Seed germination responses to soil hydraulic conductivity and polyethylene glycol (PEG) osmotic solutions

Camacho, Manuel E.; Heitman, Joshua L.; Gannon, Travis W.; Amoozegar, Aziz; León, Ramón G.

doi:10.1007/s11104-021-04857-5

Cited by 12 publications

(14 citation statements)

References 41 publications

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“…In the field, seed germination, which may take several days or weeks, will probably encounter periods of drought. Crucial aspects in the germination process are the soil water potential and the length of the hydration period [33,34]. When the soil water potential is suitable (<15% PEG) for P. kansuensis, the seeds begin to germinate after absorbing enough water.…”

Section: Discussionmentioning

confidence: 99%

Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands

Deng³

et al. 2022

Plants

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The semiparasitic weed Pedicularis kansuensis Maxim. has rapidly spread in the alpine grasslands of northern China over the past twenty years and has caused serious ecological problems. In order to effectively halt the spread of this weed, a thorough understanding of the dormancy type and the seed-germination ecology of P. kansuensis is required. We have conducted a series of experiments to investigate the effects of plant growth regulators (gibberellin (GA3) and strigolactone synthesis (GR24)), as well as different abiotic (temperature, light, cold stratification, and drought) and biotic (aqueous extracts of three native dominant plants) factors on the seed-germination characteristics of P. kansuensis. The seed-germination percentages ranged from 2% to 62% at all of the temperatures that were examined, with the highest occurring at 25/10 °C. The light conditions did not significantly affect the germination percentage. The seed germination was greatly improved after two to eight weeks of cold stratification. The seed germination decreased dramatically with an increasing polyethylene glycol (PEG-6000) concentration, from 55% to 0%, under 10% and 20% PEG-6000. The seed germination was improved at a proper concentration of GA3, GR24, and the aqueous extracts of Festuca ovina L., Stipa purpurea L., and Leymus secalinus (Georgi) Tzvel. Furthermore, in the pot experiment, the seedling emergence of P. kansuensis was also improved by the cultivation of these three dominant grasses. These findings indicate that the dormancy type of P. kansuensis seeds is non-deep physiological dormancy, and such findings will help in paving the way for the creation of effective weed management strategies, based on a thorough knowledge of germination ecology.

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Section: Discussionmentioning

confidence: 99%

Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands

Deng³

et al. 2022

Plants

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“…Thus, field-sampled soils are more suitable as test media compared with potting mix or solutions, in the interest of transferability. Supporting this hypothesis,Camacho et al (2021) observed varying responses of seed germination of multiple weed and crop species between PEG versus soil test media as well as among different soil textural groups under the same water potentials.…”

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confidence: 60%

Effect of water stress on weed germination, growth characteristics, and seed production: a global meta-analysis

Singh

Thapa²,

Kukal³

et al. 2022

Weed Sci

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Along with other resources, weeds compete for soil moisture with crops, which can impact the germination, growth, and seed production of weeds; however, this impact has not been systematically recorded and synthesized across diverse studies. To address this knowledge gap, a global meta-analysis was conducted using 1,196 paired observations from 86 published articles assessing the effect of water stress on weed germination, growth characteristics, and seed production. These studies were conducted and published during 1970-2020 across four continents (Asia, Australia, Europe, and North America). Imposed water stress was expressed as solution osmotic potential (ψ solution ), soil water potential (ψ soil ), or soil moisture as percent field capacity. Meta-analysis revealed that water stress inhibits weed germination, growth, and seed production, and the quantitative response intensified with increasing water stress. A ψ solution greater than -0.8 MPa completely inhibits germination of both grass and broadleaf weeds. A ψ solution between -0.09 to -0.32 MPa reduces weed germination by 50% compared with the unstressed condition. Moderate soil water stress, equivalent to 30-60% field capacity, inhibits growth characteristics (branches or tillers per plant, leaf area, leaves per plant, plant height, root, and shoot biomass) by 33% and weed seed production by 50%. Severe soil water stress, below 30% field capacity, inhibits weed growth by 51% and seed production by 88%. Although water stress inhibits weed growth, it doesn’t entirely suppress the ability to germinate, grow, and produce seeds, resulting in weed seedbank accumulation. This creates management challenges for producers because weed seeds can survive in the soil for many years, depending on weed species and environmental conditions. Quantitative information compiled in this meta-analysis can be instrumental to model the weeds’ multi-dimensional responses to water stress and designing integrated weed management strategies for reducing weed seedbank.

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“…Jha and Norsworthy (2012) found decreased viability of seeds from Palmer amaranth treated with higher rate of glufosinate at reproductive stages. Differences between the differential germination exhibited by the Palmer amaranth collected from different locations and from plants surviving different glufosinate application timings was not unexpected as this dioecious species has high germination variability (Camacho et al., 2021; Ehleringer, 1983; Steckel et al., 2004).…”

Section: Resultsmentioning

confidence: 99%

“…Palmer amaranth GR 50 ranged from 0.7 to 4.5 d, whereas viability ranged from 63 to 90% for all locations and application timings, respectively (Table 4). Across both germination chambers and runs, Palmer amaranth treated mid postemergence fb late postemergence at the Walnut location (Camacho et al, 2021;Ehleringer, 1983;Steckel et al, 2004).…”

Section: Palmer Amaranth Germinationmentioning

confidence: 99%

Biological effects on Palmer amaranth surviving glufosinate

Jones

León

Everman

2022

Agrosystems Geosci & Env

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Palmer amaranth (Amaranthus palmeri S. Watson) is a difficult weed to manage due to competitive growth, fecundity, and evolved herbicide resistance. Limited information exist on the fecundity of vegetative stage Palmer amaranth surviving glufosinate applied at different timings. In addition, research has not investigated the germination or glufosinate susceptibility of the offspring from these surviving plants. Field experiments were conducted across three locations in 2019 to determine (a) the fecundity of Palmer amaranth plants surviving glufosinate applied at different vegetative growth stages, and (b) if the offspring from the surviving plants exhibited differential germination and susceptibility to glufosinate. Palmer amaranth was treated at three different vegetative sizes (5 cm, 7-10 cm, > 10 cm) and orthogonal combinations of these application timings. The application timings corresponded to early-, mid-and late-postemergence applications. Palmer amaranth plants surviving the mid-, late-, and the mid postemergence followed by late postemergence glufosinate application were fecund. Palmer amaranth plants surviving the mid postemergence followed by late postemergence application produced less seed than the plants surviving the mid postemergence and late postemergence application. Palmer amaranth was controlled with other glufosinate applications resulting in no seed production. Germination was affected across location and glufosinate treatments, but no clear trend/pattern was observed. The offspring from Palmer amaranth plants surviving glufosinate applications were controlled by all glufosinate rates tested. These experiments provide evidence that Palmer amaranth surviving glufosinate in the vegetative stages may remain fecund, but fecundity can vary with application timing. No measurable effect on the offspring germination or susceptibility to glufosinate was apparent.

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Seed germination responses to soil hydraulic conductivity and polyethylene glycol (PEG) osmotic solutions

Cited by 12 publications

References 41 publications

Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands

Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands

Effect of water stress on weed germination, growth characteristics, and seed production: a global meta-analysis

Biological effects on Palmer amaranth surviving glufosinate

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