树木木质素含量的遗传变异研究进展

针对木质素含量这一数量性状的遗传变异规律进行了综合评述。木质素含量在种、群体、个体等不同层次上均表现出复杂的变异模式，环境因素有着不同程度的影响。木质素的合成途径有可能存在多条途径的替换或切换，然而利用基因工程技术对某些酶如ＰＡＬ、４ＣＬ、Ｃ４Ｈ和ＣＣＲ等酶改造时，在一定的程度上可以降低木质素含量，而对其它酶如ＯＭＴ、ＣＡＤ和Ｆ５Ｈ等酶改造时，并不降低木质素含量，有此酶基因的反义转化可以改造木质素

Advance in Studies on Genetic Variation of Lignin Content in Tree Species

Genetic variation of the quantitative trait lignin content was remarked in detail.According to many reports,it can be seen that lignin content possesses very complicate patterns of variation at levels of species,population and individual.Impacts of environmental factors on variation of lignin content can not be ignored.The lignin biosynthetic process has not been elucidated yet,and there are probably several alternative pathways.However,application of antisense transformation of genes of some enzymes such as PAL,C4H,4CL and CCR,can reduce level of lignin content to a certain extent; while transformation of other genes of enzymes like OMT,CAD and F5H has no effect on lignin content but lignin composition.These results remain to be confirmed in the field performance.Based on these progresses,study on multiple transformation of genes of some enzymes is required so as to detect the roles of some enzymes in lignin content and metabolic plasticity.In order to further study genetic variation of lignin content,it is necessary to conduct a study on genetic mapping,location determination and isolation of genes responsible for variation of lignin content,using pedigree materials planted under different environemnts.This may also help us to elucidate the impacts of environmental factors on variation of lignin content at molecular level.