Invasiveness evaluation of fireweed (<i>Crassocephalum crepidioides</i>) based on its seed germination features

Chen, Guo Qi; Guo, Shui Liang; Huang, Qiu Sheng

doi:10.1111/j.1445-6664.2009.00329.x

Cited by 27 publications

(28 citation statements)

References 8 publications

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“…In P. oleracea ‐infested croplands, covering the soil with 0.5 cm or more of additional soil could be an effective way of reducing the germination of its seeds. Moreover, during the hot season, ‘stale seedbed’ management practices that aim to deplete the seedbank before crop planting (Chen et al ., ) could be useful. Also, planting living mulch (Mohler & Callaway, ) on the land and allowing it to be fallow during the hot months could reduce P. oleracea abundance and thus decrease its seedbank.…”

Section: Discussionmentioning

confidence: 99%

The hotter the weather, the greater the infestation of Portulaca oleracea: opportunistic life‐history traits in a serious weed

et al. 2015

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Portulaca oleracea, an r-strategist, is one of the world's most troublesome weeds. During hot seasons, P. oleracea frequently becomes monodominant in choy sum (Brassica parachinensis) fields in Guangzhou city, southern China. Here, we studied the seasonal dynamics of P. oleracea's germinable soil seedbank, population density and above-ground biomass in choy sum fields that had been cultivated continuously for several years. Using P. oleracea seeds collected from these fields, we tested seed dormancy, survival and germination, seedling growth and generation time. Portulaca oleracea occurred at high levels during the hot season, but its occurrence was low, and the germinable soil seedbank was much greater during the cold season. The weed's opportunistic characteristics allowed it to avoid freezing and to proliferate during optimal conditions. Portulaca oleracea's generation time was very flexible, as short as 31 days during the hot season, but longer than 100 days during the colder season. Seed dormancy tended to be shorter when the seeds were stored at a higher temperature. At a temperature of 35°C, both seed germination and seedling growth showed advantages over those of choy sum. Storage for one year at a temperature of À20°C or burial in a paddy field did not significantly reduce P. oleracea seed germination. Nevertheless, seed storage at a temperature of 15°C and soil coverage of 0.5 cm on top of the seeds significantly constrained seed germination. 'Stale seedbed' and/or coverage of the surface with soil are recommended during the hot season. However, rotation of rice and upland crops is not an efficient method for managing Portulaca oleracea infestation.

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Section: Discussionmentioning

confidence: 99%

The hotter the weather, the greater the infestation of Portulaca oleracea: opportunistic life‐history traits in a serious weed

et al. 2015

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“…Buffer solutions with pH values of 4–10 were prepared according to the method that was described by Chen et al . (). Filter papers were dampened with the relevant solutions and the Petri dishes were incubated as described in the general seed germination test protocol.…”

Section: Methodsmentioning

confidence: 97%

Seed germination and seedling emergence of Iberian starthistle (Centaurea iberica)

Nosratti

Abbasi

Bagheri

et al. 2017

Weed Biology and Management

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Centaurea iberica has become a problematic weed in some regions of western Iran. Little published data are available in the literature regarding its seed germination and seedling emergence. Therefore, this study was conducted in order to evaluate the effects of different factors on C. iberica seed germination. The highest level of germination of C. iberica was achieved at fluctuating temperatures of 15/25 C (night/day). The seed germination of C. iberica was stimulated by light and little germination occurred under continuous darkness. The pH solution did not have any effect on its seed germination. Centaurea iberica was tolerant to both salt and water stress. The level of seedling emergence was greatest for the seeds that were located on the soil surface, declining with depth, and no seedling emerged from a soil depth of 4 cm. These results indicated that C. iberica has the potential to infest more fields in the western parts of Iran, particularly rainfed areas. Based on the results of this study, crops with a dense canopy and/or planted in narrow-row intervals could be used to diminish the seed germination of C iberica. In addition, the adoption of tillage systems that bury the seeds of C. iberica under the 4 cm depth would effective in its management.

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“…The lower level of allelopathic effects were reported in Crassocephalum crepidioides and Phyllanthus debilis that showed 34.6 and 36.4% of inhibitory percentages on growth of lettuce seedlings. Chen et al (2009) stated that although Crassocephalum crepidioides has been listed as an invasive plant, it also cultivated as a vegetable in China, which indirectly indicated the less toxicity compared to other weed species. However, scientific evidence available on the allelopathic effect of Phyllanthus debilis is very limited in the literature.…”

Section: Discussionmentioning

confidence: 99%

Screening of allelopathic activity of common weed species occurring in agricultural fields

Kaliyadasa¹,

Jayasinghe²

2018

Afr. J. Agric. Res.

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The investigation of allelopathic effects of different plant species is important to prevent serious crop losses that would arise. The usage of such materials as mulch, cover crops or residues will be useful to implement in integrated weed management strategies of agricultural fields. Therefore, this study was conducted to screen the allelopathic effect of selected plant species using seedlings growth of lettuce (Lactuca sativa L.) as an indicator. The sandwich method was used and 20 mg of dried plant material, resembling the leaf litter, from 27 species were placed in petri dishes. Twenty-eight treatments including the control treatment were arranged in a Completely Randomized Design (CRD). On the fifth day after the establishment of lettuce seeds, hypocotyl length (cm), radicle length (cm) and total height (cm) of seedlings were measured. The inhibitory percentage was calculated and a dendrogram with single linkage was developed. Results revealed that the lowest hypocotyl and radicle lengths with the highest inhibitory percentage were recorded for Ageratum conyzoides, Cassia occidentals and Clidemia hirta when compared to the control treatment (p<0.05). Weed species expressed varying degree of inhibitory effects on growth performances of lettuce seedlings. Further studies need to be carried out to explore the effects of allelopathy on crop plants.

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Invasiveness evaluation of fireweed (Crassocephalum crepidioides) based on its seed germination features

Cited by 27 publications

References 8 publications

The hotter the weather, the greater the infestation of Portulaca oleracea: opportunistic life‐history traits in a serious weed

The hotter the weather, the greater the infestation of Portulaca oleracea: opportunistic life‐history traits in a serious weed

Seed germination and seedling emergence of Iberian starthistle (Centaurea iberica)

Screening of allelopathic activity of common weed species occurring in agricultural fields

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