An Analysis of the Response of Winter Wheat (Triticum aestivum) Components to Cycocel (Chlormequat) Application

Abstract

Field-grown winter wheat (Triticum aestivum cv. Avalon) plants were treated with a formulation of 1.25 % Cycocel (2-Chloroethyl trimethylammonium chloride) and 0.5% Ll-700 (acidified soya lecithin) at the beginning of stem extension in order to identify the component parts that are most affected and on which an assessment of the effectiveness of Cycocel formulations can be based. Cycocel consistently reduced culm length due to the reduction of the lengths of the first three basal internodes by 43, 37 and 15 % respectively. In absolute terms, the second internode contributed most to stem reduction, a feature retained up till maturity. There was evidence of relative dry matter redistribution from the stem to the leaves, while growth rate was slowed down such that treated plants matured later than the controls. The youngest fully opened leaf at the time of Cycoce! application showed a transient reduction in length, area and dry weight, while total leaf area was largely unchanged. From the results, measurement of the lengths of the first two internodes proved to be the most sensitive indicator of effective Cycocel uptake.

Efeitos de reguladores de crescimento na elongação do colmo de trigo

“…Os resultados encontrados com clormequat diferem dos relatados para arroz tratado com 0; 1 ou 2 L ha -1 do produto, em que não foram encontradas diferenças significativas para a altura de plantas (BUZETTI et al, 2006); no entanto, redução do comprimento do colmo também foi encontrada para plantas de trigo, cultivar Avalon, tratadas com clormequat (OLUMEKUN, 1996) e alface (Lactuca sativa L.) no florescimento (PASSAM et al, 2008). Os resultados encontrados com trinexapac-etil assemelham-se aos de Zagonel e Fernandes (2007).…”

“…Os resultados com clormequat e trinexapac-etil são semelhantes aos que ocorreram com o comprimento do colmo, e isso acontece porque o pedúnculo é a estrutura que mais contribui para o crescimento em altura e também onde se verifica o crescimento final do colmo (SOBRINHO; SOUZA, 1983). O resultado com clormequat difere do encontrado para trigo, cultivar Avalon, cuja redução do pedúnculo não foi significativa (OLUMEKUN, 1996). No entanto, estes autores aplicaram o regulador no início da elongação do caule, como na época 1 deste estudo.…”

Accumulation of biomass and bioenergy in culms of cereals as a factor of straw cutting height

“…Introduction of chemical growth-retardants to agricultural practices effectively limited culm length, which, in turn, improved the resistance of the crop to lodging (Berry et al, 2004;Tripathi et al, 2003). Olumekun (1996) reported that the Cycocel growth retardant (i.e. 2-chloroethyl-trimethylammonium chloride) reduces the length, but does not reduce the weight of the wheat culm.…”

Influence of CCC and Trinexapac-Ethyl on the Expression of Genes Involved in Gibberellic Biosynthesis and Metabolism Pathway in Isogenic Line With Rht12 Dwarfing Gene

“…Another method to prevent plant lodging is application of plant growth regulators [Olumekun 1996, Kulig et al 2001, Rajala and Peltonen-Sainio 2001, Stachecki et al 2004, Matysiak 2006. To control lodging, they are applied at the beginning of stem elongation (e.g.…”