engleski

Fructan accumulation in the internodes and photosynthetic performance during development of two barley cultivars

Fructans represent major temporary stem carbon storage which are accumulated in the stem and leaves. In barley (Hordeum vulgare L.) stem, accumulated fructans can be easily mobilized in the grain after flowering which significantly affects the overall yield. The aim of this study was to reveal the dynamics of remobilization of the fructan reserves in the three lower internodes with transcription levels of the genes involved in their synthesis and degradation and efficiency of photosystem II during development in two spring barley cultivars Astor and Jaran. Cultivar Jaran with better photosynthetic efficiency, as opposed to cultivar Astor, had lower fructan content. This results can be explained by coordinated expression pattern of the sucrose: sucrose 1- fructosyltransferase (1-SST), sucrose: fructan 6-fructosyltransferase (6-SFT) involved in synthesis and the expression in fructan-1- exohydrolase (1-FEH) gene involved in fructan remobilization leading to better sink strength and generally lower fructan content in the stem of cultivar Jaran. Fructan synthesis and remobilization are under a strong influence of genotype and enzyme activities were directed towards synchronized synthesis of fructans and their mobilization to the grain. The obtained results will contribute to the selection and breeding processes of spring barley cultivars.

fructans, internode, 1-SST, 6-SFT, FEH

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