Abstract
ABSTRACT Inhibiting seedling vegetative growth may be a strategy for improving modulation against biotic and abiotic stresses after transplanting. The objective of this study was to evaluate morphological responses of yellow passion fruit (Passiflora edulis) seedlings to growth inhibition resulted from the application of an inhibitor of gibberellin biosynthesis. The experiment was carried out in a greenhouse using seedlings grown in 290 cm3 polyethylene tubes. At 40 days after emergence, trays containing the seedlings were immersed in solutions at concentrations of 0, 40, 80, 120 and 160 mg (Paclobutrazol) PBZ L-1 up to substrate saturation. These five treatments were laid out in a randomized block design with four replicates. At 15, 30 and 45 days after PBZ application (DAA), basal stem diameter was measured; at 45 DAA, stem diameter, individual leaf area, specific leaf area, root diameter and root volume were measured, lignin content and the anatomy of leaves, stems, and roots were analyzed. Triazole-induced anatomical alterations in stems, leaves and roots cause morphological traits and intensify the specific reagent staining of phenolic compounds and lignin in yellow passion fruit (Passiflora edulis) seedlings.
Highlights
The genus Passiflora is estimated to contain over 400 species of which approximately 146 are native to Brazil (Oliveira et al, 2019; Koch et al, 2019)
The objective of this study was to verify if PBZ could conditioning morphological characteristics alterations and biosynthesis of secondary compounds related to defense mechanism in yellow passion fruit seedlings
Individual leaf area of yellow passion fruit seedlings is related to effect of PBZ in reduce the epidermis elongation
Summary
The genus Passiflora is estimated to contain over 400 species of which approximately 146 are native to Brazil (Oliveira et al, 2019; Koch et al, 2019). Yellow passion fruit (Passiflora edulis) is the main cultivated species due to its high fruit yield, juice content, plant vigor and market acceptance (Ferreira et al, 2016). Brazil is the world’s top producer and consumer of yellow passion fruit (Faleiro; Junqueira, 2016). In 2017, 554,598 t of fruits were produced on 4 1,090 ha, and the Northeast region stands out with 60.92% of the country’s production (Sidra, 2019). Yellow passion fruit yield ranges from 12 to 15 t ha-1; it has a yield potential varying between 30 and 35 t ha-1 (Nogueira Filho et al, 2011). Longevity and productivity of yellow passion fruit orchards are limited by poor soils, climate adversities, and, especially, diseases such as fusarium wilt Passiflorae), collar rot (Fusarium solani) (Fischer; Rezende, 2008), and fruit hardening (mainly cowpea aphid-borne mosaic virus) (Cerqueira-Silva et al, 2014)
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