snow molds consume carbon sources contained in the inoculated wheat tissues but cannot effectively use wheat polysaccharide including fructans compared with mono- and disaccharides. Therefore, in snow mold inoculated wheat tissues, fructans are rapidly degraded, mainly by wheat enzymes, FEHs, to maintain necessary levels of mono- and disaccharides for metabolic demands under snow cover
in chicory hairy root cultures, transcription factor CiMYB5 displays co-expression with its target genes in response to different abiotic stress and phytohormone treatments, whereas correlations with CiMYB3 expression are less consistent. Oligofructan levels indicate that the metabolic response, while depending on the balance of the relative expression levels of fructan exohydrolases and fructosyltransferases, can be also affected by differential subcellular localization of different FEH isoforms. In chicory hairy root cultures CiMYB5 and CiMYB3 act as positive regulators of the fructan degradation pathway
regulation of the expression of FEH genes is a crucial factor for overwintering ability of fructan-accumulating cereals and grasses. The coordinated expression of FEH genes in wheat is related to the regulation of water-soluble carbohydrate accumulation from autumn to early winter and fructan consumption under snow cover as well as energy supply. Wheat FEHs also play an important role in the varietal difference in freezing tolerance and snow mold resistance. Cooperative expression of 6-FEH and 1-FEH genes might be related to the seasonal changes and varietal difference in mono- and disaccharide contents
fructan 1-exohydrolase enzymes are involved in inulin degradation in the roots of chicory. Higher enzyme expression in cold temperatures can decrease the quality and the quantity of the inulin
1-FEH activities are higher in all DH 338 stem segments under drought, as compared to irrigated plants after 10 days after anthesis (DAA), although in the sheath the difference disappears during the later stages. Under drought, 1-FEH activity tends to increase in the peduncle and the penultimate internode after 14 DAA, while it remains similar between treatments in the lower parts and sheath in DH 307. The combined 1-FEH and 6-FEH activities are particularly important during the later stages in drought treated DH 338. FEH dynamics under drought may play a more essential role in var. DH 307 than in var. DH 338
fructan exohydrolase, FEH, gene plays a key role in fructan metabolism associated with wintering ability, especially for snow mold resistance. Gene 1-FEH w1 is thought to code a trimming enzyme
fructan metabolism in Agave tequilana exhibits changes in fructan content, type, degree of polymerization (DP), and molecular structure, overview. Analysis of the specific activities of involved vacuolar fructan active enzymes (FAZY) in Agave tequilana plants of different age and the biosynthesis of fructooligosaccharides (FOSs). Fructan hydrolysis is carried out by FEH enzymes, that remove terminal fructosyl units from fructan chains, to fulfill a diverse set of functions in the plant, such as energy supply during plant growth, maintenance of the osmotic pressure in the vacuoles, and modulation of the oligofructans amounts under oxidative stress and freezing tolerance
fructans are polymers of fructose and one of the main constituents of water-soluble carbohydrates in forage grasses and cereal crops of temperate climates. Fructans are involved in cold and drought resistance, regrowth following defoliation and early spring growth, seed filling, they have beneficial effects on human health and are used for industrial processes. Fructan metabolism is under the control of both synthesis by fructosyltransferases (FTs)and breakdown through fructan exohydrolases (FEHs). The accumulation of fructans can be triggered by high sucrose levels and abiotic stress conditions such as drought and cold stress. The activities of enzymes involved in fructan synthesis and breakdown, the expression levels for the corresponding genes and levels for water-soluble carbohydrates are determined following pulse treatments with abscisic acid (ABA), auxin (AUX), ethylene (ET), gibberellic acid (GA), or kinetin (KIN)
in hairy root cultures with induced fructan accumulation, co-expression of transcription factor CiMYB5 and FEH genes is correlated with changes in oligofructan profiles upon stress and hormone treatments