Evaluation of variability to drought and saline stress through the germination of different ecotypes of carob (Ceratonia siliqua L.) using a hydrotime model

Cavallaro, Valéria; Barbera, Antonio C.; Maucieri, Carmelo; Gimma, Greta; Scalisi, C.; Patanè, Cristina

doi:10.1016/j.ecoleng.2016.06.040

Cited by 50 publications

(51 citation statements)

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“…Generally, seed germination decreased with increasing salt concentrations and salt-specific effects [49,50]. In our study, the three different genotypes were not affected by the levels of salt applied, showing tolerance to high salinity.…”

Section: Laboratory Experimentsmentioning

confidence: 68%

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

et al. 2018

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Abstract:The aims of this study were to evaluate: (1) the effect of sodium chloride (NaCl) and mannitol at different osmotic pressures on the germination of three proso millet (Panicum miliaceum L.) genotypes (VIR 9181, Unikum, and Kinelskoje) under controlled laboratory conditions; and (2) the effects of irrigation water salinity, maximum crop evapotranspiration (ETm) restitution regimes, and arbuscular mycorrhizal fungi (AMF) inoculation on forage production in a marginal Mediterranean soil for the genotypes that showed the highest and lowest seed germination. In the laboratory experiment, the Unikum genotype showed the highest seed germination (95.1%), whereas the lowest was found for Kinelskoje (80.4%). Regardless of the osmoticum type, germination was significantly reduced by osmotic pressure increases. Unikum showed a higher fresh biomass yield (FBY) (620.4 ± 126.3 g m −2 ) than Kinelskoje (340.0 ± 73.5 g m −2 ). AMF inoculation did not influence FBY under salt conditions, while in the absence of salt conditions it significantly increased the Unikum FBY (+50.7%) as compared to the uninoculated treatment (552.5 ± 269 g m −2 ). The 25% ETm significantly reduced FBY in both genotypes (−86.2% and −84.1% for Unikum and Kinelskoje, respectively) sd compared to the 100% ETm treatments (1090.3 ± 49.7 g m −2 in Unikum and 587 ± 72.2 g m −2 in Kinelskoje). The obtained results give novel information about proso millet forage production in low-input agriculture in marginal semi-arid Mediterranean land.

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Section: Laboratory Experimentsmentioning

confidence: 68%

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

et al. 2018

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“…As moléculas do polímero PEG 6000 são grandes em comparação às do NaCl e por isso não passam facilmente pela parede celular, reduzindo drasticamente a absorção de água pela semente (DODD; DONAVAN, 1999;ELIAS et al, 2012;CAVALLARO et al, 2016). Com isso, a embebição da semente ocorre de forma lenta devido à pressão osmótica, retardando a ativação do metabolismo e, consequentemente, a germinação (CAVALLARO et al, 2016).…”

Section: Resultsunclassified

“…De acordo com Cavallaro et al (2016), a embebição de água pela semente é geralmente maior em soluções isotônicas de NaCl do que em PEG. Isso ocorre porque em NaCl os íons podem penetrar a parede celular tornando o potencial osmótico da semente menor que o do substrato, auxiliando na absorção de água e no início do processo germinativo (DODD; DONAVAN, 1999).…”

Section: Resultsunclassified

“…Os agentes osmóticos NaCl, glicerol, sucrose e o manitol provocam tanto o estresse hídrico como salino, pois possuem baixo peso molecular e, em razão disso, podem entrar e se acumular na célula provocando efeito tóxico. O polietilenoglicol (PEG) é um composto inerte muito utilizado para simular apenas o estresse hídrico, pois não provoca efeitos tóxicos devido ao seu alto peso molecular (KAYA et al, 2006;ELIAS et al, 2012;CAVALLARO et al, 2016).…”

Section: Introductionunclassified

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ESTRESSE SALINO E HÍDRICO NA GERMINAÇÃO E CRESCIMENTO INICIAL DE PLÂNTULAS DE <i>Toona ciliata</i> M. ROEM. var. <i>australis</i>

Lucchese¹,

Bovolini²,

Hilgert³

et al. 2018

Ciênc. Florest.

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RESUMOA espécie florestal Toona ciliata var. australis possui madeira de alto valor econômico para móveis e seus plantios não são afetados pela Hypsipyla grandella, praga que ataca plantios de monocultura de espécies nativas semelhantes à Toona ciliata. Possui uma estreita relação com a água disponível, ocorrendo geralmente em florestas úmidas no seu ambiente natural. Em plantios comerciais, esse é um dos fatores que mais limita seu estabelecimento e crescimento inicial. Nas últimas décadas, sua área de plantio no Brasil foi ampliada, entretanto, é escasso o conhecimento sobre o efeito de ambientes adversos na germinação e crescimento inicial de plântulas. O objetivo deste trabalho foi avaliar os efeitos do estresse salino e hídrico na germinação e crescimento inicial de plântulas de Toona ciliata, utilizando-se soluções contendo, ou NaCl, ou PEG 6000, nos potenciais osmóticos: -0,1; -0,2; -0,3; -0,4; -0,5; -0,6; -0,9; -1,2 e -1,5 MPa, mais a testemunha, com água esterilizada. As sementes foram submetidas ao teste de germinação sobre papel-germitest umedecido com a solução correspondente, e incubadas a 25 ± 2°C e fotoperíodo de 16 h por 21 dias. O delineamento experimental foi o inteiramente casualizado, arranjado em esquema fatorial 2 × 10 (agentes osmóticos × potenciais osmóticos), com quatro repetições de 50 sementes cada. Conforme a redução do potencial osmótico observou-se menor germinação, número de plântulas normais, massa fresca, comprimento de plântula e maior número de sementes duras, sendo mais severo em PEG 6000. Portanto, houve mais sementes germinadas sob o efeito do NaCl do que do PEG 6000. Entretanto, apesar da germinação alta em NaCl, o número de plântulas anormais também foi maior que em PEG 6000. Concluise que a germinação e o crescimento inicial de plântulas de Toona ciliata são afetados tanto pelo estresse salino como hídrico, sendo as plântulas mais sensíveis ao estresse hídrico, e com maior probabilidade de desenvolver plântulas anormais sob estresse salino. Palavras-chave: cedro-australiano; PEG 6000; NaCl. ABSTRACTThe Toona ciliata var. australis is a tree species which yields a very high-quality timber for furniture and is unaffected by Hypsipyla grandella, a pest that attacks monoculture plantations of native species similar to Toona ciliata. It has a close relationship with water availability, occurring mainly in humid forest in its natural habitat. In commercial plantations this is an important limitation to the establishment and

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“…Germination failure may therefore be due to dormancy processes that characterize many wild species (Baskin & Baskin ). The low final germination percentage observed in some species belonging to the Fabaceae may be linked to an impermeable seed coat, which occurs in many Fabaceae taxa (Pérez‐García et al ; Cavallaro et al ) and hampers water uptake, thus compromising germination. This physical dormancy is an important survival strategy for wild species when unfavorable environmental conditions (Qaderi & Cavers ) damage the readily germinable seeds of the population.…”

Section: Discussionmentioning

confidence: 99%

Assessing and modeling seed germination of Mediterranean wildflowers for low input landscape restoration

Toscano

Romano

Tribulato

et al. 2017

Restoration Ecology

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Native species are recommended for use in landscape restoration because they adapt well to the local pedo‐climatic conditions. Despite the high biodiversity in the Mediterranean, the use of native plants is hampered by the limited knowledge of their seed germination. This is particularly true for a number of plants which are appropriate for creating species‐rich herbaceous communities. In this study, seeds of 35 species were collected in different roadside and degraded sites in rural and urban areas. Two experiments were carried out to determine the influence of light and thermal conditions on seed germination. In the first experiment, seeds of 17 species were tested at different temperatures (5, 15, and 25°C). At 15°C, seed germination was tested under both dark and light conditions. In the second experiment, the germination of 30 species was tested under alternating temperatures (25/15°C) and dark/light conditions. The responses of the various species differed in relation to thermal levels and light conditions, e.g., Bartsia trixago did not germinate in the dark at constant temperatures (5, 15, and 25°C), while in the light (15°C) and at alternating temperatures (25/15°C) in light and dark conditions, germination was over 60%. In both experiments, Tragopogon porrifolius and Triticum ovatum showed the highest germination rate (≥88%). With the sole exception of Medicago orbicularis, all members of the Fabaceae showed no or low germination. The definition of the germination requirements of some Mediterranean species, highlighted in these experiments, provides useful information for the creation of low input green areas and environmental restoration using these species.

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Evaluation of variability to drought and saline stress through the germination of different ecotypes of carob (Ceratonia siliqua L.) using a hydrotime model

Cited by 50 publications

References 41 publications

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

ESTRESSE SALINO E HÍDRICO NA GERMINAÇÃO E CRESCIMENTO INICIAL DE PLÂNTULAS DE <i>Toona ciliata</i> M. ROEM. var. <i>australis</i>

Assessing and modeling seed germination of Mediterranean wildflowers for low input landscape restoration

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