Nickelophilic root foraging by the nickel hyperaccumulator, Streptanthus polygaloides subsp. undulatus (Brassicaceae)

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY
Katherine A. Mincey, Robert S. Boyd
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引用次数: 0

Abstract

Root foraging may allow hyperaccumulator plants to enhance element accumulation. This study compared root proliferation of two annual serpentine endemics: Streptanthus polygaloides (Ni hyperaccumulator) and Streptanthus insignis (nonhyperaccumulator). In a greenhouse experiment, pots were divided by a sealed partition, Ni-amended soil (800 mg kg −1) in one half, unamended soil in the other. Seeds were germinated over the partition, allowing roots to explore both soils. After 5 months, roots from each side of each pot were harvested, washed, dried, and weighed. Streptanthus polygaloides root biomass was significantly (twofold) greater in Ni-amended soil whereas S. insignis root biomass was similar in the two soils. In a lab experiment, seedlings were grown in vertical agar-filled petri dishes to determine if Ni affected seedling root growth. Seedlings were placed on either side of a central filter paper strip soaked in either NiCl2 solution or deionized water. Growth direction of the primary root (toward, away, neutral) and lateral root numbers and lengths were recorded. For seedlings, primary root direction and lateral root numbers/lengths were significantly increased toward Ni-soaked filter paper only for S. polygaloides. We conclude that S. polygaloides exhibited positive root foraging responses. These may enhance Ni uptake and we suggest the term “nickelophilic root foraging” be applied to this behavior.

Abstract Image

镍高积累植物 Streptanthus polygaloides subsp. undulatus(十字花科)的嗜镍根觅食行为
根系觅食可能会使超积累植物加强元素积累。本研究比较了两种一年生蛇纹石特有植物的根增殖情况:Streptanthus polygaloides(镍高积累植物)和 Streptanthus insignis(非高积累植物)。在温室实验中,花盆被密封隔板隔开,一半是掺镍土壤(800 毫克/千克-1),另一半是未掺镍土壤。种子在隔板上发芽,让根系探索两种土壤。5 个月后,收获每盆每侧的根系,洗净、晾干并称重。在添加了氮的土壤中,Streptanthus polygaloides 的根部生物量明显增加(两倍),而在两种土壤中,S. insignis 的根部生物量相似。在实验室实验中,幼苗生长在垂直的琼脂培养皿中,以确定镍是否会影响幼苗根系的生长。幼苗被放置在中央滤纸条的两侧,滤纸条浸泡在氯化镍溶液或去离子水中。记录主根的生长方向(朝向、远离、中性)以及侧根的数量和长度。对于幼苗而言,只有多galoides的主根方向和侧根数量/长度向浸过镍的滤纸方向显著增加。我们得出的结论是,远志蛙表现出了积极的根觅食反应。这些反应可能会促进镍的吸收,我们建议将 "嗜镍根觅食 "一词用于这种行为。
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来源期刊
Ecological Research
Ecological Research 环境科学-生态学
CiteScore
4.40
自引率
5.00%
发文量
87
审稿时长
5.6 months
期刊介绍: Ecological Research has been published in English by the Ecological Society of Japan since 1986. Ecological Research publishes original papers on all aspects of ecology, in both aquatic and terrestrial ecosystems.
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