Germinação de duas espécies da caatinga sob déficit hídrico e salinidade

Santos, Cibele Alves dos; Silva, Natália Vaz da; Walter, Letícia Siqueira; Silva, Elaine Cristina Alves da; Nogueira, Rejane Jurema Mansur Custódio

doi:10.4336/2016.pfb.36.87.1017

Cited by 38 publications

(36 citation statements)

References 19 publications

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“…L. P. Queiroz (catingueira) e Anadenanthera colubrina (Vell.) Brenan (angico), Santos et al (2016) observaram queda nos valores médios de germinação e IVG das duas espécies quando submetidas aos potenciais osmóticos mais negativos. Comportamento semelhante também foi notado por Lopes et al (2015) estudando os efeitos da salinidade na germinação de Gallesia integrifolia (Spreng.)…”

Section: Discussionunclassified

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

et al. 2017

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O objetivo do presente trabalho foi avaliar o efeito do estresse salino na germinação e crescimento inicial de canafístula (Peltophorum dubium (Sprengel) Taubert), tamboril (Enterolobium contortisiliquum (Vell.) Morong.) e pau-formiga (Triplaris americana L.), além de determinar a máxima tolerância das três espécies arbóreas florestais à presença de NaCl na solução de embebição. Foi adotado delineamento experimental inteiramente casualizado, com quatro repetições de 50 sementes, no esquema fatorial 3 x 5, sendo estudada a resposta das três espécies a cinco níveis de potencial osmótico (0; -0,3; -0,6; -1,2 e -1,8 MPa), por simulação de estresse salino com NaCl. Aos 28 dias após semeadura foram avaliados: percentagem de germinação; índice de velocidade de germinação (IVG); tempo médio de germinação; comprimento da maior raiz; massa seca da parte aérea, raízes e total. A germinação e o crescimento inicial de plântulas de tamboril e canafístula foram afetados negativamente pelo aumento da concentração salina do meio. Pau-formiga mostrou-se mais tolerante ao estresse salino, apresentando elevação dos valores médios de percentagem de germinação, IVG, comprimento da maior raiz e produção de massa seca total em potenciais osmóticos variando de -0,81 a -1,15 Mpa. Os maiores valores médios de produção de massa seca da parte aérea, raízes e total foram observados em plântulas de tamboril.

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Section: Discussionunclassified

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

et al. 2017

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“…Seed germination is a critical stage in plant life cycle, depending on the genetics of each species and environmental conditions that seeds are exposed. In arid and semi-arid regions with recurrent adversities such as salinity and water deficiency, the water absorption by the seed during the germination process is hampered by the negativity of the soil matrix potential (Santos, N. V. Silva, Walter, E. C. A. Silva, & Nogueira, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the water absorption restriction due to the reduction of soil potential, toxic effects in seeds undergoing the germination process have been observed. These toxic effects may lead to cell metabolism alterations, reduction in germination percentage and speed, and changes in the development and growth of seedlings (Pelegrini, Borcioni, Nogueira, Koehler, & Quoirin, 2013;Santos et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Seed Germination and Initial Growth of Quinoa Seedlings Under Water and Salt Stress

Barbieri¹,

Menegaes²,

Munareto³

et al. 2019

JAS

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Excessive amounts of salts and soil water deficiency interfere on seed germination and the full development of several crops. The objective of this research was to evaluate the effect of water stress and salinity on the germination process and initial growth of quinoa (Chenopodium quinoa Willd.) seedlings. In the first experiment, two quinoa seed lots with different physiological conditions were distributed on paper soaked in aqueous solution containing polyethylene glycol PEG-6000 in osmotic potentials corresponding to 0.0; -0.1; -0.2; -0.3 and -0.4 MPa and held at 20 °C under 8 hours of light exposition. In the second experiment, solutions of sodium chloride (NaCl), potassium chloride (KCl), calcium chloride (CaCl 2 ) and magnesium chloride (MgCl 2 ) were used to simulate the effect of salinity using the osmotic potentials, temperature and light conditions previously described. Assessed parameters were the germination percentage, first count, length and dry mass of seedlings. There was a reduction in quinoa germination percentage, first seed count and seedling length as the osmotic potential decreased in CaCl 2 , NaCl, KCl, MgCl 2 and PEG-6000 solutions. The quinoa seeds exhibited higher tolerance to NaCl and KCl salts in the germination process and initial seedling growth. The progressive reduction of the osmotic potential induced by salts NaCl, KCl, CaCl 2 , MgCl 2 and PEG-6000 negatively affects seed germination and initial growth of quinoa seedlings.

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“…In addition to water availability, high saline concentration is also considered a limiting factor to the germination process (Taiz & Zeiger, 2013), acting to reduce the amount of water available and, consequently, affecting the germination percentage and speed of the seeds and the formation of normal seedlings (Carvalho & Nakagawa, 2012). In addition, salinity can also lead to toxic effects on the seed, which can result in the embryo death (Santos et al, 2016). However, tolerance or resistance to salinity varies according to species (Gordin et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

et al. 2019

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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.

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Germinação de duas espécies da caatinga sob déficit hídrico e salinidade

Cited by 38 publications

References 19 publications

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

Efeito da salinidade na germinação e crescimento inicial de plântulas de três espécies arbóreas florestais

Seed Germination and Initial Growth of Quinoa Seedlings Under Water and Salt Stress

Ecophysiology of Germination of Parkia platycephala Benth. Seeds

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