Influência do déficit hídrico na germinação de sementes e no desenvolvimento inicial de três espécies de Pleurothallidinae (Orchidaceae)

Barbero, Angelica Patricia Pavezzi; Barros, Fábio de; Silva, Emerson Alves da; Suzuki, Rogério Mamoru

doi:10.1590/s0100-84042011000400012

Cited by 4 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water plays a fundamental role in germination, triggering chemical reactions and metabolic processes for digestion of reserves and mobilization of these reserves for the embryo (Corte et al, 2006;Taiz et al, 2017). Low availability of water in imbibition affects the germination process and, therefore, simulation of water deficit in the germination test is appropriate for representing water available to the seed (Barbero et al, 2011). That way, it is also possible to observe the responses of germination and of mobilization of reserves under water deficit conditions, simulated for example, by a polyethylene glycol 6000 (PEG 6000) solution (Villela et al, 1991;Pereira et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Chemical treatment and mobilization of reserves of soybean seeds under water deficit

Catão,

Pontes,

Pinheiro

et al. 2024

J. Seed Sci.

View full text Add to dashboard Cite

Seed treatments with chemical phytosanitary products can compromise mobilization of seed reserves for the seedlings under water deficit conditions. The aim of this study was to evaluate the physiological quality, the initial seedling development, and the mobilization of reserves in soybean seeds treated with phytosanitary products under water deficit. The trial was set up in a completely randomized design in a 4 × 4 factorial arrangement: chemical treatments (control, Thiamethoxam, Fludioxonil + Metalaxyl-M, and Fipronil + Pyraclostrobin + Tiophanate-methyl) × osmotic potentials (0, -0.1, -0.2, and -0.3 MPa). We analyzed the following variables: germination; hypocotyl length, root length, and total seedling length; seedling length vigor index; cotyledon dry matter weight; seedling dry matter yield; seed reserve reduction; relative dry matter yield; seed reserve reduction rate; and conversion efficiency of seed reserves into seedling dry matter. Seed quality and seedling development decline under water deficit conditions. The treatment with Fipronil + Pyraclostrobin + Thiophanate-methyl results in lower phytotoxicity. The estimated cotyledon dry matter (CDM) weight is an indicator of phytotoxicity and water deficit. Mobilization of reserves is compromised in seeds treated with insecticides, reducing the capacity of conversion of reserves into dry matter. There is an inversely proportional relationship between the reduction in conversion and the efficiency of conversion of reserves of treated soybean seeds under water deficit.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical treatment and mobilization of reserves of soybean seeds under water deficit

Catão,

Pontes,

Pinheiro

et al. 2024

J. Seed Sci.

View full text Add to dashboard Cite

show abstract

“…Rodr. 19 , Prosthechea vitellina W. E. Higgins 20 and Dendrobium officinale Kimura and Migo 21 . In Vanilla genus there is limited information on the response to osmotic stress under in vitro conditions and the mechanisms of response to water stress in V. planifolia have not been fully studied.…”

Section: Introductionmentioning

confidence: 99%

In vitro response of vanilla (Vanilla planifolia Jacks. ex Andrews) to PEG-induced osmotic stress

Martínez-Santos

Cruz‐Cruz

Spinoso-Castillo

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Drought-induced water stress affects the productivity of the Vanilla planifolia Jacks. ex Andrews crop. In vitro culture technique is an effective tool for the study of water stress tolerance mechanisms. This study aimed to evaluate the morphological, physiological and biochemical response of V. planifolia under in vitro water stress conditions induced with polyethylene glycol (PEG). In vitro regenerated shoots of 2 cm in length were subjected to different concentrations of PEG 6000 (0, 1, 2 and 3% w/v) using Murashige and Skoog semi-solid culture medium. At 60 days of culture, different growth variables, dry matter (DM) content, chlorophyll (Chl), soluble proteins (SP), proline (Pro), glycine betaine (GB), stomatal index (SI) and open stomata (%) were evaluated. Results showed a reduction in growth, Chl content, SP, SI and open stomata (%) with increasing PEG concentration, whereas DM, Pro and GB contents rose with increasing PEG concentration. In conclusion, PEG-induced osmotic stress allowed describing physiological and biochemical mechanisms of response to water stress. Furthermore, the determination of compatible Pro and GB osmolytes can be used as biochemical markers in future breeding programs for the early selection of water stress tolerant genotypes.

show abstract

“…Water deficit or excess directly influences germination, slowing it down and/or increasing it, and hinders oxygen uptake, reducing seedling survival (Carvalho & Nakagawa, 2012;Marcos, 2015). Therefore, the ability to tolerate water deficit at different stages of plant development, including germination, can be a crucial factor in its establishment and survival in certain environments, depending in large part on the morphological, anatomical, and physiological characteristics of seed and plant (Barbero et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

et al. 2019

View full text Add to dashboard Cite

Water is considered the most important environmental resource for the germination process. This study aimed to evaluate the germination performance of Parkia platycephala seeds under different conditions of water and saline stress. Seed germination was tested with solutions of poly (ethylene glycol) 6000 and sodium chloride (NaCl) at seven osmotic potentials [0.0,-0.2,-0.4,-0.6,-0.8,-1.0, and-1.2MPa (megapascal)] and four replicates with 25 seeds in a completely randomized design, simulating the water and saline stress levels, respectively. The following seedling variables were evaluated: germination percentage, germination speed index, length, and dry mass. Results showed significant interaction between the agent and the osmotic potential for all evaluated variables. P. platycephala seeds presented higher tolerance to saline stress simulated by NaCl than to water stress, showing germination performance appropriate for glycophyte plants.

show abstract

Influência do déficit hídrico na germinação de sementes e no desenvolvimento inicial de três espécies de Pleurothallidinae (Orchidaceae)

Cited by 4 publications

References 24 publications

Chemical treatment and mobilization of reserves of soybean seeds under water deficit

Chemical treatment and mobilization of reserves of soybean seeds under water deficit

In vitro response of vanilla (Vanilla planifolia Jacks. ex Andrews) to PEG-induced osmotic stress

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

Contact Info

Product

Resources

About