Effect of seasonality and light levels on seed germination of the invasive tree Maesopsis eminii in Amani Nature Forest Reserve, Tanzania

Mwendwa, Beatus; Kilawe, Charles Joseph; Treydte, Anna C.

doi:10.1016/j.gecco.2019.e00807

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…), although seedlings could also establish in dense shade and grow rapidly when exposed to high light conditions (Greenberg et al 2001). Indeed, numerous introduced plant studies identified positive photoblastic seeds that exhibit an increase in germination when exposed to high light conditions, which may enhance performance in disturbed areas (Bittencourt et al 2017; Cervera and Parra-Tabla 2009; Lamsal et al 2019; Leal et al 2013; Mwendwa et al 2020; Qi et al 2014). However, germination requirements and shade tolerance at later life stages may be uncoupled (Figueroa and Lusk 2001).…”

Section: Resultsmentioning

confidence: 99%

Seed longevity and germination of the emerging invasive species wavyleaf basketgrass (Oplismenus undulatifolius) under varied light regimes

Pham,

2023

Invasive plant sci. manag.

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Invasive non-indigenous species pose a serious threat to native biodiversity and ecosystem functioning. Understanding how species performance varies under conditions in the current and invaded range can help to predict dynamics of the invading species in its new environment. Plants with the ability to alter growth in response to variation in light conditions may be favored in landscapes that experience frequent disturbance, as these species may be able to exploit a wide range of niches. Seed bank persistence may also play a critical role in successful plant invasion, as extended seed viability may increase the chance of outlasting unfavorable conditions, maintain population genetic diversity, and allow re-invasions. This study investigated seed longevity and the effect of light intensity on germination of wavyleaf basketgrass [Oplismenus undulatifolius (Ard.) P. Beauv], a newly established invasive species in US mid-Atlantic forest understories. Oplismenus undulatifolius seeds were collected across five years from the original site of introduction in Maryland USA and stored in standard lab conditions, then subjected to germination trials under four light conditions in a controlled growth chamber. Seeds remained viable for at least nine years, and light intensity did not significantly impact seed germination. Our study demonstrates the importance of evaluating environmental and temporal effects on germination traits, since the scope of surveillance in the field may need to be expanded based on new information about environmental tolerance. Long-term monitoring may also be necessary to effectively control invasive plant populations capable of forming a persistent seed bank.

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Section: Resultsmentioning

confidence: 99%

Seed longevity and germination of the emerging invasive species wavyleaf basketgrass (Oplismenus undulatifolius) under varied light regimes

Pham,

2023

Invasive plant sci. manag.

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“…The screen house protected the seedlings from damaging insects i.e., aphids and white flies. Fifteen seeds (15) of P. vulgaris and Z. mays were sowed in twenty-five pots (2 l) each. Pots were watered thoroughly at the time of sowing (i.e., 0.5 l per pot).…”

Section: Seedling Growth Experimentsmentioning

confidence: 99%

“…In their nonnative range, AIPs jeopardize ecological integrity [9][10][11], food production [3,12], and the provision of ecosystem services essential for human sustainability [13,14]. Billions of dollars are spent annually on the monitoring and control efforts of AIPs, which also cause higher food prices and lower farm incomes globally [9,15,16]. In addition to being able to compete with and suppress native plants and crops, most AIPs also possess anti-herbivorous and anti-microbial traits, which means they have no natural enemies in their new range [17,18].…”

Section: Introductionmentioning

confidence: 99%

InvasiveArgemone mexicana’s suppressive effects onPhaseolus vulgarisandZea maysgermination and growth

Ojija

2023

Preprint

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Invasive Argemone mexicana plant species is invading many ecosystems in East Africa. However, there have not been many studies to assess how it affects plants. In petri dishes and pot experiments, we investigated the suppressive effects of A. mexicana on Phaseolus vulgaris and Zea mays germination and seedling growth. To investigate its suppressive effects on the test plant, different concentrations of A. mexicana leaf (AmL) crude extract were applied to the seeds and seedlings of P. vulgaris and Z. mays. At higher concentrations (70% and 100%), the findings showed that AmL crude extract concentrations reduced the germination and growth of P. vulgaris and Z. mays seeds. Compared to seeds that germinated at lower concentrations and in the control (0%) group, fewer seeds at higher concentrations grew. Accordingly, higher concentrations, relative to lower ones and controls, retarded seed germination. Additionally, the fresh biomass, root lengths, stem diameters, and heights of P. vulgaris seedlings were reduced under 75% and 100% AmL concentrations, which had a negative impact on their growth vigor. Although this study shows that P. vulgaris and Z. mays germination and growth were inhibited by A. mexicana crude extract, field research experiments are needed to investigate the suppressive effects of this invasive weed on other plant species. Due to its detrimental impact on plant growth, the study recommends further management of A. mexicana to protect biodiversity. It is expected that these results will be helpful in developing policies and programs for managing invasive plants while taking into account the effects on people's livelihoods.

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“…The germinated seeds were counted from the day the experimentation began. For the germination, different variables were monitored namely: latent period (LP), final percentage germination (FPG), mean germination time (MGT), and germination rate (GR) (Ferradous, 2018;Montaño-Arias et al, 2021;Mwendwa et al, 2020).…”

Section: Germination Characteristicsmentioning

confidence: 99%

Argan (Argania spinosa (L.) Skeels) Bazı Termal Şok Ön İşlemleri Altında Tohum Çimlenmesi

ALI

HACHEMI

Moumni

et al. 2022

Kastamonu Üniversitesi Orman Fakültesi Dergisi

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Aim of study:The objective of this study was to optimize the germination of A. spinosa seeds after different physical pretreatments by thermal shock to establish a simple, effective, and less expensive procedure.Area of study: The study was conducted in the laboratory on seeds from four regions of Morocco (Aoulouz, Essaouira, Sidi Bou Othmane, and Boulaouane).Material and methods: The seeds were dried and stored. Before the launching of the experimental protocol, they were dehulled and applied each their pre-treatment for the four provenances. The pretreatment used are the following. C: control without thermal shock, HC1: freezing, HC2: hot water, HC3: freezing + hot water.Main results: The results showed that the onset of germination of argan seeds subjected to pretreatment HC3 was reduced by 2 days on mean compared to seeds that were subjected to pretreatment (C). The application of the cold or hot pretreatment allowed us to reach up to 82% of the final percentage of germination. However, the combination of two pretreatments allowed us to reach up to 100% of the final germination percentage.Highlights: Freezing combined with hot water significantly improved the germination of A. spinosa seeds. This pretreatment could be recommended in the nursery for practitioners.

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Effect of seasonality and light levels on seed germination of the invasive tree Maesopsis eminii in Amani Nature Forest Reserve, Tanzania

Cited by 11 publications

References 27 publications

Seed longevity and germination of the emerging invasive species wavyleaf basketgrass (Oplismenus undulatifolius) under varied light regimes

Seed longevity and germination of the emerging invasive species wavyleaf basketgrass (Oplismenus undulatifolius) under varied light regimes

InvasiveArgemone mexicana’s suppressive effects onPhaseolus vulgarisandZea maysgermination and growth

Argan (Argania spinosa (L.) Skeels) Bazı Termal Şok Ön İşlemleri Altında Tohum Çimlenmesi

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