Germination of Chloris barbata, Cynodon dactylon, and Cyperus rotundus from Angola at Constant and Alternate Temperatures

Loddo, Donato; Carlesi, Stefano; Cunha, A.T.P. da

doi:10.3390/agronomy9100615

Cited by 5 publications

(5 citation statements)

References 46 publications

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“…Temperature is a major environmental factor responsible for various changes in seed dormancy, and dormancy can be broken by fluctuating temperatures or warm/cold stratification. In general, fluctuating temperatures have been reported to promote seed germination more than constant temperatures [3,4]. However, for tulips, as reported by Tang, the seeds of T. iliensis required a period of cold stratification to germinate [5].…”

Section: Introductionmentioning

confidence: 90%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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The innate physiological dormancy of Tulipa thianschanica seeds ensures its survival and regeneration in the natural environment. However, the low percentage of germination restricts the establishment of its population and commercial breeding. To develop effective ways to break dormancy and improve germination, some important factors of seed germination of T. thianschanica were tested, including temperature, gibberellin (GA3) and/or kinetin (KT), cold stratification and sowing depth. The percentage of germination was as high as 80.7% at a constant temperature of 4 °C, followed by 55.6% at a fluctuating temperature of 4/16 °C, and almost no seeds germinated at 16 °C, 20 °C and 16/20 °C. Treatment with exogenous GA3 significantly improved the germination of seeds, but KT had a slight effect on the germination of T. thianschanica seeds. The combined treatment of GA3 and KT was more effective at enhancing seed germination than any individual treatment, and the optimal hormone concentration for the germination of T. thianschanica seeds was 100 mg/L GA3 + 10 mg/L KT. In addition, it took at least 20 days of cold stratification to break the seed dormancy of T. thianschanica. The emergence of T. thianschanica seedlings was the highest with 82.4% at a sowing depth of 1.5 cm, and it decreased significantly at a depth of >3.0 cm. This study provides information on methods to break dormancy and promote the germination of T. thianschanica seeds.

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Section: Introductionmentioning

confidence: 90%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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“…Chloris barbata (Chen, 2004) Chloris barbata (Figure 3) shows the actual view of the whole plant, leaves, inflorescence, stem, and roots of C. barbata. This grass species is commonly known as swollen finger grass.…”

Section: Species Accountsmentioning

confidence: 99%

“…Swollen finger grass requires areas with full sunlight and prefers dry areas making it less suitable to become a cover crop. It is also a host of several insects and it was noted as an alternative host of the grass-seed feeding thrips (Chen, 2004). Thus, this identified grass species in the study area is not suitable to become cover crops because none of this species satisfy the given four criteria.…”

Section: Speciesmentioning

confidence: 99%

Grasses and Legumes at the Banana Field in the Panabo City, Philippines

Allawan¹

2021

IJRSI

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Grasses and legumes play a major role in improving farm productivity in agriculture. The study determined the species of grasses and legumes at the banana field in the Panabo City, Philippines. A field layout was used as a guide in tagging the banana plants, which would correspond to a particular area in the field. These quadrats became the sampling plots of the study. The data collection was conducted in every randomly selected quadrat. Grasses and legume species enclosed in the quadrat were counted and descriptively characterized using a key identification guide on the basis of their morphological characteristics and with final confirmation from an expert. Data on species frequency, species diversity, and population density was also determined and analyzed total nitrogen and moisture content. The results showed four species of grasses (Chloris barbata, Echinochloa colona, Eleusine indica, and Rottboellia cochinchinensis) and two species of legumes (Mimosa pudica and Mimosa diplotricha). Based on the abundance and mean densities of grasses in the banana field, R. cochinchinensis dominated the study area, while the most abundant legume species was M. pudica. Soil analysis was found strongly acidic and there was a deficient of potassium, very low of phosphorus, and less organic matter. In addition, M. pudica had the highest nitrogen content of 3.14 while M. diplotricha had the highest moisture content of 82.6 among the identified species.

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“…Within the infestation region in Queensland, Australia, variable environmental conditions occur for rainfall and temperatures, and therefore weed populations may differ in their responses to these different environments and may require different management practices (Cai et al 2005;Iqbal et al 2019;Whitfield and Queensland Department of Environment and Resource Management 2010). Better knowledge and understanding of the factors that favor or prevent the spread and establishment of C. aromaticus under various environmental conditions are essential to develop effective local measures to prevent further spread (DiTomaso 2000; Loddo et al 2019). We present a comprehensive seed ecology study to facilitate an appropriate management plan addressing the complexity of C. aromaticus.…”

Section: Introductionmentioning

confidence: 99%

Germination biology of three populations of Navua sedge (Cyperus aromaticus)

Chadha

Florentine

Dhileepan³

et al. 2020

Weed Sci

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Navua sedge [Cyperus aromaticus (Ridley) Mattf. & Kük.] is an aggressive perennial sedge native to equatorial Africa which has become problematic in many Pacific islands and wet tropical Queensland, Australia. It has had a significant impact on livestock grazing industry, sugarcane (Saccharum officinarum L.) and banana (Musa acuminata Colla) plantations and various other ecosystems. A laboratory-based research investigation was conducted to understand germination and emergence requirements under various environmental conditions, of three geographically varied populations sourced from South Johnstone (SJ), Mackay (M) and Nyleta Creek (NC) in Queensland. Germination was identified to be stimulated by light with no germination recorded under darkness. Populations SJ and NC had optimal germination at alternating temperatures of 25/15, 30/20 and 35/25 C whereas population M had optimal germination at 25/15 and 30/20 C. All populations recorded over 85% germination in all pH levels tested. Seeds of population SJ was more sensitive to salinity compared to populations M and NC, with SJ showing no germination at 100 mM whereas populations M and NC had 23% and 9% germination, respectively. An inverse relationship was observed between osmotic potential and germination, with no germination recorded at osmotic potentials below -0.8 MPa in any population indicating moisture availability is a critical requirement for germination. Exposing seeds to 120 C radiant heat completely inhibited germination in populations M and NC, whereas 3% of population SJ germinated following a 180 s exposure at 120 C. Seedling emergence decreased as planting depth increased. Emergence was greatest for seeds on the soil surface or at 0.5 cm burial depth, consistent with germination being stimulated by light. Knowledge of these biological characteristics of C. aromaticus seed germination will assist in investigation of suitable control actions for this species particularly in the early stage of its invasion into new areas, and contribute to significant reduction in the soil-stored seed bank.

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Germination of Chloris barbata, Cynodon dactylon, and Cyperus rotundus from Angola at Constant and Alternate Temperatures

Cited by 5 publications

References 46 publications

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Grasses and Legumes at the Banana Field in the Panabo City, Philippines

Germination biology of three populations of Navua sedge (Cyperus aromaticus)

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