Growth and physiology of ‘Sunrise’ papaya seedlings in response to salinity and humic acid

Targino, Vitor Araujo; Lopes, Adriano Salviano; Sousa, Valéria Fernandes de Oliveira; Henschel, Juliane Maciel; Silva, João Henrique Barbosa da; Rodrigues, Lucas Soares; Medeiros, Wiliana Júlia Ferreira de; Batista, Diego Silva; Dias, Thiago Jardelino

doi:10.1590/1807-1929/agriambi.v27n5p352-358

Cited by 4 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Humic substances (HS) have been used to supply nutrients and/ or stimulate the production of phytohormones that lead to root growth that the plant would otherwise not achieve (El-Hai et al, 2019;Qin & Leskovar, 2020a;Soteriou et al, 2021). Previous studies have demonstrated the effect of humic substances as seedling growth modulators, among other beneficial effects (Gomes Júnior et al, 2019;Qin & Leskovar, 2020a;Silva et al, 2022;Targino et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Influence of the application of humic substances on the growth of watermelon and melon seedlings

Andrade,

Oliveira Neto,

Pinto Júnior

et al. 2023

Agron. Colomb.

View full text Add to dashboard Cite

Growing watermelon (Citrullus lanatus) and melon (Cucumis melo) is an important activity in the Brazilian Cerrado; however, many factors limit cultivation, including the difficulty of producing high-quality seedlings. In this study, the effect of humic substances (HS) on growth of ‘Crimson Sweet’ watermelon and ‘Yellow’ melon seedlings was evaluated. An experiment was carried out in a completely randomized design with five HS treatments applied to the soil: 0 (control), 5, 10, 15, and 20 g L-1. The growth of watermelon and melon seedlings was influenced by the application of humic substances. Use of HS increased plant height, stem diameter, root length, root volume, shoot dry biomass, root dry biomass, and Dickson’s quality index. HS boost plant growth, whose improved root system may have provided greater absorption and accumulation of mineral nutrients. Based on the quality of the seedlings (Dickson index), the application of 14 g L-1 of HS is recommended for watermelon seedling production and 15 g L-1 of HS for melon seedling production.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of the application of humic substances on the growth of watermelon and melon seedlings

Andrade,

Oliveira Neto,

Pinto Júnior

et al. 2023

Agron. Colomb.

View full text Add to dashboard Cite

show abstract

Humic substances and plant abiotic stress adaptation

Canellas,

da Silva,

Busato

et al. 2024

Chem. Biol. Technol. Agric.

View full text Add to dashboard Cite

Background Traditional agriculture is on the front line of climate change, being most impacted by the increase in the intensity and frequency of extreme events, such as floods, drought and rising temperatures. Local ecological knowledge is a recognized keystone of successfully managed socioecological systems, but loss of soil fertility, water scarcity, incidence of diseases and decreased production due to climate change are linked to the greater vulnerability experienced by traditional farmers. Plant biostimulants are natural products used to stimulate nutrient uptake and efficiency by crops, increase tolerance to abiotic/biotic stress and improve quality without negative impacts on the environment if obtained from renewed sources. Humic substances are some of the most used plant biostimulants in agriculture and play a central role in plant adaptation. Materials and methods We reviewed and discussed a sample set of papers (n = 52) about humic substances to mitigate abiotic stress in crops using data basis from Web of Science (Clarivate Analytics), Scopus—IBM (International Business Machines Corporation), and Scielo (Scientific Electronic Library Online). Results The predominance of authors in the global south is notable, but it is not a coincidence, since this is where the effects of climate change will have the greatest impact. The mechanisms involved in the stress mitigation involve the activation of signaling factors, gene response induction, the accumulation of osmoprotective and anti-oxidant compounds, the induction of antioxidative metabolism, ion homeostasis, membrane transport and adjustment of hormonal balance. The intriguing question is: how can a complex mixture of molecules affect so many distinct effects on plants responsible for plant adaptation? Conclusions The complexity of humic substances challenges our knowledge method, but supramolecular chemistry may provide answers that enable us to broaden our understanding of the plant defense mechanisms modulated by these substances. Graphical Abstract

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Growth and physiology of ‘Sunrise’ papaya seedlings in response to salinity and humic acid

Cited by 4 publications

References 26 publications

Influence of the application of humic substances on the growth of watermelon and melon seedlings

Influence of the application of humic substances on the growth of watermelon and melon seedlings

Humic substances and plant abiotic stress adaptation

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

Contact Info

Product

Resources

About