【摘要】 以水稻汕优63和武运粳7号为材料,在室外遮雨塑料棚下进行培养与处理,研究了1,2,4-三氯苯(TCB)和萘(NAP)对水稻种子萌发、幼苗生长及生理生化的影响。结果表明:①TCB和NAP对水稻种子发芽率几乎无影响,对幼苗株高、根长、根数有显著抑制作用,在水培条件下,较低浓度的TCB(10mg.L-1)、NAP(20mg.L-1)可显著抑制根系的伸长生长,但低浓度的有机污染物促进武运粳7号根数增加;②低浓度的TCB和NAP对水稻幼苗根系活力影响较小,但高浓度的污染物则显著抑制根系活力,影响根的吸收功能;③两有机污染物均导致水稻幼苗叶绿素含量的下降,Rubisco酶活性也明显受到抑制;④叶片中ATP含量随处理浓度增加而呈先降低后升高的变化趋势,而根系中ATP含量则呈先升高后降低的趋势;⑤地上部和根系中丙二醛(MDA)含量均随有机污染物浓度的增加而呈上升的变化趋势。研究结果显示,水中微量的1,2,4-三氯苯和萘均会明显影响水稻幼苗的生长,这对水稻育秧期水质管理具有重要的参考意义,同时,根长可作为确定有机污染物发生事件的植物形态学参考指标。更多还原

【Abstract】 Using rice cultivars of Shanyou 63(indica hybrid) and Wuyujing 7(japonica) as materials,the effects of 1,2,4-trichlorobenzene(TCB)and naphthalene(NAP) on the seed germination,growth and physiology of rice seedlings were studied.The results were as follows: ① TCB and NAP had little effects on the seed germination,but suppressed significantly the plant height,root length and root number.Under solution cultured conditions,lower concentration of TCB(10 mg·L-1)and NAP(20 mg·L-1)suppressed significantly root growth,but increased the root number of Wuyunjing 7;② TCB and NAP had a little effect on root activity at low concentration,but had significant influence at higher concentration;③ TCB and NAP also influenced chlorophyll content and Rubisco activity in leaves of rice seedling;④ ATP content in shoot and root increased firstly and then decreased with increasing concentration both of TCB and NAP;⑤ Malondialdehyde(MDA) content in shoot and root of rice seedling increased strongly proportionally to TCB and NAP concentration.The results suggested that a low content of TCB and NAP would significantly influence the growth of rice seedling,presenting an important suggestion for water quality management during rice seedling period,and root length could act as an inference plant morphologic indicator for organic incident of TCB or NAP.更多还原