Influence of gibberellic acid on the architecture of common bean plants at early growth development - DOI: 10.4025/actasciagron.v32i2.3721

Abstract

The low height of pod insertion in beans is due to the low height of its basal internodes that lead to problems in plant management, low grain quality and inefficient commercial harvest. The objective of this work was to evaluate the effect of exogenous gibberellic acid (GA₃) to increase basal internodes of bean seedlings. The experiment was conducted in greenhouse and field growth conditions, using two common bean genotypes. In both, the seeds were treated with 10 µM GA₃; spraying on seedling shoot (hook, primary leaves, first and second trifoliate leaf) with 10 µM GA₃, and control using distilled water. The plants were harvested at V4 stage. GA₃ promoted significant increase of the hypocotyl and epicotyl (first internodes 9 cm) length, and decrease of their respective diameters, particularly with GA₃ seed treatment. The genotype BAF#55 was more responsive to GA₃ treatments than Carioca Iapar#81. Moreover, a reduction in leaf area was observed in all dimensions (length-to-width ratio). In the seed treatment, the emergence was 34% for IAPAR#81 against 71% for BAF#55, and around 90% for controls. It indicates that GA₃ modifies plant architecture, whose response depends on genotype, the environment and the physiological development stage of the plant.