CAJ | 학술논문

通过香根草的水溶液培养,研究了不同浓度的镉(Cd)对香根草的生理和生态的影响.结果表明:香根草富集的Cd主要被累积在根内,最高富集系数达到24.06%.溶液Cd浓度与香根草根内Cd的累积量显著正相关(r=0.987 4),与根的耐性指数呈显著负相关(r=-0.943 6).低浓度Cd(≤1 mmol·L~(-1))处理使根系活力和硝酸还原酶(NR)活力随时间呈现先升后降的趋势,中、高浓度Cd (≥1.5 mmol·L~(-1))处理使根系活力呈显著下降的趋势,且浓度越高,下降幅度越大.化学形态分析表明,在香根草体内Cd的NaCl提取态占绝对优势,在根和茎叶内的平均占52.06%和64.03%.可以认为香根草在Cd胁迫下其氮代谢、呼吸作用,植物的生长发育受到一定程度抑制,但其对Cd仍具有较强的耐性和富集能力.
통과향근초적수용액배양,연구료불동농도적력(Cd)대향근초적생리화생태적영향.결과표명:향근초부집적Cd주요피루적재근내,최고부집계수체도24.06%.용액Cd농도여향근초근내Cd적루적량현저정상관(r=0.987 4),여근적내성지수정현저부상관(r=-0.943 6).저농도Cd(≤1 mmol·L~(-1))처리사근계활력화초산환원매(NR)활력수시간정현선승후강적추세,중、고농도Cd (≥1.5 mmol·L~(-1))처리사근계활력정현저하강적추세,차농도월고,하강폭도월대.화학형태분석표명,재향근초체내Cd적NaCl제취태점절대우세,재근화경협내적평균점52.06%화64.03%.가이인위향근초재Cd협박하기담대사、호흡작용,식물적생장발육수도일정정도억제,단기대Cd잉구유교강적내성화부집능력.
The physiological and ecological effects on Vetiveria zizanioides(V.zizanioides)grown in hydroponic culture under the stresses at different concentration of Cadmium(Cd)were studied. The experiment results showed that Cd mainly cumulated in the root. The highest Bioconentration factor (BF) was 34%. of Cd with a positive correlation with Cd cumulation in the root (r=0.987 4), while the concentration had a negative correlation with a tolerance index of the root (r=-0.943 6). The root activity and nitrate reductase(NR)activity revealed an increase and then a decrease trend in low concentration treatment of Cd (≤1 mmol/L)with time; the root activity and nitrate reductase activity revealed an obvious descending trend in the middle and high concentration treatment of Cd (≥1.5 mmol/L), and the descending extent increased with the increase of the concentration of Cd. Sequential extraction revealed that NaCl extractable-Cd was dominant in both the roots and the leaves of V.zizanioides. The average proportion was 52.06 and 64.03. V.zizanioides nitrogen metabolism, respiration and growth development were inhibited by Cd stress, but it still had a strong tolerance level and accumulation ability.