Resumo

ARGENTEL-MARTINEZ, Leandris et al. Temperature effects on protein and carbohydrates metabolism and the vegetation index in wheat (Triticum durum L.). cultrop [online]. 2018, vol.39, n.3, pp. 49-57. ISSN 1819-4087.

An experiment, under field conditions, in the Valle del Yaqui, Sonora, Mexico, was established which consisted of raising the temperature of the wheat at 2 °C above the ambient canopy temperature during the crop phenology to determinate warming effect on total soluble proteins (PST) and carbohydrates (CST) in stems and grain and the total soluble carbohydrates mobilization rate within the stem (TMC), and the NDVI. CIRNO C2008, a crystalline wheat variety was used as an experimental model. The PST, due to warming effect, decreased significantly in the heading phenophase in more than half of the Control treatment, aspect that denotes an early senescence. However, the CST content in the stem was higher in the heat treatment when it was determined 10 days after flowering. In the maturity there were no significant differences. The imposed heat did not affect the TMC. In the grain, heat did not affect the PST content but the CST content increased. The NDVI, due to heat effect, decreased from the stem elongation to maturity. The maximum value occurred, in the treatments, in flowering, demonstrating warming tolerance of the used variety to the occurrence of this phenophase. Such results suggest the feasibility of using CIRNO C2008 as a possible progenitor for breading in front heat stress

Palavras-chave : heat; phenology; climate change.

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