Carbohydrate Partitioning in 185 Accessions of Gramineae Grown Under Warm and Cool Temperatures

摘要: Summary Partitioning of carbohydrate reserves into fructan and starch should not be considered as alternativeforms storage in grasses. Both polymeric forms occurred concurrently leaves cool-season Temperature had a profound effect upon the accumulation TNC, sucrose, 178 out 185 grass accessions included this study. Six seven exceptions were warm-season plants that probably photosynthesize slowly at 10 °C/5 °C. The only accession to accumulate much TNC 25 °C/15 °C was Elymus tsukushiensis . Enhanced during cool temperatures supports hypothesis fructans may when carbon fixation exceeds plant translocation utilization. fact accumulated 123 mg gSDW 1 warm temperatures, indicates are always prerequisite for intact all species. However, species Gondwanic origin, those belonging genera Danthonia, Stipa, Oryzopsis , Phragmities apparently do produce even subjected temperatures. Warm-season under either or cold conditions. Fructan many associated with high sucrose concentrations previously reported. correlations between leaf starch, taken over large number species, rather low. We conclude is an alternative any other form because,on average, each nonstructural component higher, growing conditions conducive accumulation, than content expense carbohydrate. Because mean similar two types within temperature, except 10°C/5 grown plants, we ancillary storage. Such role compatible vacuole allows photosynthesis continue pools saturated. Interestingly, grasses experiment, which did synthesize fructan, begin growth later spring metabolize fructan.