Inducible tolerance to low Ca:Mg in serpentine ecotype of Erythranthe guttata

IF 4 3区 生物学 Q1 PLANT SCIENCES
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Abstract

In serpentine soils, the low level of calcium relative to magnesium (Ca:Mg) is detrimental to the growth of most plant species. Ecotypic variation in Erythranthe guttata allows for some populations to maintain high photosynthetic rates and biomass despite low Ca:Mg. In this study, the mechanism of tolerance was investigated by treating hydroponically grown plants with either high (1.0) or low (0.02) Ca:Mg growth solutions and assaying excised leaf discs for rates of photosynthesis and disc expansion, and for starch, Ca2+ and Mg2+ ion concentrations. Low Ca:Mg in the assay solutions reduced both photosynthesis and leaf disc expansion after one week of treatment. However, serpentine tissues show stable photosynthetic rates after one week and a recovery in leaf tissue expansion after two weeks exposure to low Ca:Mg conditions. Values for non-serpentine tissues continued to decline. Increased growth of low Ca:Mg treated discs supplied with exogenous sucrose suggests that growth in serpentine-exposed tissues is limited by availability of carbon products from photosynthesis. Serpentine leaves had higher vacuole Mg concentrations than non-serpentine leaves after three weeks of treatment with low Ca:Mg. The combination of elevated starch concentrations, reduced growth and lower vacuolar Mg concentrations in leaves of non-serpentine plants grown in low Ca:Mg indicate an inefficient use of carbon resources and starch degradation as an observed response to Mg toxicity. Together, these results suggest that serpentine E. guttata exhibits an inducible tolerance to low Ca:Mg through gradual compartmentalization of magnesium to maintain the production and metabolism of photosynthates necessary for growth.
蛇纹石生态型 Erythranthe guttata 对低 Ca:Mg 的诱导耐受性
在蛇纹石土壤中,相对于镁的低钙含量(钙:镁)不利于大多数植物物种的生长。Erythranthe guttata 的生态型变异使得一些种群在钙镁比低的情况下仍能保持较高的光合速率和生物量。在本研究中,通过用高(1.0)或低(0.02)的 Ca:Mg 生长溶液处理水培植物,并对切除的叶片进行光合作用速率、叶片扩大率以及淀粉、Ca2+ 和 Mg2+ 离子浓度的测定,研究了植物的耐受机制。在处理一周后,化验溶液中 Ca:Mg 含量低会降低光合作用和叶盘膨大率。然而,蛇纹石组织在一周后显示出稳定的光合速率,在低 Ca:Mg 条件下暴露两周后,叶片组织膨大恢复。非蛇纹石组织的数值继续下降。用外源蔗糖处理过的低钙镁叶片生长速度加快,这表明蛇纹石暴露组织的生长受到光合作用碳产物供应的限制。用低 Ca:Mg 处理三周后,蛇纹石叶片的液泡镁浓度高于非蛇纹石叶片。在低钙镁条件下生长的非蛇纹草叶片中,淀粉浓度升高、生长减弱和液泡镁浓度降低,这表明碳资源利用效率低下和淀粉降解是对镁毒性的一种观察反应。总之,这些结果表明,蛇果藻通过镁的逐渐分区,表现出对低 Ca:Mg 的诱导耐受性,以维持生长所需的光合产物的生产和代谢。
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来源期刊
Journal of plant physiology
Journal of plant physiology 生物-植物科学
CiteScore
7.20
自引率
4.70%
发文量
196
审稿时长
32 days
期刊介绍: The Journal of Plant Physiology is a broad-spectrum journal that welcomes high-quality submissions in all major areas of plant physiology, including plant biochemistry, functional biotechnology, computational and synthetic plant biology, growth and development, photosynthesis and respiration, transport and translocation, plant-microbe interactions, biotic and abiotic stress. Studies are welcome at all levels of integration ranging from molecules and cells to organisms and their environments and are expected to use state-of-the-art methodologies. Pure gene expression studies are not within the focus of our journal. To be considered for publication, papers must significantly contribute to the mechanistic understanding of physiological processes, and not be merely descriptive, or confirmatory of previous results. We encourage the submission of papers that explore the physiology of non-model as well as accepted model species and those that bridge basic and applied research. For instance, studies on agricultural plants that show new physiological mechanisms to improve agricultural efficiency are welcome. Studies performed under uncontrolled situations (e.g. field conditions) not providing mechanistic insight will not be considered for publication. The Journal of Plant Physiology publishes several types of articles: Original Research Articles, Reviews, Perspectives Articles, and Short Communications. Reviews and Perspectives will be solicited by the Editors; unsolicited reviews are also welcome but only from authors with a strong track record in the field of the review. Original research papers comprise the majority of published contributions.
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