Germination requirements of two sheep - preferred grasses [Hordeum comosum and Koeleria vurilochensis var. patagonica] from semiarid Patagonian steppes

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Grazing by domestic exotic herbivores on native vegetation in Patagonian steppes has led to the deterioration of forage resources, where grasses are replaced by shrubs, and preferred grasses by non-preferred ones. Therefore, attempts at breeding and regeneration should start by identifying species w...

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Detalles Bibliográficos
Otros Autores: Gundel, Pedro Emilio, Irisarri, Jorge Gonzalo Nicolás, Sorzoli, Nadia Soledad, Mosso, Clara Emilia, García Martínez, Guillermo Carlos, Golluscio, Rodolfo Angel
Formato: Artículo
Lenguaje:Inglés
Materias:
HYDROTIME
NATIVE FORAGE SPECIES
SEED TRAITS
TEMPERATURE REQUIREMENT
THERMAL-TIME
WATER AVAILABILITY
DOMESTIC SPECIES
DORMANCY
FORAGE
GERMINATION
GRASS
HERBIVORE
LIGHT QUALITY
MORPHOLOGY
PERENNIAL PLANT
PLANT WATER RELATIONS
SEMIARID REGION
SHEEP
SHRUB
STEPPE
TEMPERATURE EFFECT
PATAGONIA
HORDEUM
HORDEUM COMOSUM
KOELERIA
OVIS ARIES
POACEAE
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Gundel2.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Germination requirements of two sheep - preferred grasses [Hordeum comosum and Koeleria vurilochensis var. patagonica] from semiarid Patagonian steppes 
520 |a Grazing by domestic exotic herbivores on native vegetation in Patagonian steppes has led to the deterioration of forage resources, where grasses are replaced by shrubs, and preferred grasses by non-preferred ones. Therefore, attempts at breeding and regeneration should start by identifying species with potential forage capability. Two perennial high-preferred species are the focus of this paper: Hordeum comosum and Koeleria vurilochensis. For the first time, we studied their morphological traits, dormancy level, and their temperature and water germination requirements, through thermal- and hydrotime models. H. comosum seeds were solid, large and heavy, while K. vurilochensis seeds were soft, small and light. Neither light-quality nor alternating temperature affected the dormancy level in seeds of both species. Seeds of H. comosum and K. vurilochensis required, respectively, 768.74 °Ch and 2217.89 °Ch to germinate; alternatively, base temperature was higher for H. comosum than for K. vurilochensis. The hydrotime required by H. comosum was 26 MPah and 110 Mpah for K. vurilochensis but, base water potential was -0.99 MPa and -1.45 MPa, respectively. For all the conditions, H. comosum displayed a higher germination rate compared to K. vurilochensis seeds. Deeper knowledge on the morphological and germination traits of seeds is a key step toward breeding and restoration of forage potential species. 
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773 |t Journal of Arid Environments  |g Vol.78 (2012), p.183-186 
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900 |a ^aSorzoli^bN.S.^tMTT Agrifood Research Finland, Plant Protection, 31600 Jokioinen, Finland 
900 |a ^aMosso^bC.E.^tINTA, EEA Esquel, AER Gobernador Costam, Estrada 850, [CP 9223] Chubut, Argentina 
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900 |a SEED TRAITS 
900 |a TEMPERATURE REQUIREMENT 
900 |a THERMAL-TIME 
900 |a WATER AVAILABILITY 
900 |a DOMESTIC SPECIES 
900 |a DORMANCY 
900 |a FORAGE 
900 |a GERMINATION 
900 |a GRASS 
900 |a HERBIVORE 
900 |a LIGHT QUALITY 
900 |a MORPHOLOGY 
900 |a PERENNIAL PLANT 
900 |a PLANT WATER RELATIONS 
900 |a SEMIARID REGION 
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900 |a SHRUB 
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900 |a Grazing by domestic exotic herbivores on native vegetation in Patagonian steppes has led to the deterioration of forage resources, where grasses are replaced by shrubs, and preferred grasses by non-preferred ones. Therefore, attempts at breeding and regeneration should start by identifying species with potential forage capability. Two perennial high-preferred species are the focus of this paper: Hordeum comosum and Koeleria vurilochensis. For the first time, we studied their morphological traits, dormancy level, and their temperature and water germination requirements, through thermal- and hydrotime models. H. comosum seeds were solid, large and heavy, while K. vurilochensis seeds were soft, small and light. Neither light-quality nor alternating temperature affected the dormancy level in seeds of both species. Seeds of H. comosum and K. vurilochensis required, respectively, 768.74 °Ch and 2217.89 °Ch to germinate; alternatively, base temperature was higher for H. comosum than for K. vurilochensis. The hydrotime required by H. comosum was 26 MPah and 110 Mpah for K. vurilochensis but, base water potential was -0.99 MPa and -1.45 MPa, respectively. For all the conditions, H. comosum displayed a higher germination rate compared to K. vurilochensis seeds. Deeper knowledge on the morphological and germination traits of seeds is a key step toward breeding and restoration of forage potential species. 
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