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Seed dormancy, germination, emergence and seed longevity in Galinsoga parviflora and G. quadriradiata

Benny De Cauwer (UGent) , R Devos, Sofie Claerhout (UGent) , Robert Bulcke (UGent) and Dirk Reheul (UGent)
(2014) WEED RESEARCH. 54(1). p.38-47
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Abstract
Galinsoga quadriradiata (hairy galinsoga) and Galinsoga parviflora (smallflower galinsoga, gallant soldier) are very troublesome weeds in many vegetable row crops in Europe. To optimise management strategies for Galinsoga spp. control, an in-depth study of germination biology was performed. Germination experiments were conducted to evaluate the impact of light and alternating temperatures on germination of a large set of Galinsoga populations. Seedling emergence was investigated by burying seeds at different depths in a sandy and sandy loam soil. Dormancy of fresh seeds harvested in autumn was evaluated by studying germination response in light at 25/20 degrees C with and without nitrate addition. Seed longevity was investigated in an accelerated ageing experiment by exposing seeds to 45 degrees C and 100% relative humidity. Galinsoga spp. seeds required light for germination; light dependency varied among populations. Seedling emergence decreased drastically with increasing burial depth. Maximum depth of emergence varied between 4 and 10mm depending on soil type and population. In a sandy soil, emergence percentages were higher and seedlings were able to emerge from greater depths than in a sandy loam soil. Freshly produced G.parviflora seeds, harvested in autumn, showed a varying but high degree of primary dormancy and were less persistent than G.quadriradiata seeds that lack primary dormancy. Lack of primary dormancy of freshly harvested G.quadriradiata seeds and light dependency for germination may be used to optimise and develop Galinsoga management strategies.
Keywords
WEED SEEDS, seed longevity, SOIL, CILIATA, PERSISTENCE, COMPOSITAE, ASTERACEAE, BIOLOGY, LIGHT, primary dormancy, photoblasticity, emergence, burial depth, hairy galinsoga, gallant soldier

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Citation

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Chicago
De Cauwer, Benny, R Devos, Sofie Claerhout, Robert Bulcke, and Dirk Reheul. 2014. “Seed Dormancy, Germination, Emergence and Seed Longevity in Galinsoga Parviflora and G. Quadriradiata.” Weed Research 54 (1): 38–47.
APA
De Cauwer, Benny, Devos, R., Claerhout, S., Bulcke, R., & Reheul, D. (2014). Seed dormancy, germination, emergence and seed longevity in Galinsoga parviflora and G. quadriradiata. WEED RESEARCH, 54(1), 38–47.
Vancouver
1.
De Cauwer B, Devos R, Claerhout S, Bulcke R, Reheul D. Seed dormancy, germination, emergence and seed longevity in Galinsoga parviflora and G. quadriradiata. WEED RESEARCH. 2014;54(1):38–47.
MLA
De Cauwer, Benny, R Devos, Sofie Claerhout, et al. “Seed Dormancy, Germination, Emergence and Seed Longevity in Galinsoga Parviflora and G. Quadriradiata.” WEED RESEARCH 54.1 (2014): 38–47. Print.
@article{4298570,
  abstract     = {Galinsoga quadriradiata (hairy galinsoga) and Galinsoga parviflora (smallflower galinsoga, gallant soldier) are very troublesome weeds in many vegetable row crops in Europe. To optimise management strategies for Galinsoga spp. control, an in-depth study of germination biology was performed. Germination experiments were conducted to evaluate the impact of light and alternating temperatures on germination of a large set of Galinsoga populations. Seedling emergence was investigated by burying seeds at different depths in a sandy and sandy loam soil. Dormancy of fresh seeds harvested in autumn was evaluated by studying germination response in light at 25/20 degrees C with and without nitrate addition. Seed longevity was investigated in an accelerated ageing experiment by exposing seeds to 45 degrees C and 100\% relative humidity. Galinsoga spp. seeds required light for germination; light dependency varied among populations. Seedling emergence decreased drastically with increasing burial depth. Maximum depth of emergence varied between 4 and 10mm depending on soil type and population. In a sandy soil, emergence percentages were higher and seedlings were able to emerge from greater depths than in a sandy loam soil. Freshly produced G.parviflora seeds, harvested in autumn, showed a varying but high degree of primary dormancy and were less persistent than G.quadriradiata seeds that lack primary dormancy. Lack of primary dormancy of freshly harvested G.quadriradiata seeds and light dependency for germination may be used to optimise and develop Galinsoga management strategies.},
  author       = {De Cauwer, Benny and Devos, R and Claerhout, Sofie and Bulcke, Robert and Reheul, Dirk},
  issn         = {0043-1737},
  journal      = {WEED RESEARCH},
  keyword      = {WEED SEEDS,seed longevity,SOIL,CILIATA,PERSISTENCE,COMPOSITAE,ASTERACEAE,BIOLOGY,LIGHT,primary dormancy,photoblasticity,emergence,burial depth,hairy galinsoga,gallant soldier},
  language     = {eng},
  number       = {1},
  pages        = {38--47},
  title        = {Seed dormancy, germination, emergence and seed longevity in Galinsoga parviflora and G. quadriradiata},
  url          = {http://dx.doi.org/10.1111/wre.12055},
  volume       = {54},
  year         = {2014},
}

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