Aplicação de água salina no desenvolvimento e comportamento fisiológico do coqueiro

Júnior, Carlos Dias da Silva; Passos, E. E. M.; Gheyi, Hans Raj

doi:10.1590/s1415-43662002000100008

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…The effects of soil salinity levels in the present study corroborate the findings of Lima (2014), who also described a significant effect of irrigation water salinity on stomatal conductance. The findings of the present study are also consistent with those of Silva Júnior, Passos, and Gheyi (2002), who hypothesized that the coconut palm, when irrigated with saline water, has mechanisms that operate to prevent water stress by closing stomata, thereby substantially compromising gaseous exchange. Additionally, Marinho et al (2005) found that stomatal conductance in coconut palm plants decreased as the irrigation water salinity increased.…”

Section: Resultssupporting

confidence: 92%

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

et al. 2017

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-The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‗Jiqui Green' associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m -1 ). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met.Keywords: Cocos nucifera L.. Water and salt stress. Physiology. RESPOSTAS FISIOLÓGICAS DE PLANTAS DE COQUEIRO ANÃO SOB DEFICIÊNCIA HÍDRICA, EM SOLOS AFETADOS POR SAISResumo -Objetivou-se, com este trabalho, caracterizar as repostas fisiológicas aclimatativas de plantas jovens de coqueiro Anão, cultivar -Verde do Jiqui‖, associadas com a sua tolerância às condições de múltiplos estresses abióticos (deficiência hídrica e salinidade do solo), atuando isolados e/ou combinados. O estudo foi realizado sob condições controladas e avaliaram-se: as trocas gasosas foliares, o rendimento quântico da fluorescência da clorofila a e os teores relativos de clorofila total (índice Spad). O experimento foi conduzido sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, sendo as parcelas constituídas por diferentes níveis de deficiência hídrica, mediante a imposição de cinco distintos percentuais de reposição das perdas de água por evapotranspiração potencial da cultura (100; 80; 60; 40 e 20%) e as subparcelas constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m -1 ). Os mecanismos fisiológicos são efetivamente limitados quando a deficiência hídrica e a salinidade atuam isoladamente e/ou em conjunto. Os efeitos do estresse hídrico se mostram mais efetivos nos comprometimentos dos parâmetros fisiológicos, em detrimento à salinidade do solo. As magnitudes da...

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Section: Resultssupporting

confidence: 92%

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

et al. 2017

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“…These results are consistent with those obtained by Silva Júnior et al (2002), who evaluated the effects of water stress and irrigation with water of different salinity levels on "Gigante-do-Brasil" coconut responses and found that one of the first consequences of water stress and the accumulation of salts in the soil for the species was reduction in leaf area, to which is attributed loss of leaves and reduction in the emergence of new leaves, as a strategy to adapt to stressors.…”

Section: Resultssupporting

confidence: 90%

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

et al. 2016

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-The aim was to analyze the establishment of young "Green Dwarf" coconut plants in soils affected by salts and under water stress, by evaluating leaf area, biomass production and allocation. In the experiment, conducted in protected environment in Fortaleza, CE, in statistical design of randomized blocks in a split plot arrangement, the effects of different water deficit levels (plots) were evaluated, by imposing different percentages of replacement of water losses by potential crop evapotranspiration -ETpc (20, 40, 60, 80 and 100%), associated with subplots consisting of increasing soil salinity levels (1. 72, 6.25, 25.80 and 40.70 dS m -1 ) provided by soil collected at different parts of the Morada Nova Irrigated Perimeter -PIMN. Leaf area and biomass production were sharply reduced by the conditions of water stress and high soil salinity, apparently being more critical to the crop under water restriction condition. The degree of water stress can increase the susceptibility to salinity and plants can be considered, in general terms, as moderately tolerant to the effects of salinity, when combined with water deficiency. Coconut seedlings show full capacity of establishment in PIMN saline soils, corresponding to the level of electrical conductivity of 6.50 dS m -1 , but only when the water supply remains adequate. For higher salinity levels, plants survive, but their size is reduced by around 50%, even when fully irrigated. Index terms: Cocos nucifera L., initial growth, multiple stresses, salinity, drought. ESTABELECIMENTO DE PLANTAS JOVENS DE COQUEIRO-"ANÃO-VERDE" EM SOLOS AFETADOS POR SAIS E SOB DEFICIÊNCIA HÍDRICARESUMO -Objetivou-se analisar a capacidade de estabelecimento de plantas jovens de coqueiro, cultivar "Anão-Verde", em solos afetados por sais e sob deficiência hídrica, mediante a avaliação da área foliar, da produção e da alocação de biomassa. No experimento, conduzido em ambiente protegido, em Fortaleza-CE, avaliaram-se, sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, os efeitos de diferentes níveis de deficiência hídrica (parcelas), mediante a imposição de distintos percentuais de reposições das perdas de água por evapotranspiração potencial da cultura -ETpc (20; 40; 60; 80 e 100%), associados às subparcelas, constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m -1 ), proporcionados pelos solos coletados nos diferentes pontos do Perímetro Irrigado Morada Nova -PIMN. A área foliar e a produção de biomassa das plantas são acentuadamente reduzidas pelas condições de restrição hídrica e de elevada salinidade do solo, sendo aparentemente mais crítica à cultura a condição de restrição hídrica. O grau de estresse hídrico é capaz de acentuar a suscetibilidade à salinidade, e as plantas qualificam-se, em termos gerais, como moderadamente tolerantes aos efeitos decorrentes da salinidade, quando combinados com a deficiência hídrica. As plantas jovens de coqueiro mostram plena capacidade de estabelecimento nos solos...

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“…Independente do genótipo, o ganho de produção com a irrigação pôde ser evidenciado direta ou indiretamente através do potencial hídrico foliar (Ψ) e da fotossíntese líquida em coqueiros gigantes ao longo dos meses e do ano (Silva Junior, 1994;Prado et al, 2001;Silva Junior, et al 2002). A fotossíntese e a transpiração estão intimamente relacionadas por meio dos estômatos, pois ao mesmo tempo em que os estômatos oferecem resistência à difusão do vapor d´água de dentro da folha para a atmosfera, constituem-se em uma barreira para a aquisição de CO2.…”

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Comportamento Fisiologico Do Coqueiro Gigante Em Ambientes Distintos Na Região Costeira Do Estado Do Ceara

Santos¹,

Lacerda²,

Neves³

et al. 2017

Anais Do IV Inovagri International Meeting - 2017

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Aplicação de água salina no desenvolvimento e comportamento fisiológico do coqueiro

Cited by 7 publications

References 14 publications

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

Comportamento Fisiologico Do Coqueiro Gigante Em Ambientes Distintos Na Região Costeira Do Estado Do Ceara

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