Leaf gas exchange and growth of two papaya (Carica papaya L.) genotypes are affected by elevated electrical conductivity of the nutrient solution

Peçanha, Anderson Lopes; Silva, Jefferson Rangel da; Rodrigues, Weverton Pereira; Ferraz, Tiago Massi; Netto, Alena Torres; Lima, Roberta Samara Nunes de; Lopes, Tatiana Silva; Ribeiro, M.S.S.; Deus, Bruna Corrêa da Silva de; Couto, Tarcísio Rangel do; Schaffer, Bruce; Campostrini, Eliemar

doi:10.1016/j.scienta.2017.02.018

Cited by 5 publications

(2 citation statements)

References 52 publications

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“…A high EC may lead to the retention of toxic ions in the root zone, so ion imbalance may affect plant growth. Therefore, plant growth was decreased by a high EC [15,16]. Moreover, the increase in Cl − and Na + may limit the Ca 2+ and K + uptake of roots because the hydrated radii of potassium and calcium are higher than that of sodium.…”

Section: Plant Growth Parametersmentioning

confidence: 99%

“…The leaf photosynthesis rate, stomatal conductance, leaf transpiration, and intercellular CO 2 concentration of some plants have also been seen to be significantly decreased by a higher EC of the NS in a hydroponic culture system, such as pak choi [8], lettuce [30], and papaya [16]. Coinciding with these former studies, our results also showed that leaf gas exchange parameters (P n , C i , g s , and T r ) were significantly decreased at a high EC of 8.0 dS•m −1 because the salinity stress was increased with an increasing EC of the NS.…”

Section: Leaf Gas Exchange Parametersmentioning

confidence: 99%

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Optimizing the Electrical Conductivity of a Nutrient Solution for Plant Growth and Bioactive Compounds of Agastache rugosa in a Plant Factory

2020

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The objective of this study was to determine the proper electrical conductivity (EC) of a nutrient solution (NS) for accumulating bioactive compounds of Agastache rugosa without decreasing plant growth. Six-week-old seedlings were transplanted in a deep flow technique system with Hoagland NS with a 2.0 dS·m−1 EC for the initial week. From eight days after transplanting, the plants were treated with six EC treatments of 0.5, 1.0, 2.0, 4.0, 6.0, and 8.0 dS·m−1 for three weeks. Plant growth parameters, leaf gas exchange parameters, the relative chlorophyll value, and the ratio of variable to maximum fluorescence (Fv/Fm) were measured, and the rosmarinic acid (RA), tilianin, and acacetin concentrations were analyzed at 28 days after transplanting. The results showed that almost all plant growth parameters were maximized at 2.0 and 4.0 dS·m−1 and minimized at 8.0 dS·m−1 compared with the other EC treatments. The relative chlorophyll and Fv/Fm values were maximized at 2.0 and 4.0 dS·m−1. Similarly, leaf gas exchange parameters were increased at 2.0 and 4.0 dS·m−1. The RA content exhibited significantly higher values at 0.5, 1.0, 2.0, and 4.0 dS·m−1 compared with other treatments. The tilianin and acacetin contents exhibited the significantly highest values at 4.0 and 0.5 dS·m−1, respectively. These results suggest optimal EC treatment at 4.0 dS·m−1 for increasing bioactive compounds in A. rugosa plants without decreasing plant growth. Excessively high or low EC induced salinity stress or nutrient deficiency, respectively. Furthermore, among the plant organs, the roots of A. rugosa contained the highest RA concentration and the flowers contained the highest tilianin and acacetin concentrations, which revealed a higher utilization potential of the roots and flowers for bioactive compounds.

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Section: Plant Growth Parametersmentioning

confidence: 99%

Section: Leaf Gas Exchange Parametersmentioning

confidence: 99%

Optimizing the Electrical Conductivity of a Nutrient Solution for Plant Growth and Bioactive Compounds of Agastache rugosa in a Plant Factory

2020

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Diagnosis and management of nutrient constraints in papaya

Fallas-Corrales

Zee

2020

Fruit Crops

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Contrasting salinity effects of artificial seawater and sodium chloride on Carica papaya L. cultivar Red Lady physiology and growth

de Souza,

Schaffer,

Vargas

et al. 2024

CABI Agric Biosci

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Background Many coastal areas of the world will be impacted by seawater intrusion inland exposing crops to increasing levels of soil salinity. Studies of salinity stress in horticultural crops, including papaya, invariably use NaCl as the salt source, which may not be indicative of seawater. Methods This study compared plant growth, physiological, and nutritional responses, including leaf gas exchange, maximal potential quantum efficiency of photosystem II (the ratio of variable to maximum chlorophyll fluorescence; Fv/Fm), the leaf chlorophyll index (LCI), electrolyte leakage (EL), leaf relative water content (RWC), leaf water potential (Ψw), leaf osmotic potential (Ψo), leaf and root N, P, K, Ca, Mg, Na and Cl contents, and growth of potted ‘Red Lady’ papaya plants, in a calcined clay substrate, irrigated with NaCl or artificial seawater (Instant Ocean®) at six soil electrical conductivity (EC) levels (0, 1, 2, 3, 4 or 6 dS m−1). Results There were slight significant reductions in Ψw, Ψo, net CO2 assimilation (A), stomatal conductance (gs), and transpiration (Tr) with increasing EC regardless of the salt source. Leaf Ca, Mg, Na and Cl contents and root Mg, Na, and Cl increased significantly with increasing EC levels. For both salt sources, there was an indication of osmotic adjustment and tolerance of papaya up to an EC level of 6 dS m−1. A significant difference between the response to NaCl and artificial seawater was observed for plant height, leaf Mg and Cl contents, and root Mg and Na contents. Conclusion The use artificial seawater may be a better source than NaCl for studying papaya responses to increasing soil salinity.

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Leaf gas exchange and growth of two papaya (Carica papaya L.) genotypes are affected by elevated electrical conductivity of the nutrient solution

Cited by 5 publications

References 52 publications

Optimizing the Electrical Conductivity of a Nutrient Solution for Plant Growth and Bioactive Compounds of Agastache rugosa in a Plant Factory

Optimizing the Electrical Conductivity of a Nutrient Solution for Plant Growth and Bioactive Compounds of Agastache rugosa in a Plant Factory

Diagnosis and management of nutrient constraints in papaya

Contrasting salinity effects of artificial seawater and sodium chloride on Carica papaya L. cultivar Red Lady physiology and growth

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