Abstract
In semiarid regions rainfall is often scarce and erratic in space and time, making valuable the exploration of news genotypes with superior behavior in dry land systems. Tricepiro (X Triticosecale Wittmack x X Agrotriticum Ciferri & Giacom) is a synthetic cereal with long cycle and high biomass production in semiarid environments. However its performance under controlled water stress has not yet been evaluated. The aim of this work was to investigate the effect of water stress on tricepiro genotypes in comparison with their progenitors: triticale and trigopiro. Morphophysiological traits related to forage yield were evaluated in the greenhouse and the field. In the greenhouse, water potential, stomatal resistance, root biomass and wilted/green leaves were significantly associated with forage production under severe water stress [leaf water potential (WP) = -3 MPa]. In the field, under mild-moderate stress (leaf WP = -1.23 MPa), forage yield was highly related to plant height and leaf area index. We found that under water stress tricepiro performed similar to triticale, and both were superior to trigopiro. Among tricepiros, L62 and the line RC50 were the best performing genotypes. Hence, tricepiro has potential to diversify cropping systems in Semiarid Regions.
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