CAJ | 학술논문

以红树植物桐花树2a生龄苗为试验材料，采用淡水水培法研究了不同浓度Pb2＋（0mg／L（对照组）、10mg／L、25mg／L、50mg／L、100mg／L、300mg／L、500mg／L）对桐花树叶片的超氧负离子（02。）、丙二醛（MDA）含量、过氧化物酶（POD）与超氧化物歧化酶（SOD）活性、蛋白质以及可溶性总糖量含量的影响．结果表明：随着Pb2＋浓度的升高，桐花树叶片中O2一和MDA含量均呈上升趋势，且均显著高于对照，最高值范围是在Pb2＋浓度100～500mg／L；而蛋白质含量和POD的活性则呈下降趋势，且均显著低于对照．SOD活性在铅胁迫浓度为10mg／L时达到最大，当高于10mg／L时，则随Pb2＋浓度的升高而下降．可溶性糖含量在Pb2＋浓度为0-300mg／L时，随Pb2＋浓度的升高而显著增大．试验表明：桐花树叶片在浓度为10—100mg／L铅处理下，可以通过自身的内在调控抵御铅污染，即轻度的铅污染有利于桐花树的生长；在300—500mg／L高浓度铅胁迫下，各种生理指标出现衰减，显示高浓度铅胁迫的抑制效应，不利于桐花树生长．
이홍수식물동화수2a생령묘위시험재료，채용담수수배법연구료불동농도Pb2＋（0mg／L（대조조）、10mg／L、25mg／L、50mg／L、100mg／L、300mg／L、500mg／L）대동화수협편적초양부리자（02。）、병이철（MDA）함량、과양화물매（POD）여초양화물기화매（SOD）활성、단백질이급가용성총당량함량적영향．결과표명：수착Pb2＋농도적승고，동화수협편중O2일화MDA함량균정상승추세，차균현저고우대조，최고치범위시재Pb2＋농도100～500mg／L；이단백질함량화POD적활성칙정하강추세，차균현저저우대조．SOD활성재연협박농도위10mg／L시체도최대，당고우10mg／L시，칙수Pb2＋농도적승고이하강．가용성당함량재Pb2＋농도위0-300mg／L시，수Pb2＋농도적승고이현저증대．시험표명：동화수협편재농도위10—100mg／L연처리하，가이통과자신적내재조공저어연오염，즉경도적연오염유리우동화수적생장；재300—500mg／L고농도연협박하，각충생리지표출현쇠감，현시고농도연협박적억제효응，불리우동화수생장．
Two - year - old plants of Aegiceras comiculatum cultivated in fresh water were exposed to different con- centrations of Pb2＋（0 mg/L（ CK）, 10mg/L,25 mg/L,50 mg/L, 100 mg/L,300mg/L and 500 mg/L） to investigate the effect of lead exposure on the contents of superoxide radical （ 02 - ）, malonie dialdehyde （ MDA）, peroxidase （POD） and superoxide dismutase （SOD）, protein and soluble sugar. Results indicated that, with the increase of Pb2＋, 02 - and MDA increased to significantly higher than those under control, and reached the highest values un- der Pb2＋100 - 500mg/L; whereas protein content and POD activity declined significantly as Pb2＋ increased. SOD activity reached the highest value at 10 mg/L Pb2＋ , and decreased with raised Pb2＋ concentrations. Soluble sugar content significantly increased with the increase of Pb2＋ within the range of 0 - 300 mg/L. The conclusion is that： exposure of Pb2＋ at 10 - 100mg/L stimulated growth of Aegiceras comiculatum,indicating there existed an intrinsic adaptive mechanism to light lead stress in the plant; but as concentration of lead increased to 300 - 500mg/L, growth of Aegiceras comiculatum was significantly inhibited, with all physiological indexes significantly declined.