Water stress effect on photosynthesis and fructose 2,6- Bisphosphate content in triticale (Triticosecale Witt) leaves

Abstract

Photosynthetic sucrose formation, fructose 2,6 bisphosphate Fru-2, 6-P2 content and related enzymes were investigated in control and water stressed triticale (Triticosecale Witt, var.GA-1093) leaves. The water stressed plants accumulated Fru-2,6-P2 and they also showed reduced sucrose formation and low photosynthetic rates. Activities of fructose 1,6-bisphosphatase and sucrose phosphate synthase were reduced in water stressed plants. Activity of fructose 6-phosphate 2-kinase was high in stressed plants, while the level of fructose 2,6 bisphosphatase was low. Data suggest that low water potential results in an altered Fru-2,6-P2 metabolism which modulates sucrose formation in the leaves of triticale.