Physiological, phenometric and productive changes in soybean crop due to the use of kinetin

Abstract

A fast growth in the use of substances that increase soybean yield through physiological or morphological changes, such as cytokinin, has taken place in recent years. This study aimed at assessing the effect of the application time of cytokinin as kinetin on soybean crops. The experiment was carried out under field conditions, using four treatments (control and kinetin at the vegetative stages V4, V6 and V4 + V6), with five replications, in completely randomized blocks. Physiological (nitrate reductase and peroxidase activity, H2O2 content and lipid peroxidation) and phenometric parameters (leaf and root dry mass), as well as yield, were evaluated. The application of kinetin at V4, V6 or V4 + V6 increased the activity of the nitrate reductase enzyme and reduced stress (evaluated via lipid peroxidation and hydrogen peroxide content), in addition to raising the dry matter content. All these characteristics resulted in increased yield. However, the most significant effects were caused by the application of kinetin at V6, which increased yield in 20 %, in relation to the control.

Heading Back and Pinching Affects the Biochemical and Physiological Parameters of Annual Moringa cv. PKM-1 Leaves

“…Also, the level of auxin and cytokinin decides the NR-ase activity in crops. Soares et al [18] reported that increased cytokinin synthesis promoted nitrate reductase activity in soybean. Increased auxin content also promotes nitrate reductase enzyme production according to Anbarasu [19]…”

Efeitos Da Citocinina Benzilaminopurina Na Estaquia Da Pitaia

“…al, (2008) trabalhando com Annona glabra citam o efeito a citocinina aplicada em áreas foliares no aumento da quantidade de clorofila e cloroplastos. Soares et al (2017) aplicaram citocinina em plantas de Glycinemax relatam o aumento dos níveis da enzima nitrato redutase e aumento da eficiência de absorção de nitrogênio. Esses incrementos podem explicar o aumento na matéria seca por permitir a planta de pitaia o maior acúmulo de esqueletos de carbono.…”

Morphological and Agronomic Characteristics of Common Beans Subjected to Seed Priming With Different Doses of N6-benzyladenine

“…The average reduction of 35.92% verified in the minimum points for the leakage of electrolytes, represents the maintenance of the integrity of the cellular membranes. The cytokinins maintain cell membrane integrity, through the balance between cytokinin and abscisic acid (Fioreze, Rodrigues, Carneiro, Silva, & Lima, 2013), preventing the transport of proteases from the vacuole to the cytoplasm, hydrolyzing soluble proteins of plasma membranes, chloroplasts, and mitochondria, blocking the oxidation of fatty acids and inhibiting the formation and degradation of free radicals (Soares et al, 2017).…”

“…The application of biostimulants containing cytokinin or the isolated use of the growth regulator, via foliar applications, has shown a strong tendency to increase the yield of soybean crop (Soares, Dourado Neto, Fagan, Teixeira, & Pereira, 2017). Borges, Torres Junior, Neves, Cruvinel, Santos, and Matos (2014), when applying N6-benzyladenine (6-BA) at the end of soybean flowering, found a reduction of pod abortion, and an increase of stem diameter, the yield of components and the crop.…”