The materials in this study were arabidopsis thaliana . ( wt ) and its mutants including ethylene over producer mutant ( eto1 - 1 ) , ethylene insensitive root mutant ( eir1 - 1 ) and ethylene insensitive mutant ( etr1 - 3 ) . from the phenotypes of 12 - d - old seedlings of arabidopsis wt and mutants , the root gravitropism was obviously enhanced in etol - 1 , but diminished in eir1 - 1 and etr1 - 3 , compared with wt . the shoot negative gravitropism was also diminished in etiolated seedlings of etr1 - 3 以拟南芥的eth过量产生型突变体( etol - 1 ) ，根对eth不敏感型突变体( eirl - 1 ，地上部对eth响应) ， eth不敏感型突变体( etrl - 3 ，地上部和根均对eth不敏感)及其野生型( wt ， columbia生态型)为实验材料，利用根的向重力性反应为模式，分析了其中eth对auxin效应的调控及其原因。
Because of this , we should put more attention on the treatment - time , if we want to use the half of the lethal salt concentration to judge the capacity of plant fastness to salt . as the salt content increased , the sodium and chloride content of plant increased also . after 36 - day treatment , the plants grew under 50 ~ 100 mmol . l - 1 salt levels had the most amount of salt ions Nacl环境下，植株体内盐分离子na ~ + 、 cl ~ -含量均随着盐分水平的升高而升高；但随着处理时间的延长，根部na ~ + 、 cl ~ -含量表现为不断地显著增长，而地上部则表现为先增长后下降的趋势；经过36天的盐分处理，地上部盐分离子的最大无差异单株积累量分布在50 100mmol ? l ~ ( - 1 )左右的盐分环境下。
In contrast , plants from three populations of e . splendens showed high cu tolerance and substantial cu accumulation , under 100 umol l - 1 the plant of tl / zj / jd can accumulate 143 . 5 , 71 . 9 and 58 . 1 mg kg - 1 cu in the aboveground parts , respectively . the cu concentration in shoots was 16 to 27 times more than cu concentration in roots 在盆栽试验条件下，海州香薷和紫花香薷对土壤铜、锌、铅复合污染都具有很强的耐性，地上部分铜、锌、铅等重金属含量在植物生长期呈现动态变化，但植物地上部重金属积累量保持增加趋势。
The colonization of gintraradices , gcaledordinum and gmosseae can decrease the uptake and accumulation of heavy metals of festuca . rubra and red clover and then protect them from toxicity of heavy metals to some extent . . there were consistent difference amongthe effect of different amf species , gintraradices had better effect on the decrease of heavy metal content in shoot of host plants than gcaledordinum and gmosseae 能明显降低紫羊茅、三叶草体内重金属山根系向地上部的运输，在某种程度上减少了高浓度重金属对植株的影响，有利于紫羊茅和三叶草在重金属污染土壤中定植。不同菌种的菌根效应有较大差异，菌种gintraradice :在减少重金属由根系向地上部运输的作用上优于菌种gcaledordinum和gm口sseae 。
Wheat was the dominating crop in aspects of both the growth and mn nutrients competition either in wheat - rape or in wheat - chickpea intercropping system , but the growths of rape and chickpea were suppressed by wheat . root barriers did not affect the total shoot dry weight in wheat - oat system , but the total mn uptake was lower in no barrier treatment ( mixed cropping ) than in solid barrier treatment ( mono cropping ) 在本试验条件下，小麦与油菜或鹰嘴豆混作能显著改善小麦的生长及锰营养，其地上部干重及吸锰量均以根系不分隔处理显著高于根系完全分隔处理；油菜和鹰嘴豆的生长受小麦抑制，均表现为不分隔处理的地上部干重及吸锰量显著低于完全分隔。
The result showed that physiological response were mainly affected by concentration of peg and less affected by time of peg ( 6000 ) treatment . relative water content of leaves root activity , and growth of roots and plants showed a less reduction under 10 - 20 % peg ( 6000 ) treatment , but ratios of root cap , and contains of soluble sugar , contain of pro and potassium showed a less increase . all those just described indexes showed a marked change under 25 % peg treatment 在10 20的peg浓度胁迫下，叶片相对含水量、根系活力、根系及地上部生长量下降的幅度较小；根冠比、可溶性糖、脯氨酸( pro ) 、 k ~ +上升的幅度也较小，而在25的peg浓度胁迫下上述指标发生了很显著的变化，叶片相对含水量、根系活力明显下降，可溶性糖最大含量出现的时间较20浓度胁迫的提早3d ，且较20时的最大含量小，并在延长处理3d后又开始下降，根系和地上部的生长受到严重抑制，且地上部影响大于根系，根冠比显著增大，胁迫后期趋于恒定状态，生长几乎完全停止。
