Germination sensitivities to water potential among co - existing C3 and C4 grasses of cool semi-arid prairie grasslands
An untested theory states that C4 grass seeds could germinate under lower water potentials [?] than C3 grass seeds. We used hydrotime modelling to study seed water relations of C4 and C3 Canadian prairie grasses to address ? divergent sensitivities and germination strategies along a risk-spreading c...
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| Formato: | Artículo |
| Lenguaje: | Español |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2015mollard.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 024 | |a 10.1111/plb.12292 | ||
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| 100 | 1 | |9 67146 |a Mollard, Federico Pedro Otto | |
| 245 | 0 | 0 | |a Germination sensitivities to water potential among co - existing C3 and C4 grasses of cool semi-arid prairie grasslands |
| 520 | |a An untested theory states that C4 grass seeds could germinate under lower water potentials [?] than C3 grass seeds. We used hydrotime modelling to study seed water relations of C4 and C3 Canadian prairie grasses to address ? divergent sensitivities and germination strategies along a risk-spreading continuum of responses to limited water. C4 grasses were Bouteloua gracilis, Calamovilfa longifolia and Schizachyrium scoparium; C3 grasses were Bromus carinatus, Elymus trachycaulus, Festuca hallii and Koeleria macrantha. Hydrotime parameters were obtained after incubation of non-dormant seeds under different ? PEG 6000 solutions. A t-test between C3 and C4 grasses did not find statistical differences in population mean base ? [?b[50]]. We found idiosyncratic responses of C4 grasses along the risk-spreading continuum. B. gracilis showed a risk-taker strategy of a species able to quickly germinate in a dry soil due to its low ?b[50] and hydrotime [?H]. The high ?b[50] of S. scoparium indicates it follows the risk-averse strategy so it can only germinate in wet soils. C. longifolia showed an intermediate strategy: the lowest ?b[50] yet the highest ?H. K. macrantha, a C3 grass which thrives in dry habitats, had the highest ?b[50], suggesting a risk-averse strategy for a C3 species. Other C3 species showed intermediate germination patterns in response to ? relative to C4 species. Our results indicate that grasses display germination sensitivities to ? across the risk-spreading continuum of responses. Thus seed water relations may be poor predictors to explain differential recruitment and distribution of C3 and C4 grasses in the Canadian prairies. | ||
| 650 | |2 Agrovoc |9 26 | ||
| 653 | 0 | |a WATER AVAILABILITY | |
| 653 | 0 | |a SOIL WATER AVAILABILITY | |
| 653 | 0 | |a SOIL WATER | |
| 653 | 0 | |a SEMIARID REGION | |
| 653 | 0 | |a SEMI-ARID GRASSLANDS | |
| 653 | 0 | |a SCHIZACHYRIUM SCOPARIUM | |
| 653 | 0 | |a RECRUITMENT [POPULATION DYNAMICS] | |
| 653 | 0 | |a RECRUITMENT | |
| 653 | 0 | |a PRAIRIE | |
| 653 | 0 | |a POACEAE | |
| 653 | 0 | |a KOELERIA MACRANTHA | |
| 653 | 0 | |a GRASS | |
| 653 | 0 | |a GERMINATION ECOLOGY | |
| 653 | 0 | |a GERMINATION | |
| 653 | 0 | |a FESTUCA HALLII | |
| 653 | 0 | |a ELYMUS TRACHYCAULUS | |
| 653 | 0 | |a COEXISTENCE | |
| 653 | 0 | |a CANADA | |
| 653 | 0 | |a CALAMOVILFA LONGIFOLIA | |
| 653 | 0 | |a C4 PLANT | |
| 653 | 0 | |a C4 GRASSES | |
| 653 | 0 | |a C3 PLANT | |
| 653 | 0 | |a C3 GRASSES | |
| 653 | 0 | |a BROMUS CARINATUS | |
| 653 | 0 | |a BOUTELOUA GRACILIS | |
| 700 | 1 | |a Naeth, M. Anne |9 67145 | |
| 773 | |t Plant Biology |g vol.17, no.2 (2015), p.583-587 | ||
| 856 | |u http://ri.agro.uba.ar/files/intranet/articulo/2015mollard.pdf |i En reservorio |q application/pdf |f 2015mollard |x MIGRADOS2018 | ||
| 856 | |u https://www.wiley.com/ |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 942 | 0 | 0 | |c ARTICULO |
| 942 | 0 | 0 | |c ENLINEA |
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