Leaf Gas Exchange and Flowering of Mango Sprayed With Biostimulant in Semi-Arid Region

Abstract

<jats:p>ABSTRACT The aim of the present study was to evaluate the effect of biostimulant containing amino acids and yeast extract on the physiological and reproductive characteristics of mango cv. Tommy Atkins during the shoot maturation phase in tropical semi-arid region. The experimental design consisted of randomized blocks with five treatments, five replications and five plants per plot. Treatments consisted of: T1) two foliar sprays with [biostimulant + KCl] + two foliar sprays with K2SO4; T2) No biostimulant and four foliar sprays with K2SO4; T3) three individual foliar sprays with biostimulant and one foliar spray with K2SO4; T4) two foliar sprays with biostimulant and two foliar sprays with K2SO4; and T5) two foliar sprays with [biostimulant + K2SO4] + one foliar spray with K2SO4. There is a positive effect of the biostimulant containing amino acids and yeast extract on transpiration, internal CO2 concentration, water-use efficiency and number of reproductive and non-differentiated shoots of mango cv. Tommy Atkins cultivated under tropical semi-arid condition, with attenuating effect on plant abiotic stress. For shoot maturation of mango cv. Tommy Atkins, three foliar sprays with biostimulant containing amino acids and yeast extract (10 mL per plant) and one with K2SO4 (3%), starting at 45 days after paclobutrazol application (T3), can be recommended.</jats:p>

WATER DEFICIT ON GROWTH AND PHYSIOLOGICAL INDICATORS OF Bidens pilosa L. AND Bidens subalternans DC.

“…survival in water scarcity conditions. However, this watersaving mechanism via stomatal closure can impair plant photosynthesis, limiting the growth of plants (NEGIN; MOSHELION, 2016;MUDO et al, 2020).…”

Gas exchanges and photosynthetic pigments of ‘Tommy Atkins’ mango as a function of fenpropimorph

“…The water use efficiency relates the water volume lost by the plant with the photosynthetic activity. Mudo et al (2020) observed that this behavior favored floral induction in the same mango cultivar grown under similar conditions.…”

“…Under suitable environmental conditions, plants tend to have high physiological activity, including high transpiration rates (Silva et al, 2009). Mudo et al (2020) observed that high transpiration rates and internal CO 2 concentrations are positively related to a larger number of reproductive buds, consequently favoring flowering and fruit yield.…”

Organic acids allied with paclobutrazol modify mango tree ‘Keitt’ flowering

“…In the semi-arid tropical region, the management of the mango tree flowering comprises several aspects such as; irrigation, pruning, fertilization (OLDONI et al, 2018), use of phytoregulators (CAVALCANTE et al, 2020), branch maturation (CAVALCANTE et al, 2018) and application of nitrate salts (DAVENPORT, 2009). These practices allow scheduling the harvest for more commercially attractive periods (OLIVEIRA et al, 2015).…”

“…The use of organic substances, such as fulvic acids (FA) and free amino acids, is proposed to prepare mixes, mainly due to the expected effect of complexing ions and molecules, ensuring greater absorption efficiency due to increased transport in the soil to the roots and membranes permeability (BALDOTTO; BALDOTTO, 2014;SILVA, et al, 2020). In addition, these molecules have stressreducing characteristics; amino acids promote anti-stress effects and participate in the synthesis of chlorophylls (TAIZ et al, 2017).…”