisms can ensure that seedlings are established at the most favourable time and place. These mechanisms include seed dormancy i.e., incapacity to germinate in any environment without a specific environmental trigger and inhibition i.e., incapacity to germinate in an unfavourabl...
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Frontiers Media S.A.
2022-01-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2021.794488/full |
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| author | Wagdi Ghaleb Wagdi Ghaleb Philippe Barre Béatrice Teulat Lina Qadir Ahmed Abraham J. Escobar-Gutiérrez |
| author_facet | Wagdi Ghaleb Wagdi Ghaleb Philippe Barre Béatrice Teulat Lina Qadir Ahmed Abraham J. Escobar-Gutiérrez |
| author_sort | Wagdi Ghaleb |
| collection | DOAJ |
| description | Various adaptive mechanisms can ensure that seedlings are established at the most favourable time and place. These mechanisms include seed dormancy i.e., incapacity to germinate in any environment without a specific environmental trigger and inhibition i.e., incapacity to germinate in an unfavourable environment (water availability, temperature: thermoinhibition and light). The objective of this research was to study in the temperate range for germination of forage and turf grass species perennial ryegrass, if the thermal requirements for germination are under genetic controlled and could be selectively bred. Two divergent selections of three cycles were realized on a natural population: one to select for the capacity to germinate at 10°C vs. the impossibility to germinate at 10°C, and one to select for the capacity to germinate at 32°C vs. the impossibility to germinate at 32°C. Seeds of all the lots obtained from the two divergent selections were then germinated at constant temperatures from 5 to 35°C to evaluate their germination ability. Concerning the positive selection, the first cycle of positive selection at 10°C was highly efficient with a very strong increase in the germination percentage. However, afterward no selection effect was observed during the next two cycles of positive selection. By contrast, the positive selection at 32°C was efficient during all cycles with a linear increase of the percentage of germination at 32°C. Concerning the negative selection, we observed only a large positive effect of the first cycle of selection at 10°C. These findings demonstrate that seed thermoinhibition at 10 and 32°C observed in a natural population of perennial ryegrass has a genetic basis and a single recessive gene seems to be involved at 10°C. |
| first_indexed | 2024-04-11T18:09:15Z |
| format | Article |
| id | doaj.art-eb0671010ea1450cb32d63d7c9b59896 |
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| issn | 1664-462X |
| language | English |
| last_indexed | 2024-04-11T18:09:15Z |
| publishDate | 2022-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-eb0671010ea1450cb32d63d7c9b598962022-12-22T04:10:13ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2022-01-011210.3389/fpls.2021.794488794488Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.)Wagdi Ghaleb0Wagdi Ghaleb1Philippe Barre2Béatrice Teulat3Lina Qadir Ahmed4Abraham J. Escobar-Gutiérrez5INRAE, URP3F, F-86600 Lusignan, FranceBiotechnology Research Center (BTRC), Tripoli, LibyaINRAE, URP3F, F-86600 Lusignan, FranceUniv. Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, F-49000 Angers, FranceINRAE, URP3F, F-86600 Lusignan, FranceINRAE, URP3F, F-86600 Lusignan, FranceVarious adaptive mechanisms can ensure that seedlings are established at the most favourable time and place. These mechanisms include seed dormancy i.e., incapacity to germinate in any environment without a specific environmental trigger and inhibition i.e., incapacity to germinate in an unfavourable environment (water availability, temperature: thermoinhibition and light). The objective of this research was to study in the temperate range for germination of forage and turf grass species perennial ryegrass, if the thermal requirements for germination are under genetic controlled and could be selectively bred. Two divergent selections of three cycles were realized on a natural population: one to select for the capacity to germinate at 10°C vs. the impossibility to germinate at 10°C, and one to select for the capacity to germinate at 32°C vs. the impossibility to germinate at 32°C. Seeds of all the lots obtained from the two divergent selections were then germinated at constant temperatures from 5 to 35°C to evaluate their germination ability. Concerning the positive selection, the first cycle of positive selection at 10°C was highly efficient with a very strong increase in the germination percentage. However, afterward no selection effect was observed during the next two cycles of positive selection. By contrast, the positive selection at 32°C was efficient during all cycles with a linear increase of the percentage of germination at 32°C. Concerning the negative selection, we observed only a large positive effect of the first cycle of selection at 10°C. These findings demonstrate that seed thermoinhibition at 10 and 32°C observed in a natural population of perennial ryegrass has a genetic basis and a single recessive gene seems to be involved at 10°C.https://www.frontiersin.org/articles/10.3389/fpls.2021.794488/fulldivergent selectiongerminationtemperatureperennial ryegrassLolium perenne L.thermoinhibition |
| spellingShingle | Wagdi Ghaleb Wagdi Ghaleb Philippe Barre Béatrice Teulat Lina Qadir Ahmed Abraham J. Escobar-Gutiérrez Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) Frontiers in Plant Science divergent selection germination temperature perennial ryegrass Lolium perenne L. thermoinhibition |
| title | Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) |
| title_full | Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) |
| title_fullStr | Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) |
| title_full_unstemmed | Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) |
| title_short | Divergent Selection for Seed Ability to Germinate at Extreme Temperatures in Perennial Ryegrass (Lolium perenne L.) |
| title_sort | divergent selection for seed ability to germinate at extreme temperatures in perennial ryegrass lolium perenne l |
| topic | divergent selection germination temperature perennial ryegrass Lolium perenne L. thermoinhibition |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2021.794488/full |
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