Impact of environmental factors on seed germination and emergence of wild poinsettia (Euphorbia geniculata Ortega)

Cochavi, Amnon; Goldwasser, Yaakov; Horesh, Alon; Igbariya, Karam; Lati, Ran Nisim

doi:10.1016/j.cropro.2018.08.019

Cited by 7 publications

(8 citation statements)

References 43 publications

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“…The estimated temperatures are in agreement with those for other weed species originating from the southern United States and Central America that are associated with warm and dry climates. For example, the T b value (10.82 C) revealed in our study is within the range of other typical "summer" weeds, between 7.5 C (common purslane [Portulaca oleracea L.]) and 16.9 C (Palmer amaranth [Amaranthus palmeri S. Watson]) (Cochavi et al 2018). Furthermore, the optimal germination temperature of 23.8 C and high ceiling temperature of 35.9 C, which are typical for the Israeli early and midsummer, respectively, can explain the adoption of this weed over wide areas in the Mediterranean region.…”

Section: Development Of the Solanum Elaeagnifolium Germination Dynami...supporting

confidence: 80%

“…Temperature measurements establish the basis for a number of weed germination predictive models, many of which use an empirical approach (Cochavi et al 2018;Doyle 1991;Hosseini et al 2017). The concept of these empirical models is based on thermal time units, that is, summing heat units above minimal temperature thresholds to predict the germination dynamics (Trudgill et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Development of a temperature-based seed germination model for silverleaf nightshade (Solanum elaeagnifolium)

2022

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Silverleaf nightshade (Solanum elaeagnifolium Cav.) has become a highly troublesome weed in irrigated summer crops in Israel. Since herbicide-based options to control this weed are limited, the best way to improve weed control is through a study of its biology, particularly its germination dynamics. The main objective of this study was thus to determine the impact of temperature on the seed germination dynamics of S. elaeagnifolium and to develop a temperature-based (thermal) prediction model for three S. elaeagnifolium populations growing in different ecosystems in Israel. To this end, a laboratory study was undertaken in which the germination proportion of S. elaeagnifolium seeds were monitored under seven temperature regimes: 2/8, 7/13, 12/18, 17/23, 22/28, 27/33 and 32/38 C (night/day). In addition, the impact of alternating temperature regimes between night and day temperatures (of 0, 2, 4, 6, 8 and 10 C), that were averaged over 20 and 25 C, was determined. It was found that the three populations shared similar germination characteristics and dynamics. An alternation of ≥ 6 C between night and day temperatures was needed for optimal germination, with no germination taking place under constant temperatures. In all three populations, the minimal requirement for germination was a 12/18 C (night/day) regime, with the final germination proportion lying between 0.25 and 0.36. The highest final germination proportion ≥0.8 was observed for the 17/23 C regime in all three populations. Modeling the germination rate as a function of temperature allowed us to determine cardinal temperatures for all three populations taken together, with the values being T b = 10.8 C (base temperature), T o = 23.8 C (optimal temperature) and T c = 35.9 C (ceiling temperature). These biological parameters allowed accurate (RMSE<0.06%) prediction of S. elaeagnifolium seed germination over the entire temperature range.

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Section: Development Of the Solanum Elaeagnifolium Germination Dynami...supporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Development of a temperature-based seed germination model for silverleaf nightshade (Solanum elaeagnifolium)

2022

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“…Development of IWM depends on a sound knowledge of a weed’s biology and ecology. Seed germination and seedling emergence are critical stages in most weed lifecycles and thus determine the successful survival, establishment, and dispersal of weeds in an agro-environment [ 2 ]. Therefore, a comprehensive knowledge of seed germination traits is essential to develop strategies for successful management and/or suppression of weed seed germination.…”

Section: Introductionmentioning

confidence: 99%

Germination ecology of Chenopodium album L. and implications for weed management

Tang

Guo²,

Yin³

et al. 2022

PLoS ONE

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Chenopodium album L. is a troublesome annual species in various cropping systems, and a sound knowledge of the ecological response of C. album germination to environmental factors would suggest suitable management strategies for inhibiting its spread. Preliminary laboratory-based research was conducted to investigate germination and emergence requirements of C. album under various environmental conditions (e.g., photoperiods, constant temperature, salinity, moisture, soil pH, burial depth, and oat crop residue). Results showed C. album seeds were found to be photoblastic, with only 13% germination in darkness. The maximum germination (94%) of C. album occurred at an optimal temperature of 25°C, and the depressive effect of other temperatures on germination was more severe at lower rather than higher temperatures. Seed germination was suitably tolerant of salinity and osmotic potential, with germination observed at 200 mM NaCl (37.0%) and -0.8 MPa (20%), respectively. Germination was relatively uniform (88–92%) at pH levels ranging from 4 to 10. The maximum germination of C. album was observed on the soil surface, with no or rare emergence of seeds at a burial depth of 2 cm or under 7000 kg ha-1 oat straw cover, respectively. Information provided by this study will help to develop more sustainable and effective integrated weed management strategies for the control of C. album, including (i) a shallow-tillage procedures to bury weed seeds in conventional-tillage systems and (ii) oat residue retention or coverage on the soil surface in no-tillage systems.

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“…Br.) (Chauhan et al 2018;Cochavi et al 2018;Nosratti et al 2018;Rao et al 2008). However, the optimal pH for the germination of M. aquaticum was found to be in the range of 6 to 7, leading to a final germination percentage of 81% to 95%, which was significantly greater than the germination percentage observed at all other pH levels (Figure 2).…”

mentioning

confidence: 86%

“…To assess the effect of osmotic potential on M. aquaticum germination, seeds of the three M. aquaticum populations were placed in 0, −0.1, −0.3, −0.5, −0.7, −0.9, −1.1, and −1.3 MPa solutions prepared by dissolving polyethylene glycol 6000 (Beijing Yili Fine Chemicals, Beijing, China) in distilled water (Michel and Kaufmann 1973). To assess the effect of NaCl concentration on M. aquaticum germination, seeds of the three M. aquaticum populations were placed in 0, 20,40,80,120,160,200,240,280,320,360, and 400 mM NaCl solutions prepared as described by Cochavi et al (2018). At the end of the test, the ungerminated seeds were removed, rinsed, and placed in deionized water to check their viability.…”

Section: Effect Of Osmotic Potential and Nacl Concentration On Germinmentioning

confidence: 99%

Germination ecology of giant chickweed (Myosoton aquaticum)

Wang

Bai

et al. 2020

Weed Sci

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Giant chickweed [Myosoton aquaticum (L.) Moench], a troublesome broadleaf weed species, is widespread in winter wheat (Triticum aestivum L.) fields in China. However, limited information is available on its seed germination and seedling emergence ecology. Thus, three M. aquaticum populations (JS, HN and AH) from different geographic regions were studied under laboratory conditions to determine the effects of different environmental factors on seed germination or seedling emergence. The seeds germinated at a relatively wide constant temperature range of 5-25 C; however, the optimal temperature for germination varied among the populations. Compared with constant temperatures, fluctuating temperatures with the same mean significantly improved the final germination of all populations. Light was not required for seed germination. The seeds germinated under a wide pH range of 3-10, and the optimum pH was 6-7, with a final germination percentage of 81-95%. The seeds of all populations showed similar sensitivities to osmotic potential and similar high tolerances of saline conditions. The seedling emergence of all populations decreased with increasing burial depth, and no emergence was observed when the seeds were buried more than 3 cm, but the AH population showed higher sensitivity to burial depth than the others. The results generated from this study will contribute to the development of integrated M. aquaticum management strategies for winter wheat fields in China, and deep plowing and late sowing of autumn-sown wheat are suggested for managing M. aquaticum, as it showed lower germination at a low temperature and under relatively deep burial.

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Impact of environmental factors on seed germination and emergence of wild poinsettia (Euphorbia geniculata Ortega)

Cited by 7 publications

References 43 publications

Development of a temperature-based seed germination model for silverleaf nightshade (Solanum elaeagnifolium)

Development of a temperature-based seed germination model for silverleaf nightshade (Solanum elaeagnifolium)

Germination ecology of Chenopodium album L. and implications for weed management

Germination ecology of giant chickweed (Myosoton aquaticum)

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