Feist Laura J, Parker David R
Soil and Water Sciences Section, Department of Environmental Sciences, University of California, Riverside, Riverside California, 92521, USA.
New Phytol. 2001 Jan;149(1):61-69. doi: 10.1046/j.1469-8137.2001.00004.x.
• Ecotypic variation in selenium (Se) hyperaccumulation in plants is reported here among populations of Stanleya pinnata (Brassicaceae), which has a broad biogeographical range in the western USA. • In a glasshouse study, Se and sulfur accumulation were examined in 16 populations of S. pinnata. Plants grown from seed (collected from sites representing the species range) were subjected to five treatments differing in selenate (SeO ) and sulfate (SO ) concentrations. • The populations differed in shoot Se concentration by 1.4- to 3.6-fold, depending on the treatment, and these concentrations were positively correlated with the indigenous soil Se levels at the collection sites. Shoot S concentrations varied by less than two-fold, and did not correlate with the shoot Se levels. All populations accumulated SeO preferentially over SO . By contrast, Brassica juncea seedlings grown in a similar solution series consistently accumulated SO preferentially over SeO . Biomass production differed up to three-fold between populations. • S. pinnata is a primary Se accumulator, but populations exhibit significant ecotypic differences in Se accumulation. Environmental concerns about Se are common, and the broad adaptation of S. pinnata makes it an attractive candidate for phytoremediation.
• 本文报道了在美国西部具有广泛生物地理分布的羽叶碱蓬（十字花科）种群中，植物对硒（Se）超积累的生态型变异。
• 在温室研究中，对16个羽叶碱蓬种群的硒和硫积累情况进行了检测。用从代表该物种分布范围的地点收集的种子培育的植株，接受了五种不同硒酸盐（SeO ）和硫酸盐（SO ）浓度的处理。
• 根据处理方式不同，各羽叶碱蓬种群地上部硒浓度相差1.4至3.6倍，且这些浓度与采集地的原生土壤硒水平呈正相关。地上部硫浓度变化不到两倍，且与地上部硒水平无相关性。所有种群优先积累硒酸盐而非硫酸盐。相比之下，在类似溶液系列中生长的芥菜幼苗则始终优先积累硫酸盐而非硒酸盐。不同种群间生物量产量相差达三倍。
• 羽叶碱蓬是主要的硒积累植物，但不同种群在硒积累方面表现出显著的生态型差异。对硒的环境问题普遍存在担忧，而羽叶碱蓬的广泛适应性使其成为植物修复的一个有吸引力的候选物种。
