Respostas morfofisiológicas entre procedências de canafístula submetidas a diferentes condições hídricas e nutricionais

Carvalho, Rafael Pelloso de; Davide, Livia Maria Chamma; Borges, Felipe Luis Gomes; Davide, Antônio Cláudio; Daniel, Omar

doi:10.4336/2015.pfb.35.83.889

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…This is owing to the fact that in some species, application of ABA can promote the production of ethylene (KERBAUY, 2008), a hormone involved in chlorophyll degradation (TAIZ et al, 2017). The determination of the leaf chlorophyll content is important because it permits inferences about a plant's photosynthetic capacity (CARVALHO et al, 2015). Hunt (1990) suggested that seedlings of satisfactory planting quality have a DQI of 0.2.…”

Section: Discussionmentioning

confidence: 99%

INFLUENCE OF EXOGENOUS APPLICATION OF ABSCISIC ACID IN GAS EXCHANGES OF Hymenaea courbaril L. (FABACEAE) SEEDLINGS SUBJECTED TO WATER DEFICIT

Freitas

Scalon

Dresch

et al. 2018

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The study was performed in the greenhouse of the Federal University of Grande Dourados (UFGD), from April to May, 2015. The aim of this study was to assess the effect of abscisic acid (ABA) different concentrations on Hymenaea courbaril L. seedlings water stress response and recovery after the rehydration. The following six treatments were evaluated: 1) Irrigation 0 µM ABA; 2) Irrigation + 10 µM ABA; 3) Irrigation + 100 µM ABA; 4) Irrigation without 0 µM ABA; 5) Irrigation without + 10 µM ABA and 6) Irrigation without + 100 µM ABA. The irrigation without treatment was performed by withouting water until the photosynthetic rate was close to zero, after which the plants were rehydrated. The plants were then irrigated daily to maintain 70% of the water holding capacity of the soil for a 12-day recovery period. The ABA doses applied exogenously during the irrigation without period neither prevented the reduction of photosynthetic activity nor optimized the recovery of the gas exchanges and the carboxylation efficiency of Rubisco after water and seedling quality restoration. The 100 µM ABA concentration promoted the degradation of chlorophylls independent of irrigation, showing that high concentrations of ABA may cause a residual effect on this species. The seedlings exhibited normal metabolic recovery after about 12 days of re-irrigation of the soil, which we attribute to species characteristics and not the tested treatments. Key words: Ecophysiology, restoration, water condition ResumoInfluência da aplicação exógena do ácido abscísico nas trocas gasosas de plântulas de Hymenaea courbaril L. (Fabaceae) submetidas ao déficit hídrico. O estudo foi realizado na casa de vegetação da Universidade Federal da Grande Dourados -UFGD, Dourados -MS, de abril a maio de 2015. O objetivo desse trabalho foi avaliar o efeito de diferentes concentrações de ácido abscísico (ABA) nas respostas ao estresse hídrico e na recuperação das mudas de Hymenaea courbaril L. após o reiirigação. Foram avaliados seis tratamentos sendo eles: 1) Irrigado sem ABA; 2) Irrigado + ABA 10 µM; 3) Irrigado + ABA 100 µM; 4) Sem irrigação e sem ABA; 5) Sem irrigação + ABA 10 µM; 6) Sem irrigação + ABA 100 µM. O tratamento sem irrigação consistiu na suspensão da irrigação até que a taxa fotossintética apresentasse níveis próximos de zero, quando as plantas foram reidratadas novamente com subsequente irrigação diária mantendo 70% da capacidade de retenção de água no solo, representando o período de restabelecimento, o qual durou 12 dias. As concentrações de ABA aplicadas exógenamente na época da suspensão da irrigação não evitaram a redução da atividade fotossintética e nem tão pouco otimizaram a recuperação das trocas gasosas e a eficiência de carboxilação da Rubisco após o restabelecimento normal de água e de qualidade das mudas. A concentração de 100 µM de ABA promoveu degradação das clorofilas independente da condição hídrica, evidenciando que altas concentrações de ABA podem provocar efeito residual nesta espécie. As mudas apresentaram restabeleci...

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Section: Discussionmentioning

confidence: 99%

INFLUENCE OF EXOGENOUS APPLICATION OF ABSCISIC ACID IN GAS EXCHANGES OF Hymenaea courbaril L. (FABACEAE) SEEDLINGS SUBJECTED TO WATER DEFICIT

Freitas

Scalon

Dresch

et al. 2018

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Leaf Angle as a Criterion for Optimizing Irrigation in Forest Nurseries: Impacts on Physiological Seedling Quality and Performance after Planting in Pots

Silva

Simões

Wendling

et al. 2023

Forests

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Seedling species with different architectures, e.g., mean leaf angles, are often subjected to the same irrigation management in forest nurseries, resulting in wasted water and fertilizer and reduced seedling quality. We aimed to evaluate whether irrigation volumes applied to tree seedling species with different leaf angles affect the physiological quality in forest nurseries and, consequently, performance after potting. We submitted nine seedling species with different mean leaf angles to four daily water regimes (8, 10, 12, and 14 mm). In the nursery, the following physiological attributes were considered to assess seedling quality: leaf water potential, daily transpiration rate, SPAD value, chlorophyll a and b, anthocyanins, carotenoids, and total nutrient content. After potting, we evaluated height and stem diameter over 120 days. Leaf angle can be used as a criterion for optimizing irrigation in forest nurseries, avoiding water and fertilizer wastage, and increasing physiological seedling quality. Leaf angle measurements combined with concurrent assessments of leaf traits are helpful in further understanding the effects of leaf angle variation and water regime on seedling quality. For positive leaf angles, an irrigation volume of 8 mm is sufficient to increase physiological seedling quality. Conversely, seedlings with negative leaf angles show the opposite response, requiring the largest irrigation volume (14 mm) to increase physiological seedling quality, except when the mean leaf area is small and concentrated in the upper half of the stem, which facilitates the access of irrigation water to the substrate and thus satisfies seedling water requirements. For all species, up to 120 days after planting in pots, the effect of the irrigation volume that provides greater growth and physiological quality at the end of the nursery phase is not overcome by other irrigation volumes applied.

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Respostas morfofisiológicas entre procedências de canafístula submetidas a diferentes condições hídricas e nutricionais

Cited by 2 publications

References 14 publications

INFLUENCE OF EXOGENOUS APPLICATION OF ABSCISIC ACID IN GAS EXCHANGES OF Hymenaea courbaril L. (FABACEAE) SEEDLINGS SUBJECTED TO WATER DEFICIT

INFLUENCE OF EXOGENOUS APPLICATION OF ABSCISIC ACID IN GAS EXCHANGES OF Hymenaea courbaril L. (FABACEAE) SEEDLINGS SUBJECTED TO WATER DEFICIT

Leaf Angle as a Criterion for Optimizing Irrigation in Forest Nurseries: Impacts on Physiological Seedling Quality and Performance after Planting in Pots

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