scholarly journals Germination and Early Seedling Growth of Rare Zamia spp. in Organic and Inorganic Substrates: Advancing Ex Situ Conservation Horticulture

HortScience ◽  
2010 ◽  
Vol 45 (4) ◽  
pp. 679-683 ◽  
Author(s):  
Claudia Calonje ◽  
Chad Husby ◽  
Michael Calonje
Keyword(s):  
Germination Rate ◽  
Leaf Length ◽  
Dry Forest ◽  
Silica Sand ◽  
Ex Situ ◽  
Inorganic Substrates ◽  
Early Seedling ◽  
Survival And Growth ◽  
Propagation Methods ◽  
Germination And Growth

Improved propagation methods greatly benefit conservation of rare cycads. Appropriate substrate conditions, especially excellent root aeration, are crucial to successful cultivation of most cycads. Typical cycad substrates include substantial portions of organic materials that will decompose over time, reducing drainage and increasing water retention. In this study, two inorganic substrates, arcillite (Turface® MVP®) and coarse silica sand, and one mixed cycad substrate (with organic and inorganic components) were evaluated for germination and growth of three rare Zamia species: Z. fairchildiana L.D. Gómez, Z. cunaria Dressler & D.W. Stev., and Z. aff. portoricensis Urb. over a period of 14 months from seed sowing. Substrate type affected leaves per seedling and leaf length. These factors also varied by species as did taproot length and germination rate. There were also significant interactions between substrate and species for caudex diameter and leaf variables, likely reflecting ecological differences among the species, two of which are from rainforest habitats and one from dry forest. All three substrates performed adequately for germination, survival, and growth of Zamia. Turface® and possibly the silica sand likely require additional watering to improve their performance as cycad substrates.

scholarly journals Zinc Seed Priming Improves Spinach Germination at Low Temperature

Agriculture ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 271
Author(s):  
Muhammad Imran ◽  
Asim Mahmood ◽  
Günter Neumann ◽  
Birte Boelt
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Multispectral Imaging ◽  
Germination Rate ◽  
Cost Effective ◽  
Seed Priming ◽  
Seedling Development ◽  
Low Temperature Stress ◽  
Early Seedling ◽  
Early Seedling Development

Low temperature during germination hinders germination speed and early seedling development. Zn seed priming is a useful and cost-effective tool to improve germination rate and resistance to low temperature stress during germination and early seedling development. Spinach was tested to improve germination and seedling development with Zn seed priming under low temperature stress conditions. Zn priming increased seed Zn concentration up to 48 times. The multispectral imaging technique with VideometerLab was used as a non-destructive method to differentiate unprimed, water- and Zn-primed spinach seeds successfully. Localization of Zn in the seeds was studied using the 1,5-diphenyl thiocarbazone (DTZ) dying technique. Active translocation of primed Zn in the roots of young seedlings was detected with laser confocal microscopy. Zn priming of spinach seeds at 6 mM Zn showed a significant increase in germination rate and total germination under low temperature at 8 °C.

scholarly journals Contribution to study of Acacia tortilis subsp raddiana seed germination, and growth seedling under different osmotic and drought constraints

2013 ◽  
Vol 70 (1) ◽  
pp. 227-234
Author(s):  
Salima KEBBAS ◽  
Stanley LUTTS ◽  
Fatiha AID
Keyword(s):  
Rural Economy ◽  
Germination Rate ◽  
Calorific Value ◽  
Stress Effect ◽  
Acacia Tortilis ◽  
Stem Height ◽  
Strong Negative Correlation ◽  
Kitchen Utensil ◽  
Craft Industry ◽  
Germination And Growth

Acacia raddiana or Acacia tortilis (Forsk) Hyane subsp. raddiana (Savi) Bernan, (Fabaceae) is characterized by a great ecological plasticity. It is largely used by the local populations as medicinal plants, fodder, wood energy, coal because it high calorific value. This plant thus plays a big role in rural economy because it is also appreciated in craft industry and for the clothes, tools and kitchen utensil manufacture. The study of the intensity osmotic stress effect on the germination of Acacia raddiana seeds reveals that there is a very strong negative correlation between the increase of the concentration of PEG and the germination rate (r = -0.9251). The fact remains that in spite of very small negative potential, Acacia raddiana seeds are very resistant since it coming to sprout at potential matching -6.0 MPa. In otherwise, the foliar  RWC of seedling remained stable during the 25 days of treatment at about 81.61 ± 7.61% (control) and dropped from 17th to 25th day at 32% (stressed). The growth was also affected by stress. Thus, both leaves number and stem height is reduced in stressed plants compared to controls.

scholarly journals Seedling Survival and Growth of Tree Species: Site Condition and Seasonality in Tropical Dry Forest Restoration

2014 ◽  
Vol 90 (3) ◽  
pp. 313
Author(s):  
CLAUDIA ALVAREZ-AQUINO ◽  
GUADALUPE WILLIAMS-LINERA
Keyword(s):  
Forest Restoration ◽  
Seedling Survival ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Cedrela Odorata ◽  
Guazuma Ulmifolia ◽  
Survival And Growth ◽  
Tabebuia Rosea ◽  
Dry Forest Restoration ◽  
Ceiba Aesculifolia

La restauración del bosque tropical seco es prioritaria por ser el bosque más amenazado. En Veracruz, el bosque seco se ha reducido al 7% de su cobertura original. Nuestro objetivo fue determinar el efecto de la condición del sitio a restaurar y la estacionalidad en la supervivencia y tasa de crecimiento relativo en altura y diámetro de especies de árboles nativos. Estudiamos el desempeño de plántulas durante dos estaciones secas y dos lluviosas, y el efecto de la vegetación leñosa existente > 1 m de altura. Se trasplantaron 960 plantas: 40 individuos de seis especie (Cedrela odorata, Ceiba aesculifolia, Guazuma ulmifolia, Ipomoea wolcottiana, Luehea candida, Tabebuia rosea) en cuatro sitios abandonados. La supervivencia y la tasa de crecimiento relativo se registraron cada cuatro meses durante dos años. La mayor supervivencia se observó en sitios con mayor riqueza de especies arbóreas y la tasa de crecimiento relativo en altura estuvo positivamente correlacionada con la altura de la vegetación existente. La mayor tasa de crecimiento relativo para especies y sitios se registró durante la estación lluviosa. En el sitio con menos vegetación, el desempeño de las plántulas fue pobre y sólo Guazuma sobrevivió. Ceiba mostró la mayor supervivencia (82-90%) pero una tasa de crecimiento relativo baja; Guazuma presentó una supervivencia elevada (20-94%) y la mayor tasa de crecimiento relativo; Cedrela mostró la menor supervivencia (3-7%) y tasa de crecimiento relativo alta. Los resultados sugieren que la vegetación del sitio, la estacionalidad y las especies afectan el desempeño de las plántulas durante el establecimiento temprano. La implicación en términos de la restauración ecológica es la importancia de aprovechar la vegetación existente aunque ésta sea escasa.

High seed viability recorded in an endangered endemic species, 'Isoplexis isabelliana' (Scrophulariaceae), after more than 30 years of storage in a conservation seed bank

2021 ◽  
Vol 42 ◽  
pp. e69341
Author(s):  
Miguel Ángel González Pérez ◽  
Nereida Cabrera-García ◽  
Isabel Cayon-Fernández
Keyword(s):  
Seed Bank ◽  
Germination Rate ◽  
Genetic Material ◽  
Natural Populations ◽  
Seed Viability ◽  
Seed Storage ◽  
Botanical Garden ◽  
Storage Conditions ◽  
Seed Banks ◽  
Ex Situ

Conservation seed banks are essential for ex-situ conservation of genetic biodiversity. These institutions are especially relevant for threatened species and play a vital role in their conservation by preserving genetic material. However, samples deposited in the seed banks must germinate when necessary to use them (i.e., recovery plans, etc.). This study uses four accessions of the endemic endangered species from Gran Canaria Island (Canary Islands), Isoplexis isabelliana (Webb & Berthel.) Masf. (Scrophulariaceae). Germination tests were carried out to measure seed viability through time and the possible impact of seed storage on their viability. These accessions have been kept in the seed bank for four months to thirty years under different storage conditions. Germination results differed for seeds after 45 days of exposition using 16 hours light and 8 hours darkness at 17 °C. Accessions kept in the seed bank, independently of storage, showed a high germination percentage (89%). Whereas the accessions with rough storage conditions showed a 0% germination rate. The results highlighted the good state of conservation of the material deposited in the Seed Bank of the Botanical Garden "Viera y Clavijo" and the reliability of the temperature and humidity conditions in which the seeds of I. isabelliana have been stored. We consider these results as momentous since several natural populations of I. isabelliana has been affected by the last forest fire on the island.

scholarly journals Effect of Environmental Factors on Seed Germination and Early Seedling Emergence of Carolina geranium (Geranium carolinianum)

2018 ◽  
Vol 36 ◽  
Author(s):  
X. LIU ◽  
T. ZONG ◽  
Y. LI ◽  
X. ZHOU ◽  
L. BAI
Keyword(s):  
Control Strategies ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Burial Depth ◽  
Invasive Weed ◽  
Temperature Regimes ◽  
Dark Regime ◽  
Early Seedling ◽  
Effects Of Temperature ◽  
And Control

ABSTRACT: Carolina geranium (Geranium carolinianum) is an emerging invasive weed in rape and wheat fields in China. A better understanding of its germination and emergence ecology will enable the development of integrated weed control strategies. In this study, we investigated the effects of temperature, photoperiod, soil water content, salinity, and burial depth, on germination and emergence of Carolina geranium. Germination percentages were over 74% under 15/20 and 20/25 oC night/day temperature regimes. Germination rate was independent of light/dark regime. Increasing salinity reduced germination of Carolina geranium from 81.1% at 0 mM to 0% at 160 mM NaCl. Seeds germination was peaked at 50% soil moisture, but was completely inhibited at < 20% and > 90%. The seedling emergence above 82.2% was observed when seeds were placed at a depth from 0 to 1 cm, and no seedlings emerged from seeds placed at a depth of 7 cm. Current work provide the basic information to effectively prevent and control this invasive weed in Chinese rape and wheat fields.

Effect of light on germination of seeds of Cactaceae from the Chihuahuan Desert, Mexico

2006 ◽  
Vol 16 (2) ◽  
pp. 149-155 ◽  
Author(s):  
Joel Flores ◽  
Enrique Jurado ◽  
Alberto Arredondo
Keyword(s):  
At Risk ◽  
Chihuahuan Desert ◽  
Soil Seed Bank ◽  
Germination Rate ◽  
Ex Situ ◽  
Continuous Darkness ◽  
Secondary Dormancy ◽  
Large Numbers ◽  
Persistent Soil Seed Bank ◽  
Effect Of Light

In the Chihuahuan Desert, there are many cacti species considered to be at risk due to illegal extraction, land-use change and overgrazing. To reduce their illegal extraction,ex situplant propagation has been suggested. However, the literature regarding seed germination biology of these species is scarce. We investigated the effect of light on germination percentages and germination rate (t50) in seeds of 28 cactus species from the Chihuahuan Desert. Seeds were incubated at a 14-h daily photoperiod (light) and in continuous darkness at 25°C for 30 d, after which seeds failing to germinate in darkness were transferred to light for 30 d. Only 11 of the species had non-dormant seeds, germinating ≥70% in the light; thus an evaluation of the effect of light versus darkness on germination was confined to them. All species were positively photoblastic, and all of them had seeds weighing <1 mg. Ten species did not germinate in darkness, and one species had only 7% germination. From these 11 species, 8 did not germinate to a significantly higher percentage when the same set of seeds was transferred from dark to light, suggesting that darkness had triggered secondary dormancy (skotodormancy). To our knowledge, these results are the first to show that darkness triggers secondary dormancy in cacti. Implications of having a light requirement for germination and having small seeds to accumulate a persistent soil seed bank are discussed. These results contribute to understanding the germination biology of cactus species at risk, and could enhance the propagation of large numbers of cultivated individuals outside their habitats, promotingex situconservation.

scholarly journals Inducing salt tolerance in sweet corn by magnetic priming

2017 ◽  
Vol 109 (1) ◽  
pp. 89 ◽  
Author(s):  
Soheil Karimi ◽  
Saeid ESHGHI ◽  
Saeid KARIMI ◽  
Saman HASAN-NEZHADIAN
Keyword(s):  
Salt Stress ◽  
Seed Germination ◽  
Plant Growth ◽  
Sweet Corn ◽  
Germination Rate ◽  
Nacl Stress ◽  
Proline Accumulation ◽  
Membrane Thermostability ◽  
Germination And Growth ◽  
Magnetic Priming

<p>This study evaluates seed germination and growth of sweet corn under NaCl stress (0, 50, and 100 mM), after exposing the seeds to weak (15 mT) or strong (150 mT) magnetic fields (MF) for different durations (0, 6, 12, and 24 hours). Salinity reduced seed germination and plant growth. MF treatments enhanced rate and percentage of germination and improved plant growth, regardless of salinity. Higher germination rate was obtained by the stronger MF, however, the seedling were more vigorous after priming with 15 mT MF. Proline accumulation was observed in parallel with the loss of plant water content under 100 mM NaCl stress. MF prevented proline accumulation by improving water absorption. Positive correlation between H<sub>2</sub>O<sub>2</sub> accumulation and membrane thermostability (MTI) was found after MF treatments, which revealed that MF primed the plant for salinity by H<sub>2</sub>O<sub>2</sub> signaling. However, over-accumulation of H<sub>2</sub>O<sub>2</sub> after prolonged MF exposure adversely affected MTI under severe salt stress. In conclusion, magnetic priming for 6 hours was suggested for enhancing germination and growth of sweet corn under salt stress.</p>

Heteromorphism in seeds ofLeptocereus scopulophilus(Cactaceae) from Pan de Matanzas, Cuba

2017 ◽  
Vol 27 (4) ◽  
pp. 311-320 ◽  
Author(s):  
José Angel García-Beltrán ◽  
Duniel Barrios ◽  
Alina Cuza-Pérez
Keyword(s):  
Germination Rate ◽  
Border Region ◽  
Ex Situ ◽  
Seed Collection ◽  
Morphological Variations ◽  
Formation Of Cracks ◽  
Periclinal Walls ◽  
Cuticle Thickness ◽  
Seed Coats ◽  
Seed Heteromorphism

AbstractSeed heteromorphism is the formation of different seed morphs from the same individual. Two seed morphs have been preliminarily observed inLeptocereus scopulophilus. One morph shows an apparent natural scarification of its coat. Herein we describe the seeds, taking into account shape, coat integrity, surface, dimensions, mass and the position of germination cracks. We defined two seed morphs using the integrity of the spermoderma: fragmented seed coats (FSC) and complete seed coats (CSC). We also evaluated minimum germination time, germination rate and germinability. The seed morphs did not differ significantly in traits; however, regular striations along the cuticle of the periclinal walls were more visible in the FSC compared with the CSC. Both seed morphs displayed anticlinal cell boundaries in the border region that are channelled and straight in the dorsal-ventral region but difficult to define in the lateral region. We found four morphological variations in different positions where the radicle or cotyledons emerge and variations in cuticle thickness in different regions of the seed that could determine the formation of cracks during germination. All germination variants occurred in both seed morphs, albeit in different proportions. Germination was higher and faster for the FSC compared with the CSC. These germination differences could be related to a thinner cuticle in the FSC and the punctual release of its spermoderma, which facilitates a quick imbibition of the embryo and the breaking of the seed coat. Our results indicate that differences in germination parameters between the two seed morphs relate to differences in the percentage of dormant seeds, which favour the temporal expansion of germination and reduce competition between siblings. To propagate the species for conservation purposes, we recommend using FSC, while CSC may be used to establish a seed collectionex situ.

scholarly journals Germination and growth of ornamental pepper plants due to salinity

2018 ◽  
Vol 39 (1) ◽  
pp. 61
Author(s):  
Angela Maria dos Santos Pessoa ◽  
Elizanilda Ramalho do Rêgo ◽  
Marcelo Pereira Cruz ◽  
Cristine Agrine Pereira dos Santos ◽  
Priscila Duarte Silva ◽  
...  
Keyword(s):  
Capsicum Annuum ◽  
Leaf Length ◽  
Leaf Width ◽  
Seedling Height ◽  
In Vitro Germination ◽  
Fresh Matter ◽  
Cotyledonary Leaf ◽  
Germination And Growth ◽  
Descriptive Statistical Analysis

Seeds need favorable environmental conditions to germinate but sometimes these conditions are not available. The goal of this work was to evaluate the influence of different concentrations of NaCl on in vitro germination and development of Capsicum annuum seedlings. The experiment was conducted at the Laboratório de Biotecnologia Vegetal at Centro de Ciências Agrárias (CCA) of Universidade Federal da Paraíba (UFPB), Areia, PB, Brazil. Ornamental pepper seeds (Capsicum annuum L.) were submitted to five concentrations of NaCl: 0, 25, 50, 75 and 100 mM. The experimental design was completely randomized, with five treatments and seven replicates, each replicate consisted of one flask with one seed. After 14 days in vitro, the germinated seedlings were characterized for seedling height, hypocotyl width, cotyledon leaf length, cotyledon leaf width, leaf number, radicle length, fresh matter and germination. The data were submitted to analysis of variance by the F test ( p ≤ 0.05). When significant differences were detected, the data were submitted to regression analysis. Percentage of abnormal plantlets was also calculated and submitted to descriptive statistical analysis. The percentage of germination was not affected by the NaCl concentrations used in this work. However 75 e 100 mM salt concentrations influenced the cotyledonary leaf width, total fresh matter and percentage of abnormal seedlings.

Sign in / Sign up

Export Citation Format

Share Document