scholarly journals Organic Compounds: Contents and Their Role in Improving Seed Germination and Protocorm Development in Orchids

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Edy Setiti Wida Utami ◽  
Sucipto Hariyanto
Keyword(s):  
Seed Germination ◽  
Organic Compounds ◽  
Mycorrhizal Fungi ◽  
Scientific Literature ◽  
Culture Media ◽  
Germination Rate ◽  
Shoot Formation ◽  
Multiple Shoot ◽  
Seedling Development

In nature, orchid seed germination is obligatory following infection by mycorrhizal fungi, which supplies the developing embryo with water, carbohydrates, vitamins, and minerals, causing the seeds to germinate relatively slowly and at a low germination rate. The nonsymbiotic germination of orchid seeds found in 1922 is applicable to in vitro propagation. The success of seed germination in vitro is influenced by supplementation with organic compounds. Here, we review the scientific literature in terms of the contents and role of organic supplements in promoting seed germination, protocorm development, and seedling growth in orchids. We systematically collected information from scientific literature databases including Scopus, Google Scholar, and ProQuest, as well as published books and conference proceedings. Various organic compounds, i.e., coconut water (CW), peptone (P), banana homogenate (BH), potato homogenate (PH), chitosan (CHT), tomato juice (TJ), and yeast extract (YE), can promote seed germination and growth and development of various orchids. They also stimulate seedling development, formation of protocorm-like bodies (PLBs), plantlet growth, and multiple shoot formation. The addition of organic compounds to culture media, individually or in combination, accelerates seed germination and seedling development. Different types and concentrations of organic nutrients are needed for the success of in vitro cultures, depending on the species and genotype.

scholarly journals In vitro Embryo Morphogenesis and Micropropagation of Dendrobium aggregatum Roxb.

2014 ◽  
Vol 23 (2) ◽  
pp. 241-249 ◽  
Author(s):  
Mohammad Musharof Hossain
Keyword(s):  
Seed Germination ◽  
Plant Growth ◽  
Developmental Stages ◽  
Cell Mass ◽  
Multiple Shoot ◽  
Seedling Development ◽  
Ms Medium ◽  
Multiple Shoot Buds ◽  
Half Strength

In vitro embryo morphogenesis and micropropagation of Dendrobium aggregatum Roxb. were described. The gradual developmental stages of embryos to seedlings were traced out. Within two weeks of culture the cells of undifferented embryos underwent repeated aniclinal and periclinal division producing a compact, green parenchymatous cell mass called spherule that emerged out by rupturing the testa. The spherules subsequently differentiated into greenish protocorms were considered as typical seed germination. Germination occurred on both (MS and Phytamax (PM) medium but MS medium proved to be more efficient. The primary protocorms underwent profuse proliferation through production of secondary (2º) protocorms when transferred to different plant growth regulators (PGRs) supplemented MS; the medium fortified with 2.0 mg/l BAP and 1.0 mg/l NAA proved to be most effective for induction of 2º protocorms and seedling development. Multiple shoot buds (MSBs) were induced in pseudobulb segments of the in vitro grown seedlings when cultured on different PGRs supplemented media; and the maximum number of MSBs were obtained MS + 2.0 mg/l BAP + 0.5 mg/l picloram. The MSBs underwent elongation and then they rooted when they were transferred to half strength of MS + 0.5 mg/l IAA. The well rooted plantlets were finally transferred to outside natural environment with 80% survival. D. O. I. http://dx.doi.org/10.3329/ptcb.v23i2.17525 Plant Tissue Cult. & Biotech. 23(2): 241-249, 2013  (December)

scholarly journals Precocious flowering of plants resulting from in vitro germination of Cycnoches haagii seeds on mycorrhizal fungi presence

2018 ◽  
Vol 48 (4) ◽  
pp. 468-475 ◽  
Author(s):  
Mateus de Aguiar Torrezan ◽  
Manoela Aparecida Vieira da Silva ◽  
Vespasiano Borges de Paiva Neto ◽  
Daly Roxana Castro Padilha ◽  
Alana Juliete da Silva Santos
Keyword(s):  
New Media ◽  
Mycorrhizal Fungi ◽  
Culture Media ◽  
Germination Rate ◽  
Mycorrhizal Fungus ◽  
First Year ◽  
Fresh Matter ◽  
Precocious Flowering ◽  
Brazilian Savannah

ABSTRACT Cycnoches haagii is an epiphytic Orchidaceae found in the Brazilian Savannah that presents a great ornamental potential. Aiming at developing a complete seminal propagation protocol of C. haagii, as well as testing the influence of the mycorrhizal fungi presence in the process, mature seeds were germinated in vitro in the presence or absence of two fungal isolates, both belonging to the Tulasnella genus (FCH and FHC3E), in three culture media (B&G, Knudson and OMA). The percentage of germinated seeds was evaluated, and the protocorms of the four media with higher percentages were transferred to a new media, aiming at the conversion into plantlets. The seedlings were evaluated for shoot length, number of leaves, length of the largest root, number of roots and total fresh matter. The B&G medium provided a germination rate higher than 60 %, besides a higher seedling growth, contributing to 100 % of survival in the acclimatization stage, independently of the mycorrhizal fungi presence. However, only the seedlings from the B&G medium inoculated with the isolated FHC presented a fast growth when acclimatized, and flowering at the end of the first year of acclimatization. Therefore, the presence of the mycorrhizal fungus FHC on the B&G medium, during the germination phase, is adequate for the propagation of C. haagii, because it accelerates its development and anticipates the ex vitro flowering.

scholarly journals Effects of light, agar, activated charcoal, and culture medium on the germination and early development of Dendrobium seedlings

2020 ◽  
pp. 557-564
Author(s):  
José Carlos Sorgato ◽  
Jackeline Schultz Soares ◽  
Cláudia Roberta Damiani ◽  
Luan Marlon Ribeiro
Keyword(s):  
White Light ◽  
Activated Charcoal ◽  
Culture Media ◽  
Germination Rate ◽  
Seedling Development ◽  
Light Conditions ◽  
Early Seedling ◽  
Dendrobium Nobile Lindl ◽  
Early Seedling Development

The objectives of this study were to determine the optimal light conditions, agar concentration, and quantity of activated charcoal in asymbiotic media to improve the in vitro seed germination rate and early seedling development of the epiphytic orchids Dendrobium nobile Lindl. and Dendrobium phalaenopsis Fitzg. Two independent experiments with complete randomized designs were conducted. (1) Treatments were arranged in a split-plot scheme. Seeds in each sub-plot were exposed to one of four light conditions (dark, white fluorescent, red fluorescent + white fluorescent, or red fluorescent) and grown in one of four types of culture media (MS: Murashige and Skoog, ½ MS: half strength MS, K: Knudson C, and VW: Vacin and Went media). (2) Treatments were arranged in a 4 × 5 × 5 factorial scheme (four types of culture media: MS, ½ MS, K, and VW; five concentrations of agar: 0.0, 2.0, 4.0, 6.0, or 8 g L−1; and five concentrations of activated charcoal: 0.0, 1.5, 3.0, 4.5, or 6.0 g L−1). The highest germination rates and early seedling development were observed 45 days after seeding in the presence of white light for D. nobile and red + white light for D. phalaenopsis in MS and ½ MS culture media. Based on the findings of the present study, the use of MS and ½ MS culture media solidified with 4.0–8.0 g L−1 of agar and without activated charcoal is recommended for the optimal propagation of seeds and seedlings of these Dendrobium species.

scholarly journals In Vitro Seed Germination and Seedling Development of a Rare Indonesian Native Orchid Phalaenopsis amboinensis J.J.Sm

Scientifica ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Edy Setiti Wida Utami ◽  
Sucipto Hariyanto
Keyword(s):  
Survival Rate ◽  
Seed Germination ◽  
Culture Media ◽  
Natural Populations ◽  
Dry Weight ◽  
Seedling Development ◽  
Cut Flower ◽  
Commercial Exploitation ◽  
Propagation Methods

Phalaenopsis amboinensis, an epiphytic orchid, has a great potential for commercial exploitation in the cut-flower industry. It is difficult to propagate vegetatively as it naturally grows slowly. Therefore, there is a need to improve the propagation methods to avoid endangering its natural populations. The objective of this study was to identify the best medium and organic supplements for seed germination and plantlets development of P. amboinensis. Seeds from 4-month-old hand-pollinated orchids were sown on different strengths of MS and VW culture media: Murashige and Skoog (MS), 1/2 MS, Vacin and Went (VW), and 1/2 VW. Optimum seed germination, i.e., 90.7%, was achieved on VW medium. VW medium was suitable for seedling formation and allowed 51.4% of seedling development from protocorm within 10 weeks of culture. When 15% (v/v) coconut water was added together with banana homogenate (10 g·L−1) to the VW medium, the plantlets grew to the highest length and had the highest dry weight (62.1 mm and 15.5 g, respectively). The roots and leaves of the plantlets grew vigorously in this medium. Plants regenerated via in vitro seed germination processes were successfully acclimatized in greenhouse conditions, and the survival rate was more than 85%.

scholarly journals Accelerating Seed Germination and Juvenile Growth of Sorghum (Sorghum bicolor L. Moench) to Manage Climate Variability through Hydro-Priming

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 419
Author(s):  
Siaka Dembélé ◽  
Robert B. Zougmoré ◽  
Adama Coulibaly ◽  
John P. A. Lamers ◽  
Jonathan P. Tetteh
Keyword(s):  
Seed Germination ◽  
Climate Variability ◽  
Germination Rate ◽  
Dry Weight ◽  
Seed Priming ◽  
Seedling Development ◽  
Hot Water ◽  
Crop Failure ◽  
Simple Method ◽  
Early Season

Agriculture in Mali, a country in Sahelian West Africa, strongly depends on rainfall and concurrently has a low adaptive capacity, making it consequently one of the most vulnerable regions to climate change worldwide. Since early-season drought limits crop germination, and hence growth, ultimately yield during rain-fed depending on production is commonly experienced nowadays in Mali. Germination and establishment of key crops such as the staple sorghum could be improved by seed priming. The effects of hydro-priming with different water sources (e.g., distilled, tap, rain, river, well water) were evaluated respectively for three priming time durations in tepid e.g., at 25 °C (4, 8, and 12 h) and by hot water at 70 °C (in contrast to 10, 20, and 30 min.) in 2014 and 2015. Seed germination and seedling development of nine sorghum genotypes were monitored. Compared to non-primed seed treatments, hydro-priming significantly [p = 0.01] improved final germination percentage, germination rate index, total seedling length, root length, root vigor index, shoot length, and seedling dry weight. The priming with water from wells and rivers resulted in significant higher seed germination (85%) and seedling development, compared to the three other sources of water. Seed germination rate, uniformity, and speed were enhanced by hydro-priming also. It is argued that hydro-priming is a safe and simple method that effectively improve seed germination and seedling development of sorghum. If used in crop fields, the above most promising genotypes may contribute to managing early season drought and avoid failure of seed germination and crop failure in high climate variability contexts.

Control of browning during seed germination of Meizotropis pellita: a rare and an endangered plant

2021 ◽  
Vol 16 (8) ◽  
pp. 118-120
Author(s):  
Renu Chandola ◽  
Anshulika Upadhyaya
Keyword(s):  
Seed Germination ◽  
Culture Media ◽  
Light Condition ◽  
Endangered Plant ◽  
In Vitro Germination ◽  
Light Conditions ◽  
Low Intensity ◽  
Browning Reaction ◽  
Threatened Plant Species

Meizotropis pellita is a rare, endangered and threatened plant species found in Patwadanger forest. In nature this species grows from rootstock in precise and sensitive habitats. However, phenolic compounds provoke browning reaction which is responsible for lethal browning in plant tissue culture and hindering in vitro germination. The aim of this study was to minimize the effect of phenolic compound during seed germination. We evaluate different antibrowning treatments in Meizotropis pellita seeds. The seeds were pretreated in Polyvinylpyrrolidone and then treated seeds were cultured on MS media and sterilized seeds were directly inoculated on PVP containing MS media. These culture media incubate under dark and light conditions at different durations respectively. Our results showed that addition of antibrowning agent, PVP inhibit onset of browning. Dark and light condition also played a crucial role on onset of browning. Delayed and low intensity of browning were observed in case of seeds that were inoculated on MS media containing PVP and were kept in dark. The present research offers a positive in vitro seed germination protocol for Meizotropis pellita conservation.

scholarly journals Muskmelon seed germination and seedling development in response to seed priming

2003 ◽  
Vol 60 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Warley Marcos Nascimento
Keyword(s):  
Seed Germination ◽  
Cucumis Melo ◽  
Germination Rate ◽  
Fungal Growth ◽  
Seed Priming ◽  
Seedling Development ◽  
Factors Affecting ◽  
Total Seed ◽  
Cucumis Melo L ◽  
Osmotic Potentials

Important factors affecting seed priming have not been extensively reported in muskmelon (Cucumis melo L.) studies. The optimization of the seed priming technique becomes very important at the commercial scale. Little information has been reported on seedling development of muskmelon subsequent to seed priming. Seeds of muskmelon were primed in darkness at 25°C in different solutions and three osmotic potentials. Seeds were also primed with and without aeration during different periods. In relation to osmotic solutions, an osmotic potential around -1.30 MPa is most adequate for muskmelon priming. Salt solutions gave better germination rate but were deleterious for seed germination, especially at higher osmotic potentials. Aeration of the soaking salt solution gave faster germination at 17°C, and because of the early germination, these treatments probably presented a better seedling development. Deleterious effect on total seed germination was observed for long soaking periods with aeration. Fungal growth increased on seeds primed in aerated solutions. Seeds from priming treatments had a better germination rate and seedling development under 17 and 25°C.

scholarly journals An Efficient Protocol for High-frequency Direct Multiple Shoot Regeneration from Internodes of Peppermint (Mentha x piperita)

2010 ◽  
Vol 5 (12) ◽  
pp. 1934578X1000501
Author(s):  
Sanjog T. Thul ◽  
Arun K. Kukreja
Keyword(s):  
Shoot Regeneration ◽  
Multiple Shoots ◽  
Shoot Elongation ◽  
Shoot Formation ◽  
Multiple Shoot ◽  
Ms Medium ◽  
Mentha X Piperita ◽  
Half Strength ◽  
Multiple Shoot Regeneration

A simple, repeatable and efficient protocol for direct multiple shoot regeneration from internodal explants has been defined in peppermint ( Mentha x piperita var. Indus). In vitro regenerated shoots of peppermint were excised into 4 to 8 mm long internodes and cultured on Murashige and Skoog's medium supplemented with different cytokinins. In the hormonal assay, 3.0 mg L-l zeatin or 6-isopentenyl adenine independently supplemented to half strength MS medium exhibited multiple shoot regeneration, while thiaduzorn (0.1-3.0 mg L−1) showed no morphogenetic effect. A maximum of 85% in vitro cultured explants showed multiple shoot formation with an average of 7 shoots per explant on MS medium supplemented with zeatin. Multiple shoots were initiated within three weeks of cultivation. Internodes with regenerated multiple shoots were transferred to half - strength MS medium without supplementing with any plant growth hormone for shoot elongation and rhizogenesis. Rooted plants acclimatized and grew to maturity under glasshouse conditions. The plantlets developed were phenotypically identical to the parent plant and exhibited 96 % survival.

scholarly journals In vitro Shoot Cultures of Tupistra albiflora K. Larsen

2018 ◽  
Vol 17 (5) ◽  
pp. 405-411
Author(s):  
Jiraporn PALEE
Keyword(s):  
Agar Medium ◽  
Multiple Shoots ◽  
Shoot Formation ◽  
Multiple Shoot ◽  
Naphthalene Acetic Acid ◽  
Root Induction ◽  
Shoot Cultures ◽  
Ms Medium ◽  
In Vitro Shoots

To evaluate an efficient protocol for the micropropagation of Tupistra albiflora K. Larsen, the effects of N6-benzylaminopurine (BA) and naphthalene acetic acid (NAA) concentrations on multiple shoot and root induction were examined. In vitro shoots were used as the explant materials which were cultured on Murashige and Skoog (MS) agar medium supplemented with 0, 1, 2, 3 and 4 mg/L BA for 4 weeks to induce multiple shoots. It was found that the MS medium containing 3 mg/L BA induced 100 % shoot formation with the highest number of 3.2 shoots per explant (2.4-fold significantly higher than the control). For root induction, in vitro shoots were cultured on MS agar medium supplemented with 0, 1, 2, 3 and 4 mg/L NAA for 8 weeks. The results showed that the MS medium containing 1 mg/L NAA induced 100 % root formation with the highest number of 6.6 roots per explant (1.8-fold significantly higher than the control).

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