Rajakaruna Nishanta, Siddiqi M Yaeesh, Whitton Jeannette, Bohm Bruce A, Glass Anthony D M
Department of Botany, University of British Columbia, 3529-6270 University Boulevard, Vancouver BC Canada V6T 1Z4.
New Phytol. 2003 Jan;157(1):93-103. doi: 10.1046/j.1469-8137.2003.00648.x.
• Sodium, potassium, calcium, and magnesium ion uptake physiology and tolerance to sodium and magnesium were characterized in two edaphic races (A and C) of two closely related species in the Lasthenia californica complex. • Uptake rates of race A plants were 20-fold higher for Na , and 2-fold higher for Ca and Mg than those of race C plants. Race A translocated c. 50% of absorbed Na to the shoot compared with < 30% in race C. For Ca and Mg corresponding values for the two races were > 95% and ≤ 50%, respectively. • Germination, root growth and survivorship estimates indicated greater tolerance by race A to Na and Mg . Significant genotype treatment interactions were observed, suggesting that these races are genetically differentiated in their tolerance responses. • The study suggests parallel evolution of physiological traits in populations belonging to the two species and points to intriguing correlations between the presence of sulfated flavonoids and the capacities for the uptake of and tolerance to specific ions.
• 对加州小滨菊复合体中两个近缘物种的两个土壤生态型（A和C）的钠、钾、钙和镁离子吸收生理以及对钠和镁的耐受性进行了表征。
• A生态型植株对Na⁺的吸收速率比C生态型植株高20倍，对Ca²⁺和Mg²⁺的吸收速率比C生态型植株高2倍。A生态型将约50%吸收的Na⁺转运到地上部，而C生态型中这一比例小于30%。对于Ca²⁺和Mg²⁺，两个生态型的相应值分别大于95%和≤50%。
• 发芽、根系生长和存活率估计表明A生态型对Na⁺和Mg²⁺具有更高的耐受性。观察到显著的基因型-处理相互作用，表明这些生态型在耐受性反应上存在遗传分化。
• 该研究表明这两个物种的种群中生理性状存在平行进化，并指出硫酸化黄酮类化合物的存在与特定离子的吸收和耐受性能力之间存在有趣的相关性。
