Action of ethylene, 1-methylcyclopropene and silver thiosulfate in two developmental stages of potted ornamental pepper

Paula Cristina Carvalho Lima,Wellington Souto Ribeiro,Fernando Luiz Finger,Milena Maria Tomaz Oliveira,Lucas Cavalcante Costa

doi:10.14295/oh.v23i3.1036

Abstract

The species of Capsicum genus have great genetic variability with enormous potential for marketing as ornamental potted plants. The exposure at ethylene induces various deleterious responses during plants life cycle, but there are few studies on how the ethylene affects early developmental stages of these ornamental plants. Thus, this study aimed to evaluate the effects of the application of ethylene and ethylene inhibitors, 1-methylcyclopropene (1-MCP) and silver thiosulphate (STS) in two early development stages (seedling or initial flowering) of potted ornamental peppers of the cultivars ‘Calypso’ and ‘MG 302’. Cultivar ‘MG 302’ showed intermediate sensitivity to ethylene, while the cultivar ‘Calypso’ showed complete abscission of leaves when exposed to 10 µl of ethylene for 48 hours in both development stages. Plants treated with 1-MCP showed similar durability to control for both varieties and developmental stages, and the treatment with 1-MCP + ethylene was beneficial only for ‘MG 302’. STS was the most efficient substance in delaying the ethylene, wherein at stage 1 there was no leaf abscission and at stage 2 had much reduced leaf abscission occurred, regardless the cultivar. Treatment with STS + ethylene was efficient only at stage 1 for ‘Calypso’ and at stage 2 for ‘MG 302’. According to the data, cultivars showed different levels of sensitivity to ethylene, ‘Calypso’ is very sensitive and ‘MG 302’ showed intermediate sensitivity. Regardless the cultivar, STS treatment significantly blocked the ethylene action in both development stages and the use of 1-MCP was less efficient

Highlights

When evaluating the ethylene sensitivity within plant families, not all families have been found to have the same level of sensitivity between species or even among cultivars (MACNISH et al, 2011), because multiple receptors might be involved in contrasting responses in different tissues, as well as different developmental stages or different environmental stresses (IQBAL et al, 2017)
The use of inhibitors treatments affect at different levels the ethylene signaling pathway, reveals collectively an intricate network of interactions as exemplified by numerous studies of senescence in flowers reviewed in Ferrante et al (2015)
This study aimed to evaluate the effects of the application of ethylene and ethylene inhibitors, 1-methylcyclopropene (1-MCP) and silver thiosulphate (STS) in two developmental stages of potted ornamental peppers of the cultivars ‘Calypso’ and ‘MG 302’

Summary

Introduction

When evaluating the ethylene sensitivity within plant families, not all families have been found to have the same level of sensitivity between species or even among cultivars (MACNISH et al, 2011), because multiple receptors might be involved in contrasting responses in different tissues, as well as different developmental stages or different environmental stresses (IQBAL et al, 2017). Ethylene is a developmental regulator that operates in manifold physiological processes in all tissues throughout the plant life cycle (VAN DE POEL et al, 2015), regulates growth and senescence, depending on its concentration, timing of application and plant species (KHAN et al, 2008). The use of ethylene inhibitors such as 1-methylcyclopropene (1-MCP) and silver thiosulfate (STS) help to control of ethylene action on ornamentals plants (SEGATTO et al, 2013).

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