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O algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium Hutch.) é uma planta considerada sensível à deficiência de oxigênio do solo. O objetivo deste trabalho foi avaliar a fisiologia e produtividade do algodoeiro cultivar CNPA 7H, em casa de vegetação, submetido à anoxia, por encharcamento do solo, na fase de plântula. Foram conduzidos dois experimentos em blocos ao acaso, com sete períodos de encharcamento e seis repetições. No encharcamento de quatro dias ocorreu uma redução na atividade da invertase de 76,69%, da beta-amilase de 77,37% e da redutase do nitrato de 51,10%. A fotossíntese foi afetada a partir do primeiro dia e alcançou decréscimo de 58,63% no décimo quarto dia de encharcamento; os carboidratos foram acumulando-se nas folhas, caule e raízes. O rendimento de algodão em caroço foi reduzido em 35,76% no décimo dia do estresse anoxítico. Annual cotton (Gossypium hirsutum L. r. latifolium Hutch.) is known as a sensitive plant to oxygen deficient soil. The purpose of this work was to investigate the physiology and yield of cotton CNPA 7H cultivar, grown under greenhouse conditions and exposed to oxygen shortage, by soil flooding, at seedling stage. Two experiments were carried out and the experimental design was a randomized complete block with seven flooding periods and six replications. At the fourth day of flooding regime a decrease of 76.69% invertase activity, 77.37% of beta-amilase, and 51.10% of nitrate reductase was observed. The photosynthesis activity was affected from the first day, being reduced to 58.63% in the fourteenth day of flooding; the carbohydrates were accumulated on leaves, stem and roots. Cotton yield was reduced to 35.76% at the tenth day of flooding stress

Fisiologia e produtividade do algodoeiro em solo encharcado na fase de plântula