象草和杂交狼尾草细胞壁组分及乙醇理论产量动态分析

Changes of the content and biomass of cell wall components and calculated ethanol yields in Pennisetum purpureum and hybrid Pennisetum during the growing period

本试验系统研究了南京地区苏牧2号象草和杂交狼尾草细胞壁各组分含量、总量和木质纤维素乙醇理论产量（CEY）随生长天数的变化规律。结果表明,随着生长时间的延长,两品种茎和叶中纤维素（CEL）含量逐渐降低,茎中半纤维素（HMC）和酸性木质素（ADL）含量逐渐上升。不同生长阶段,两品种叶中CEL含量显著（P〈0.01）高于茎,HMC含量显著（P〈0.01）低于茎,象草叶中HMC含量显著（P〈0.01）高于杂交狼尾草。移苗后114-173d,象草茎中CEL含量显著（P〈0.05）低于杂交狼尾草,而HMC（P〈0.01）和ADL（P〈0.05）含量显著高于后者。移苗后83-114d,两品种细胞壁各组分总量和总CEY均稳步增加;茎和叶组织之间,两品种之间的CEL和ADL总量均无显著差异（P〉0.05）;HMC主要集中在茎组织中;两品种间总CEY以及来源于叶的CEY无显著差异,但两品种来源于茎的CEY显著（P〈0.01）高于叶。移苗后114-173d,细胞壁各组分总量和总CEY急剧增加,增加的产量更多来源于茎组织;两品种之间,HMC和ADL总量以及来源于叶的CEY均无显著差异,但杂交狼尾草纤维素总量和总CEY显著高于苏牧2号象草（P〈0.01）。

Changes in the cell wall components,biomass and calculated ethanol yields（CEY）from cellulose and hemicelluloses of Pennisetum purpureumcv.Sumu No.2（PP）and hybrid Pennisetum（HP）during 83-173 days after transplanting seedlings（DATS）in Nanjing were studied.With an extension of the growing period,the cellulose（CEL）contents of stems and leaves gradually decreased,but the hemicelluloses（HMC）and the acid detergent lignin（ADL）contents of stems gradually increased in these two species.During the observed growing period,the CEL content of leaves was significantly（P〈0.01）higher,while the HMC leaf contents were lower（P〈0.01）than those of stems,and the HMC of leaves in PP was higher（P〈0.01）than that in HP.During 114-173 days,the CEL content of stems was lower（P〈0.05）,while the HMC（P〈0.01）and ADL（P〈0.05）were higher in PP than those in HP.During 83-114 days,the biomass of all cell wall components and the total CEY steadily increased in PP and in HP.There was no significant difference between the two species in CEL and ADL biomass,however,the HMC of stems was much higher than that in leaves（P〈0.01）.The total CEY and CEY of leaves between the two species were not significantly different,but the CEY of stems was much higher than that of leaves（P〈0.01）.During 114-173 days,the biomass of all cell wall components and total CEY had been increasing dramatically,and the majority of the increased yields came from the stems.The HMC,ADL and the CEY of leaves had no obvious difference between the two species,but the biomass of CEL and the total CEY in HP was significantly（P〈0.01）higher than those in PP.