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李秀, 陈曦, 李梦霞, 等. 不同木芙蓉品种的镉胁迫响应[J]. 四川林业科技, 2024, 45(1): 58−65. DOI: 10.12172/202303300001
引用本文: 李秀, 陈曦, 李梦霞, 等. 不同木芙蓉品种的镉胁迫响应[J]. 四川林业科技, 2024, 45(1): 58−65. DOI: 10.12172/202303300001
LI X, CHEN X, LI M X, et al. Response of different Hibiscus mutabilis L. varieties to cadmium stress[J]. Journal of Sichuan Forestry Science and Technology, 2024, 45(1): 58−65. DOI: 10.12172/202303300001
Citation: LI X, CHEN X, LI M X, et al. Response of different Hibiscus mutabilis L. varieties to cadmium stress[J]. Journal of Sichuan Forestry Science and Technology, 2024, 45(1): 58−65. DOI: 10.12172/202303300001

不同木芙蓉品种的镉胁迫响应

Response of different Hibiscus mutabilis L. varieties to cadmium stress

  • 摘要: 为了解不同品种木芙蓉对镉(Cd)胁迫的响应。采用水培试验方法研究了在0,2.5,5,10 mg·L−1 Cd浓度下,四个木芙蓉品种的生长、耐性、叶片色素、Cd含量、Cd积累量及富集转运系数。结果表明:随Cd处理浓度增加,木芙蓉生长表现出低促高抑的毒物兴奋效应,生物量、根长和新枝长在低Cd浓度处理下相对CK增加,而在高Cd浓度下降低;Cd处理下,各品种叶片色素相对CK显著降低,‘百日华彩’的叶片色素含量最高;木芙蓉Cd耐性指数为0.76~1.17,‘百日华彩’对Cd的耐性最高为1.00~1.17;木芙蓉根部Cd含量显著高于地上部,分别为205.01~1089.35 mg·kg−1和27.70~188.92 mg·kg−1,在四个品种中,‘百日华彩’根部Cd含量最高,‘彩霞’地上部Cd含量最高;木芙蓉地上部Cd积累量显著高于根部,分别为0.17~1.01 mg·plant−1和0.04~0.32 mg·plant−1;木芙蓉对Cd的富集系数为56.83~115.59,转运系数为0.08~0.38,‘百日华彩’的Cd富集能力最强,‘彩霞’的Cd转运系数最大。综上,木芙蓉在Cd污染条件下具有较强的耐性和积累能力,其中‘百日华彩’耐性最好,对Cd的富集能力最强,作为Cd修复观赏植物的潜力最大。

     

    Abstract: In order to understand the response of different Hibiscus mutabilis L. varieties to cadmium (Cd) stress, the hydroponic experiments were conducted to investigate the growth, tolerance, leaf pigment, Cadmium (Cd) concentration, Cd accumulation, bioconcentration factor and transfer factor of four different Hibiscus mutabilis L. varieties under different Cd concentrations (0, 2.5, 5, 10 mg·L−1). The results showed that with the increase of Cd concentration, the growth of Hibiscus mutabilis L. showed a toxic hormetic effects. Basically, compared with CK (0 mg·L−1), adding Cd (treatments) increased biomass, root length and new branch length for all Hibiscus mutabilis L. varieties under low Cd concentration, but had opposite effects under high Cd concentration. Under Cd treatment, the leaf pigment concentration of all varieties were significantly lower compared with CK, and the leaf pigment concentration of ‘Bairihuacai’ species was the highest. The Cd tolerance index of Hibiscus mutabilis L. was 0.76-1.17, and ‘Bairihuacai’ species had the highest Cd tolerance index (1.00~1.17). The Cd concentration in the root of Hibiscus mutabilis L. (205.01~1089.35 mg·kg−1) was significantly higher than that in shoot (27.70~188.92 mg·kg−1). The Cd concentration in the root of ‘Bairihuacai’ species was the highest than others, and ‘Caixia’ species had the highest Cd concentration in the aboveground part. Cd accumulation in the aboveground part of Hibiscus mutabilis L. was significantly higher than that in the root, which was 0.17~1.01 mg·plant−1 and 0.04~0.32 mg·plant−1 respectively. The enrichment coefficient of Cd in Hibiscus mutabilis L. was 56.83-115.59, and the transport coefficient was from 0.08 to 0.38. Among which ‘Bairihuacai’ species had the highest Cd enrichment ability, and ‘Caixia’ species had the highest Cd transport coefficient. In conclusion, Hibiscus mutabilis L. has strong tolerance and accumulation ability under Cd pollution condition, among which 'Bairihuacai' species had the best tolerance and the strongest Cd accumulation ability among the four species, and had the greatest potential as an ornamental emediation plants for Cd restoration.

     

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