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Germination behaviour of Italian ryegrass in flooding pampa rangelands

Published online by Cambridge University Press:  19 September 2008

Adriana M. Rodriguez ,
Elizabeth J. Jacobo  and
V. Alejandro Deregibus
Adriana M. Rodriguez*
Affiliation:
Cátedra de Forrajes, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453. (1475), Buenos Aires, Argentina
Elizabeth J. Jacobo
Affiliation:
Cátedra de Forrajes, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453. (1475), Buenos Aires, Argentina
V. Alejandro Deregibus
Affiliation:
Cátedra de Forrajes, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453. (1475), Buenos Aires, Argentina
*
* Fax: 541 01 5211384 E-mail: ezjacobo@mail.retina.ar
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Abstract

Lolium multiflorum Lam., a winter annual grass species originating from the Mediterranean region, has become widespread in native grasslands of the flooding pampa (Argentina). The dynamics of dormancy release of L. multiflorum seeds in simulated natural conditions was studied. Dormancy was overcome by exposing imbibed seeds to mild cool temperatures (15°C or below) for brief periods (pre-chilling). After-ripening progressively released dormancy, at a higher rate in seeds that remained under the canopy (30/20°C) than those that were dry-stored (20°C). Germination was promoted by red light only when the after-ripening requirement was partially fulfilled or after pre-chilling treatment. These results provide useful knowledge for designing grazing strategies aimed at obtaining well-developed ryegrass canopy of high forage quality during winter and spring.

Keywords

after-ripeninggerminationItalian ryegrass (Lolium multiflorum)lightpre-chillingtemperature
Type
Ecology
Information
Seed Science Research , Volume 8 , Issue 4 , December 1998 , pp. 521 - 528
Copyright
Copyright © Cambridge University Press 1998

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