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出 处:《植物研究》2009年第3期362-367,共6页Bulletin of Botanical Research
基 金:甘肃省荒漠化防治重点实验室开放基金;国家科技基础条件平台建设专项(2005DKA21403)
摘 要:以珍珠猪毛菜(Salsola passerina Bunge)、地肤(Kochia scoparia(L.)Schrad.)和白藜(Chenopodium album L.)3种藜科植物为研究对象,研究不同浓度(0、50、150、300、600、800、1000mg.L-1)的Pb(Ⅱ)处理对植物种子萌发和幼苗生长的影响。结果表明:当Pb(Ⅱ)浓度为50和150mg.L-1时,珍珠猪毛菜和地肤种子的发芽率、发芽势和发芽指数与对照相比差异不显著,Pb(Ⅱ)浓度为150mg.L-1时,对白藜种子发芽率、发芽势和发芽指数有明显影响,Pb(Ⅱ)浓度大于300mg.L-1对3种植物种子萌发均有抑制作用,对白藜和地肤的抑制大于珍珠猪毛菜。3种植物的种子活力指数除珍珠猪毛菜在50mg.L-1时与对照无显著差异,其余各处理均与对照有极显著差异。Pb(Ⅱ)浓度为50mg.L-1时,对3种植物的胚根长和胚芽长都影响不大,随着Pb(Ⅱ)浓度的升高,对3种植物的胚根长和胚芽长都有明显的抑制作用,对地肤和白藜的抑制强度更大。地肤和白藜幼苗分别在Pb(Ⅱ)浓度为300和600mg.L-1时死亡,当Pb(Ⅱ)浓度达到1000mg.L-1时,珍珠猪毛菜仍可生长,但生长比较缓慢。3种植物幼苗对Pb(Ⅱ)的耐受性为:珍珠猪毛菜>白藜>地肤。The study dealt with the effects of different Pb( Ⅱ ) treatments (0, 50, 150, 300,600, 800, 1 000 mg · L^- 1 ) on seed germination and seedling growth of Salsola passerina Bunge, Kochia scoparia ( L. ) Schrad. and Chenopodium album L. The results showed that: The effects of Pb( Ⅱ ) on the germination percentage,germination energy and germination index of S. passerina Bunge and K. scoparia( L. )Schrad. are not significant (p 〉0.05) when Pb( Ⅱ ) concentrations are 50 and 150 mg · L^- 1 , but it is significant (p 〈0.05) on C. album L. once Pb(Ⅱ ) concentration is up to 150 mg · L^- 1. Although higher Pb(Ⅱ) concentrations ( 〉300 mg · L^- 1) inhibit the germination of the three plants,the effect on K. scoparia ( L. ) Schrad. and C. album L. is stronger. The vigor index of seeds of three plants are significant from control, except for that of S. passerina Bunge at 50 mg · L^- 1 Pb( Ⅱ ). The effects on radicle and plumule elongation are not significant when Pb( Ⅱ ) concentration is 50 mg · L^- 1 As the concentration increasing, the inhibition on the elongation of radicle and plumule of three plants become stronger, but the effect on K. scoparia ( L. ) Schrad. and C. album L. is stronger than S. passerina Bunge. The seedling of K. scoparia( L. )Schrad. and C. album L. died at 300 and 600 mg · L^- 1 Pb( Ⅱ ), respectively. The seedling of S. passerina Bunge still alive even at 1 000 mg · L^- 1, although it grows slowly. The tolerance of seedling growth of three different plants on Pb (Ⅱ ) is S. passerina Bunge 〉 C. album L. 〉 K. scoparia ( L. ) Schrad.
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