Germination of Wild Poinsettia<i>(Euphorbia heterophylla)</i>

Bannon, James Sanford; Baker, J. B.; Rogers, R. L.

doi:10.1017/s0043174500049766

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…Low temperature (< 15°C) as well as daily thermoperiods of 15/6°C and 20/10°C were also inhibitory to germination in E. supina (Baskin & Baskin, 1979;Krueger & Shaner, 1982). Temperatures that are optimal for germination of weed summer annual spurges such as E. heterophylla (Bannon et al, 1978), E. supina (Krueger & Shaner, 1982) and E. geniculata (Kigel etal, 1984) are in the range 25-30°C.…”

Section: Discussionmentioning

confidence: 99%

Biology of reproduction in the summer annual weed Euphorbia geniculata Ortega

et al. 1992

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Different developmental traits that determine the reproductive strategy of E. geniculata were studied in order to obtain the basic information needed for an integrated approach to the control of this weed. Effects of daylength (8 h vs. 16 h) and temperature (range 32/17°C-17/12°C) on growth and flowedng were examined under controlled conditions. E. geniculata has a quantitative short-day flowedng response, e.g. short days advanced flowedng by c. 3 weeks compared to long days. Growth and flowedng were strongly inhibited by temperatures lower than 22/17°C. Seedlings have a strong potential for regeneration after injury to the apical bud, due to the production of numerous hypocotyledonary adventitious buds. Temporal changes in seed dormancy were examined in five different populations infesting cotton fields. Only two populations had pdmary dormancy after seed dispersal, and this disappeared completely after c. 10 months of dry storage. Seed viability of dry stored seeds was relatively short, e.g. less than 5% of the seeds germinated after 14 or 40 months in the least or most dormant populations, respectively. Patterns of germination and seedling emergence in the field were determined mainly by water availability and pedods of low temperature. No *To whom correspondence should be addressed. cyclic changes in dormancy were found in buded seeds. It is proposed that, in E. geniculata, the absence of prolonged seed dormancy, short seed longevity and relatively small seed output will result in a limited transient seed-bank. Biologie de la reproduction chez I'adventice estivale annuelle Euphorbia geniculata OrtegaDifferents traits de developpement qui determinent la strategie de reproduction d'E. geniculata ont ete etudiees pour fournir une information de base necessaire pour une approche integree de la lutte contre cette adventice. Les effets de la longueur du jour (8 h-16 h) et de la temperature (allant de 32/17°C a 17/12°C) sur la croissance et la floraison ont ete observes sous conditions controiees. E. geniculata a une floraison influencee quantitativement par les jours courts, par exemple les jours courts ont avance la floraison d'environ 3 semaines par rapport a des jours longs. La croissance et la floraison ont ete severement inhibees par des temperatures infedeures k 22/17°C. Les plantules ont un fort potentiel de regeneration apres une blessure du bourgeon apical dues a la production de nombreux bourgeons adventices hypocotyledonaires. Des changements temporaires dans la dormance des graines ont ete observes dans 5 populations differentes infestant des champs de coton. Seulement 2 populations avaient une dormance pdmaire apres la dispersion grainiere et elle disparaissait completement apres environ 10 mois de stockage au sec. La viabilite des graines apres un stockage au sec etait relativement faible, par exemple moins de 5% de grains ont germe apres 14 ou 40 mois dans les populations les moins ou les plus dormantes respectivement. Les profils de germination et de levee des plantules au champ ont ete determines 3...

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Section: Discussionmentioning

confidence: 99%

Biology of reproduction in the summer annual weed Euphorbia geniculata Ortega

et al. 1992

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“…Nos E.U.A. (Bannon et al, 1978) as sementes recém-colhidas são dormentes, mas em Israel (Kigel et al, 1992) (Bannon et al, 1978;Suda, 1991;Kigel et al, 1992;Brecke, 1995). As porcentagens de germinação no escuro são mais baixas comparando-se com a germinação na luz, entretanto, podem aumentar com o tempo e/ou condições de armazenamento.…”

Section: Germinação Das Sementesunclassified

“…Nos E.U.A. as sementes armazenadas a 5 ºC não germinam a 25 ºC no escuro, mas se forem armazenadas a 36 ºC a germinação aumenta com o tempo de estocagem (Bannon et al, 1978). A necessidade de luz na germinação a 25 ºC parece estar relacionada à temperatura e ao fotoperíodo em que ocorreu o desenvolvimento da planta parental e a maturação do fruto.…”

Section: Germinação Das Sementesunclassified

“…b) Em temperaturas alternadas as sementes de E. heterophylla não necessitam de luz para que germinem (Bannon et al, 1978;Suda, 1991) e o regime de 25/35 ºC resulta em níveis muito próximos a 100 % de germinação (Bannon et al, 1978;Suda, 1991). Esses níveis podem ser atingidos também por sementes germinadas a 30 ºC ou a 35 ºC constante, independentemente da presença de luz (Suda, 1991;Brecke, 1995).…”

Section: Germinação Das Sementesunclassified

“…É também capaz de emergir do solo de profundidades entre 0 e 15 cm, embora a profundidade ótima de semeadura esteja entre 2 e 5 cm (Bannon et al, 1978;Cerdeira & Voll, 1980;Machado Neto & Pitelli, 1980;Kigel et al, 1992;Brecke,1995). A viabilidade das sementes é mantida mesmo quando elas são enterradas durante vários meses no solo, em profundidades relativamente grandes como 20 ou 30 cm.…”

Section: Germinação Das Sementesunclassified

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