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Physiology and morphology of common bean plants under water deficit Common bean plants under water deficit suffer morphological, physiological and hormonal changes. The objective of this study was to assess and characterize physiological and hormonal variables of common bean plants of two varieties (‘IAC Imperador’ and ‘IAC Milênio’), grown under different irrigation intervals starting at the pre-flowering phenological stage (R5).The plants were grown in pots and were submitted to four, eight, twelve and sixteen days without irrigation in the reproductive phase. By the end of each irrigation interval, it was assessed the substrate water content, leaf relative water content, leaf water potential, stomatal conductance, transpiration, photosynthesis, ethylene production and proline production. At the end of the crop cycle, it was measured the leaf, stem and root dry weight, and the production components. The plants of both cultivars showed significant decrease in the substrate water content, stomatal conductance, transpiration and photosynthesis rates with just four days without irrigation, decreasing more and more until sixteen days without irrigation. The variable ethylene production showed significant difference between the factors cultivars and irrigation intervals, with higher values for IAC Imperador. There was no statistical difference between the cultivars for leaf water content, leaf water potential, leaf and root dry weight, number of pods per plant and yield per plant. Both cultivars presented differences for the variables ethylene, proline and number of grains per plant when under water deficit, and therefore, sowed different results in this situations.

Fisiologia e morfologia de plantas de feijão sob deficiência hídrica