scholarly journals Role of Smoke Stimulatory and Inhibitory Biomolecules in Phytochrome-Regulated Seed Germination of Lactuca sativa

2019 ◽  
Vol 181 (2) ◽  
pp. 458-470 ◽  
Author(s):  
Shubhpriya Gupta ◽  
Lenka Plačková ◽  
Manoj G. Kulkarni ◽  
Karel Doležal ◽  
Johannes Van Staden
Keyword(s):  
Seed Germination ◽  
Lactuca Sativa

scholarly journals Potencial Alelopático de Espécies da Família Fabaceae Lindl

2020 ◽  
Vol 24 (1) ◽  
pp. 65-74
Author(s):  
Ykaro Richard Oliveira ◽  
Paulo Henrique da Silva ◽  
Maria Carolina de Abreu ◽  
Cledinaldo Borges Leal ◽  
Lauana Pereira de Oliveira
Keyword(s):  
Chemical Composition ◽  
Seed Germination ◽  
Weed Control ◽  
Lactuca Sativa ◽  
Allelopathic Effect ◽  
Ecological Role ◽  
Natural Conditions ◽  
Allelopathic Effects ◽  
Laboratory Bioassays

O objetivo deste artigo foi realizar uma pesquisa de caráter bibliográfico acerca dos estudos desenvolvidos com representantes da família Fabaceae e destacar quais efeitos alelopáticos tais espécies desempenharam sobre outras plantas. Foram listadas 24 espécies de Fabaceae, sendo o gênero Anadenanthera o mais representativo neste artigo, com três espécies estudadas. A partir da análise dos arquivos, foi evidenciado que os representantes da família Fabaceae investigados apresentam em sua composição química substâncias responsáveis por gerar um efeito alelopático sobre outras espécies, caracterizando, dessa forma, uma função ecológica desses vegetais para a constituição dos ecossistemas em que se incluem. Além disso, tal característica pode despontar uma provável utilização desses seres no controle de plantas daninhas, que representam um grande problema para os agricultores. Também foram percebidos com maior frequência estudos voltados ao uso de bioensaios laboratoriais com o uso da espécie Lactuca sativa, noticiando a carência de estudos mais complexos sobre a ação dos aleloquímicos, quando lançados em condições naturais no ambiente.   Palavras-chave: Aleloquímicos. Germinação de Sementes. Leguminosae.   Abstract The objective of this paper was to perform a bibliographic research about the studies carried out with representatives of the Fabaceae family and stress out what  allelopathic effects such species develop on other plants. Twenty-four Fabaceae species were listed, being the Anadenanthera genus the most representative in this article, with three species studied. It was noticed in the studies analysis that certain Fabaceae species contain  in their chemical composition, substances responsible for an allelopathic effect on other species, characterizing an ecological role of these plants for the  ecosystems establishment. This feature can suggest the use of these species in weed control, which represent a problem to farmers. It was seen more often studies focused on the use of laboratory bioassays with Lactuca sativa, reporting the lack of more complex studies on the action of allelochemicals when launched in natural conditions in the environment. Keywords: Allelochemicals. Seed Germination. Leguminosae.

scholarly journals Preventing thermoinhibition in a thermosensitive lettuce genotype by seed imbibition at low temperature

2003 ◽  
Vol 60 (3) ◽  
pp. 477-480 ◽  
Author(s):  
Warley Marcos Nascimento
Keyword(s):  
Seed Germination ◽  
Low Temperature ◽  
High Temperatures ◽  
Lactuca Sativa ◽  
Lettuce Seed ◽  
Temperature Dependent ◽  
Lettuce Seeds ◽  
Lactuca Sativa L ◽  
Lettuce Seed Germination ◽  
Dark Green

Lettuce (Lactuca sativa L.) seed germination is strongly temperature dependent and under high temperatures, germination of most of genotypes can be erratic or completely inhibited. Lettuce seeds of 'Dark Green Boston' (DGB) were incubated at temperatures ranging from 15° to 35°C at light and dark conditions. Other seeds were imbibed in dark at 20°; 25°; 30°; and 35°C for 8 and 16 hours and then transferred to 20 or 35°C, in dark. Seeds were also incubated at constant temperature of 20° and 35 °C, in the dark, as control. In another treatment, seeds were primed for 3 days at 15°C with constant light. DGB lettuce seeds required light to germinate adequately at temperatures above 25°C. Seeds incubated at 20°C had 97% germination, whereas seeds incubated at 35°C did not germinate. Seeds imbibed at 20°C for 8 and 16 hours had germination. At 35°C, seeds imbibed initially at 20°C for 8 and 16 hours, had 89 and 97% germination, respectively. Seeds imbibed at 25°C for 16 hours, germinated satisfactory at 35°C. High temperatures of imbibition led to no germination. Primed and non-primed seeds had 100% germination at 20°C. Primed seeds had 100% germination at 35°C, whereas non-primed seeds germinate only 4%. The first hours of imbibition are very critical for lettuce seed germination at high temperatures.

scholarly journals Early development of corn seedlings primed with synthetic tenorite nanofertilizer

2020 ◽  
Vol 42 ◽  
Author(s):  
Michel Esper Neto ◽  
David W. Britt ◽  
Kyle Alan Jackson ◽  
Alessandro Lucca Braccini ◽  
Tadeu Takeyoshi Inoue ◽  
...  
Keyword(s):  
Seed Germination ◽  
Size Effects ◽  
Seed Priming ◽  
Seedling Development ◽  
Cuo Nanoparticles ◽  
The Other ◽  
Corn Seed ◽  
Cu Toxicity ◽  
Germination And Growth

Abstract: Fertilizer formulation alternatives that avoid unnecessary losses and environmental impacts are being investigated in agricultural management. Seed priming with nanofertilizers prior to planting, reduces concerns about non-target dispersion; however, priming formulations and concentrations must be carefully selected to avoid undesired effects. Here, seed germination and seedling development were evaluated after seed priming with CuO nanoparticles (NPs), CuO bulk and CuCl2. The seeds were immersed in priming solutions of 0, 20, 40, 80 and 160 mg.L−1 Cu for the three Cu sources. Following 8 hours priming, the seeds were evaluated for germination and vigor (first germination count). Root and shoot lengths were measured as well as shoot and root dry biomass. The copper NP did not show any toxic effects on corn seed germination and growth, and also promoted higher biomass when compared to the other Cu sources. On the other hand, CuCl2 primed seeds exhibited Cu-toxicity in roots and shoots for all concentrations tested. Bulk Cu priming results indicated the better role of NPs size effects. These findings support NP-seed priming as an alternative to delivery of essential micronutrients, such as copper, to corn seedlings.

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