Compensatory response of cotton plants to simulated carpophagic pest injury / Resposta compensatória de plantas de algodoeiro a injúria simulada de pragas carpofágicas

José Ednilson Miranda, Bruna Mendes Diniz Tripode, Ismael Ribeiro da Rocha Silva

Resumo


Due upland cotton crop has a relatively long cycle on Brazilian Savannah areas, varying from 180 to 220 days, abscission and replacement of floral structures is frequent although variable along the phenological phases. The reproductive phase occurs from 45 days after plant emergence until close to the harvest. The objective of this study was to measure the ability of cotton plants to compensate losses caused by carpophagic insects by producing new floral structures. Four cotton cultivars (FM913GLT, FM980GLT, FM966LL and FM975WS) were sowed in an irrigated area, whose soil is characterized as dystrophic latosol. The treatments were arranged in a factorial scheme, with the cultivar being the main factor and the intensity of the injury caused manually by the removal of floral structures as the secondary factor. Simulated damages consisted of five levels of removal of floral buds, flowers and bolls at 75 days after emergence (DAE). We recorded the number of floral structures present in the plants at 140 DAE and at the harvest. The damage boundary (Db) varied among the cultivars, demonstrating a differentiated response of tolerance to injury. FM980GLT and FM975WS were able to compensate and overcompensate the losses; the same does not happen to FM913GLT and FM966LL. We observed tolerance and linearity phases in all the cultivars but FM966LL. FM980GLT showed highest response capability after be injured. The cotton plants compensated for the loss of structures up to a certain limit of injury, which varies with the cultivar. Overcompensation and compensation occurred through the replacement of new structures while the compensatory response into increase in the weight of bolls did not happen.


Palavras-chave


Gossypium, shedding, abscission, compensation, insect.

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Referências


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DOI: https://doi.org/10.34115/basrv4n5-016

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