Abstract:ResumoAs recomendações de reguladores de crescimento cloreto de mepiquat (CM) geralmente não consideram as diferenças entre cultivares de algodoeiro utilizadas para o cultivo. O trabalho teve como objetivo avaliar o crescimento e o desenvolvimento de cultivares de algodão ante a embebição das sementes com regulador de crescimento cloreto de mepiquat, visando à sua caracterização quanto à resposta ao tratamento. Foram utilizadas as cultivares IPR-120, IAC-24, CD-405, Delta Opal e Fibermax 966, cujas sementes fo… Show more
“…In a recent study, Almeida & Rosolem (2012) observed that the application of MC to cotton seeds decreased shoot length, but had no significant effect on dry matter production, root length, shoot:root ratio or leaf area:root length ratio. However, Nagashima et al (2011) concluded that cotton seeds treated with MC decreased shoot dry matter by 62%, while the leaf area decreased 52%.…”
Mepiquat chloride (MC) is widely used for controlling cotton plant growth. Shoot growth modifications may affect root growth and, consequently, interfere with the cotton sensitivity to water deficit. This study aimed at evaluating the water deficit effects, in initial phenological stages of cotton plants from seeds treated with MC doses, on shoot and root growth. Two experiments were carried out in a greenhouse, in Santa Helena de Goiás, Goiás State, Brazil, in a randomized blocks design, in a 4x4 factorial scheme: four growth regulator doses (0 g, 2 g, 4 g and 8 g of active ingredient of MC per kg of seed) and four water stress conditions (without water deficit and initial water deficit in three vegetative growth stages: V1, V3 and V5), with four replications. Shoot and root dry matter, as well as cotton plant height, decreased with the increase of MC doses. The water deficit between V1 and V5 reduced shoot and root dry matter. The water deficit also increased the inhibitory effect of MC applied via seeds on cotton plants shoot and root dry matter.
“…In a recent study, Almeida & Rosolem (2012) observed that the application of MC to cotton seeds decreased shoot length, but had no significant effect on dry matter production, root length, shoot:root ratio or leaf area:root length ratio. However, Nagashima et al (2011) concluded that cotton seeds treated with MC decreased shoot dry matter by 62%, while the leaf area decreased 52%.…”
Mepiquat chloride (MC) is widely used for controlling cotton plant growth. Shoot growth modifications may affect root growth and, consequently, interfere with the cotton sensitivity to water deficit. This study aimed at evaluating the water deficit effects, in initial phenological stages of cotton plants from seeds treated with MC doses, on shoot and root growth. Two experiments were carried out in a greenhouse, in Santa Helena de Goiás, Goiás State, Brazil, in a randomized blocks design, in a 4x4 factorial scheme: four growth regulator doses (0 g, 2 g, 4 g and 8 g of active ingredient of MC per kg of seed) and four water stress conditions (without water deficit and initial water deficit in three vegetative growth stages: V1, V3 and V5), with four replications. Shoot and root dry matter, as well as cotton plant height, decreased with the increase of MC doses. The water deficit between V1 and V5 reduced shoot and root dry matter. The water deficit also increased the inhibitory effect of MC applied via seeds on cotton plants shoot and root dry matter.
The influence of antigibberelin on the growth, development and productivity of eggplant was investigated. It was established that the use of tebuconazole and chlormequat chloride is a highly effective tool for regulation of morphogenesis and productivity of eggplant. We found that retardants slowed the growth of plants, and increased the number of leaves and leaf area and dry substance weight of the whole plant. Under the influence of Esfon ethylene producers the inhibition of the growth process was not accompanied by increase of the number, weight and area of leaves.Antigibberelin agents caused the thickening of chlorenchyma and the growth of the columnar cells and cell sizes of spongy parenchyma. Under the action of agents the thickness of the upper and lower epidermis of the leaf increased. As a result of mesostructural and morphometric changes of leaf structure under the influence of retardants the leaf index and specific leaf surface density increased.The growth inhibitory agents increased the chlorophyll content in leaves and caused the growth of chlorophyll index in crops.Retardants reduced the content of sugar and starch in leaves because of their enhanced outflow to fruits, the amount of which was predicted to be greater. Under the influence of Esfon the flow of carbohydrates to the acceptor areas was slower.The use of retardants of triazole and onium origin positively influenced the formation of productivity elements of the culture, which led to increase in the fruit yield. The use of tebuconazole was found to be the most effective.
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