Millet and tobacco were transformed with the thrt ' e plant expression vectors . our observations with transgenic plants showed that the pf40 gene affected the growth of lateral shoots developing in the basipetal pattern early after floral transition . analysisd the transgenic plants showed the pf40 gene can reduced the apical dominance of both millet and tobacco 测量结果表明pf40基因过量表达的转基因谷子生长素的含量降低为对照的0 . 6 0 . 8倍，而细胞分裂素的含量较对照约升高0 . 2 0 . 35倍，生长素与细胞分裂素的比值在转基因植物中改变明显，降低到对照的一半。
Because the use of the soil is usually very intensified , a huge sum of input of urban fertilizers such as composted urban waste , garbage and sewage etc would increase the soil fertility , which made an enrichment of certain materials such as organic matter , n , p etc in urban areas 由于城市土壤利用强度高，被投入的大量城市肥料显著地提高了土壤肥力，使得某些物质(有机质、氮、磷等)在城市土壤中富集；但是由于过度利用以及施肥不当，也使得一些土壤物质的含量降低。
It is well known that estrogen is essential for healthy bone , and that when the production of estrogen is reduced , as occurs normally in postmenopausal women and pathogenically after exposure to radiation or chemotherapeutic drugs , bones become brittle and break easily 众所周知，雌激素对于健康的骨骼是必需的，当体内雌激素的含量降低的时候，就像正常的绝经后妇女那样，有时候在一些病理状态下如接受放疗或服用化疗药物也会出现，这时候骨骼就会变脆而且非常容易骨折。
This paper focused on two aspects : the physiological effects of cold stress on the euonymus japonicus " zhuzi " ; the isolation of cold - induced cdna gene . the results obtained were as follows : first , the chlorophyll ( chi ) and carotenoid ( car ) contents in euonymus japonicus " zhuzi " seedlings decreased greatly as the cold stress proceeded , accompanied by the sharply increasing contents of mda and pmp . it shows that chi and car degradation under cold stress was correlated with the damage of the plasma membrane 主要研究结果如下： ( 1 ) ‘粗枝’大叶黄杨在低温胁迫下，随胁迫时间的延长，叶片中脂质过氧化物的终产物( mda )含量明显增加，细胞质膜相对透性( pmp )明显增大；叶绿素( chl ) 、类胡萝卜素( car )含量降低，且其含量的降低与mda含量增加及pmp升高间呈显著负相关，说明低温胁迫下‘粗枝’大叶黄杨幼苗chl和car的降低与生物膜的损伤有关。
