scholarly journals Seed germination in Cerrado species

2008 ◽  
Vol 20 (3) ◽  
pp. 167-181 ◽  
Author(s):  
Lilian B. P. Zaidan ◽  
Rosana C. Carreira
Keyword(s):  
Seed Germination ◽  
Sulphuric Acid ◽  
Tree Species ◽  
Light Sensitivity ◽  
Dormancy Breaking ◽  
Shrub Species ◽  
Different Temperatures ◽  
Light Effects ◽  
And Storage ◽  
Herb Species

The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species show dormancy caused by impermeability of the seed tegument, as described for seeds of some species of Bauhinia. Their dormancy is broken by chemical scarification using sulphuric acid. Seeds of Heteropterys pteropetala are sensitive to very high temperatures, similar to those registered during burnings. Some species were considered to have allelopathic effects and could inhibit the germination of seeds of other species and the establishment of plantlets. Seeds of most tree species do not require light to germinate and the focus of the studies were on methods of dormancy breaking. Sulphuric acid and incisions in the tegument proved to be the most efficient methods to break dormancy. In general, the studies are limited to three major aspects: responses to light, effects of different temperatures and dormancy breaking. More studies are necessary to understand the physiological and biochemical aspects of reserve compounds and their mobilization during germination, as well as the effects of fire in these seeds.

scholarly journals Non-Deep Physiological Dormancy in Seed and Germination Requirements of Lysimachia coreana Nakai

Horticulturae ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 490
Author(s):  
Saeng Geul Baek ◽  
Jin Hyun Im ◽  
Myeong Ja Kwak ◽  
Cho Hee Park ◽  
Mi Hyun Lee ◽  
...  
Keyword(s):  
Seed Germination ◽  
Seed Dormancy ◽  
Germination Rate ◽  
Seed Viability ◽  
Cold Stratification ◽  
Dormancy Breaking ◽  
Viability Test ◽  
Physiological Dormancy ◽  
Different Temperatures ◽  
Germination Requirements

This study aimed to determine the type of seed dormancy and to identify a suitable method of dormancy-breaking for an efficient seed viability test of Lysimachia coreana Nakai. To confirm the effect of gibberellic acid (GA3) on seed germination at different temperatures, germination tests were conducted at 5, 15, 20, 25, 20/10, and 25/15 °C (12/12 h, light/dark), using 1% agar with 100, 250, and 500 mg·L−1 GA3. Seeds were also stratified at 5 and 25/15 °C for 6 and 9 weeks, respectively, and then germinated at the same temperature. Seeds treated with GA3 demonstrated an increased germination rate (GR) at all temperatures except 5 °C. The highest GR was 82.0% at 25/15 °C and 250 mg·L−1 GA3 (4.8 times higher than the control (14.0%)). Additionally, GR increased after cold stratification, whereas seeds did not germinate after warm stratification at all temperatures. After cold stratification, the highest GR was 56.0% at 25/15 °C, which was lower than the GR observed after GA3 treatment. We hypothesized that L. coreana seeds have a non-deep physiological dormancy and concluded that 250 mg·L−1 GA3 treatment is more effective than cold stratification (9 weeks) for L. coreana seed-dormancy-breaking.

scholarly journals Diversity of Angiospermic Plants in estuarine and Adjoining Riparian Areas of Sabarmati and Mahi Rivers, Gujarat, India

2020 ◽  
pp. 116-124
Author(s):  
Raj B. Patel ◽  
Ketan Tatu ◽  
R. D. Kamboj
Keyword(s):  
Tree Species ◽  
Flowering Plants ◽  
Grass Species ◽  
Riparian Zones ◽  
Ecological Groups ◽  
View Point ◽  
Riparian Areas ◽  
Shrub Species ◽  
Religious Importance ◽  
Herb Species

The present study was conducted with an aim of documenting the diversity of flowering plants in selected localities in the estuarine and adjoining riparian zones of Sabarmati and Mahi rivers of Gujarat, India. The Sabarmati and Mahi rivers are west-flowing perennial rivers having considerable ecological and religious importance. A total of 40 species of flowering plants belonging to 26 different families were recorded in the study area which were dominated by herbaceous plants. Among the 40 species recorded 2 species were trees, 8 species were shrubs, 28 species were herbs and 2 species were grasses. Moreover, as far as ecological groups are concerned, 6 species were halophytes, 13 species were hydrophytes, 17 species were mesophytes and 4 species were xerophytes. In the study area of Sabarmati river, 28 species were recorded that included 2 tree species, 6 shrub species, 18 herb species and 2 grass species. From the view point of ecological groups 5 species were halophytes, 3 species were hydrophytes, 16 species were mesophytes and 4 species were xerophytes. In the study area of Mahi river, 24 species were recorded that included 2 tree species, 6 shrub species, 14 herb species and 2 grass species. From the view point of ecological groups 5 species were halophytes, 12 species were hydrophytes, 5 species were mesophytes and 2 species were xerophytes.

scholarly journals Seed Germination of Enterolobium contortisiliquum (Vell.) Morong. (Fabaceae) under Different Temperatures and Drying Method

2021 ◽  
pp. 54-59
Author(s):  
Natália Marinho Silva Crisóstomo ◽  
Lorraynne Gabrielly Vieira dos Santos ◽  
Luan Danilo Ferreira de Andrade Melo ◽  
João Luciano de Andrade Melo Junior ◽  
Larice Bruna Ferreira Soares ◽  
...  
Keyword(s):  
Seed Germination ◽  
Moisture Content ◽  
Tree Species ◽  
Wood Quality ◽  
Initial Moisture Content ◽  
Drying Method ◽  
Plant Propagation ◽  
Agricultural Engineering ◽  
Fluorescent Lamps ◽  
Different Temperatures

Enterolobium contortisiliquum (Vell.) Morong a tree commonly known as anglerfish, monkey ear and timbaúva. Due to its wood quality, this tree species is widely used in naval and civil constructions, toys and furniture frames, and can also be used for urban afforestation and restoration of degraded areas. The objective of this work was to standardize the best temperature conditions for conducting the germination tests of E. contortisiliquum seeds under laboratory conditions, considering the fact that the seeds come from coastal tropical Brazil, and to evaluate the desiccation tolerance. The experiments were carried out at the Plant Propagation Laboratory of the Agricultural Engineering and Sciences Campus (CECA) of the Federal University of Alagoas (UFAL), located in the municipality of Rio Largo, Alagoas, Brazil. The design of the experiment was fully randomized, with four repetitions of 25 seeds per treatment. In test I: The newly harvested seeds were subjected to constant temperatures of 5, 10, 15, 20, 25, 30, 35 and 40ºC and alternating temperatures of 20-30ºC, with an eight-hour photoperiod, simulated by four fluorescent lamps 20W daylight type. In trial II: The seeds were divided into two lots. The first was the control (initial moisture content). The second was subjected to slow drying on silica gel. A constant temperature of 30ºC is recommended for the germination and vigor test of E. contortisiliquum seeds. The critical means water content for seeds of this species is below 5%.

scholarly journals Study of storage on seed germination of Chresta sphaerocephala DC. – Asteraceae

2021 ◽  
Vol 10 (9) ◽  
pp. e50110917893
Author(s):  
Amanda Domingas Ediodato de Sousa ◽  
Luciana Botezelli ◽  
Patrícia Neves Mendes
Keyword(s):  
Seed Germination ◽  
Storage Temperature ◽  
Morphological Difference ◽  
Seed Storage ◽  
Seed Vigor ◽  
Significance Level ◽  
Different Temperatures ◽  
And Storage ◽  
Storage Temperatures ◽  
Germinated Seeds

High-altitude fields have been subjected to an intense anthropization process. Due to this, studies on germination, seed storage and propagation of species that compose this plant formation become fundamental. Among such species is the Chresta sphaerocephala DC., Asteraceae. The purpose of this work was to study different temperatures for germination and storage of this species. Four germination temperatures (15°C, 20°C, 25°C and 30°C) and two storage temperatures (-5°C and +5°C) were tested. In order to assess seed vigor, the germination speed index (GSI) and average seed germination time were calculated. ANOVA and Tukey's test were performed at a 5% significance level. In addition, a morphological difference was observed in the analyzed Chresta sphaerocephala seeds, with these being classified as C1 (small seeds), C2 (long thin seeds), C3 (thicker seeds) and C4 (dark colored seeds). As for the storage temperature, 5°C was shown to be the best. When correlated with the germination temperature, 20°C resulted in a statistically higher number of germinated seeds.

EFFECTS OF STORAGE CONDITIONS AND PRESENCE OF FRUITING BRACTS ON THE GERMINATION OF ATRIPLEX HALIMUS AND SALSOLA VERMICULATA

1997 ◽  
Vol 33 (2) ◽  
pp. 149-155 ◽  
Author(s):  
A. E. OSMAN ◽  
F. GHASSALI
Keyword(s):  
Seed Germination ◽  
Cold Storage ◽  
North Africa ◽  
Room Temperature ◽  
Storage Temperature ◽  
Seed Storage ◽  
Storage Conditions ◽  
Shrub Species ◽  
Atriplex Halimus ◽  
Different Temperatures

Two shrub species, Atriplex halimus L. and Salsola vermiculata L., are considered useful for rehabilitation of degraded rangelands in west Asia and north Africa. They can be established from direct seeding and are capable of self-sowing. In this study, seed storage at different temperatures and the influence of fruiting bracts on seed germination were examined for the two species during two seasons. Fruits (utricles) were stored at 20–22°C (room temperature), 0°C or −22°C. Germination tests were carried out after 33, 56, 90, 152, 272 and 397 d in storage in the first season and after 44, 76, 104, 170, 288 and 412 d in the second season. Seeds were germinated in their fruiting bracts or after bract removal. Bract removal significantly improved seed germination of both shrubs regardless of storage temperature. For S. vermiculata the increase in germination was in the range of 1.3- to 14.7-fold compared with values for the intact fruit in Season 1 and 0.5 to 3.8 in Season 2. Similarly the ranges for A. halimus were 0.5- to 4.2-fold and 0.7- to 5.3-fold in the two seasons respectively. The effect of cold storage was greater on Salsola than on Atriplex. The reduction of the storage temperature from 21°C to 0°C and −22°C increased the longevity of S. vermiculata seeds by 2.8–46.6 times in Season 1 and by 2.9–2.6 times in Season 2. There was little or no effect on the longevity of A. halimus. A leachate prepared by soaking fruiting bracts from S. vermiculata significantly depressed germination (p < 0.01), the effect being greater on Salsola seeds (20% reduction) than on Atriplex seeds (8% reduction). A leachate from A. halimus produced a slight but non-significant reduction in germination.

scholarly journals Seed germination of Bowdichia virgilioides Kunth, under water stress

2001 ◽  
Vol 5 (1) ◽  
pp. 115-118 ◽  
Author(s):  
Lígia M. de M. Silva ◽  
Ivor B. de Aguiar ◽  
Teresinha de J.D. Rodrigues
Keyword(s):  
Water Stress ◽  
Seed Germination ◽  
Sulphuric Acid ◽  
Stress Resistance ◽  
Water Availability ◽  
Tree Species ◽  
Native Tree ◽  
Drought Conditions ◽  
Native Tree Species ◽  
Osmotic Potentials

Bowdichia virgilioides (Leguminosae-Papilionoideae) is a native tree species in Brazil characteristic of the savannah vegetation. Seeds of this species were submitted to different osmotic potentials induced by polyethyleneglycol (PEG-6000) in order to verify their resistance to drought conditions. Seeds were previously scarified with sulphuric acid and incubated at 25 ºC with an eight hours photoperiod, at osmotic potentials of 0.0, -0.1, -0.3, -0.5, -0.7, -0.9 and -1.1 MPa. It was found that water stress resistance limit ranged from -0.7 to -0.9 MPa. Significant reduction in germination velocity from -0.3 MPa, and final percentage of germination from -0.5 MPa in relation to control, were observed. Germination under drastic conditions of water stress was inhibited, but was restored with an increase of water availability.

scholarly journals Seed germination and seedling vigour of italian ryegrass, cocksfoot and timothy following harvest and storage

2011 ◽  
Vol 35 (6) ◽  
pp. 1141-1148 ◽  
Author(s):  
Rade Stanisavljevic ◽  
Dragoslav Ðjokic ◽  
Jasmina Milenkovic ◽  
Lana Ðukanovic ◽  
Vladeta Stevovic ◽  
...  
Keyword(s):  
Seed Germination ◽  
Lolium Multiflorum ◽  
Germination Percentage ◽  
Italian Ryegrass ◽  
Ambient Conditions ◽  
Dormancy Breaking ◽  
Storage Duration ◽  
Seedling Vigour ◽  
Sowing Time ◽  
And Storage

During post-harvest maturation, different species vary in the length of dormancy breaking or germination increases. Seed dormancy and slow seedling development often limit establishment of forage grass stands. Seed germination and seedling vigour of Italian ryegrass (Lolium italicum A. Braun, Synonym Lolium multiflorum L.), cocksfoot (Dactylis glomerata L.) and timothy (Phleum pretense L.) were observed after harvest and storage. After harvest in June, seeds were stored under standard storage conditions and sampled every 30 days after harvest (DAH), up to 270 DAH, and then every 60 days up to 990 DAH. At each date, seeds were tested for final germination percentage and for seedling vigour traits. Timothy seeds had a maximum germination (88%) and the best seedlings vigour at 90 DAH, which implies that early autumn (September-October) is the best sowing period for freshly harvested seeds of timothy. Timothy seed germination was poor from 270 DAH (73%). The best germination and vigour of Italian ryegrass and cocksfoot seedlings were between 270 and 330 DAH, which equates to spring sowing time (March-April) in the succeeding year. Cocksfoot and Italian ryegrass seeds maintained satisfactory germination levels up to 630 DAH (81%) and 810 DAH (81%), respectively. The data can serve for the determination of a proper storage duration management between harvest and sowing of the tested species under ambient conditions of south-eastern Europe.

scholarly journals Status and Diversity of Terrestrial plants in Ghodaghodi Lake Complex, Nepal

2021 ◽  
Vol 9 (1) ◽  
pp. 38-44
Author(s):  
Ramesh Bhandari ◽  
Mahamad Sayab Miya ◽  
Sachin Timilsina
Keyword(s):  
Tree Species ◽  
Hot Spot ◽  
Terrestrial Plants ◽  
Shrub Species ◽  
The Family ◽  
The Status ◽  
Aerva Lanata ◽  
The Right ◽  
Important Value Index ◽  
Herb Species

Among the Ramsar sites of Nepal, Ghodaghodi Lake Complex (GLC) is a biodiversity hot spot. This study was carried out to assess the status and diversity of terrestrial plants in GLC. Employing purposive sampling, altogether 38 plots were taken along the right hand side of the foot trails around the GLC. Collected data were analyzed using formulas and Important Value Index (IVI) was calculated. A total of 50 terrestrial species from 27 families were recorded, among which 35 were trees, 8 shrubs, and 7 herbs. Terminalia tomentosa (Saj) has highest IVI (46.53) among tree species. Similarly, Aerva lanata (Khari) has highest IVI (54.13) among herb species and Calotropis gigantea (Aank) has highest IVI (68.56) among the shrub species. The family Fabaceae family (n=7) represented the maximum numbers of plants species followed by Moraceae family. Int. J. Appl. Sci. Biotechnol. Vol 9(1): 38-44

scholarly journals Seed germination studies on Gymnacranthera canarica (King) Warb. - a Vulnerable tree species of a highly threatened Myristica swamp ecosystem

2016 ◽  
Vol 8 (7) ◽  
pp. 9009 ◽  
Author(s):  
K. Keshavachandra ◽  
G. Krishnakumar
Keyword(s):  
Seed Germination ◽  
Moisture Content ◽  
Tree Species ◽  
Western Ghats ◽  
Initial Moisture Content ◽  
Moisture Level ◽  
Critically Endangered ◽  
Ecosystem Studies ◽  
And Storage ◽  
The Western Ghats

Gymnacranthera canarica (King) Warb. is an exclusive Myristica swamp species endemic to the Western Ghats.  The Myristica swamp is a Critically Endangered ecosystem.  Studies were carried out to assess the viability, germination and storage behaviour of Gymnacranthera canarica seeds.  In the present study, it was observed that seeds have shown an initiation of germination after two weeks.  A maximum of 90% germination was recorded when the initial moisture content was 38.04 ± 1.75 %.  A decreased percentage (3%) was observed when the moisture content reached 14.26 ± 2.3 after 70 days of storage.  Seeds failed to germinate beyond this moisture level.  A desiccation study showed recalcitrant behaviour and seeds can be stored in lab conditions for up to two and half months.

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