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作者测定了在含盐灌溉水中加 Ca 是否能增强酸橙实生菌对盐水的忍受能力.用不含 NaCl 的营养液、加有NaCl 40mM 的营养液或加 NaCl 40mM 并且加有不同浓度 CaSO_4、CaCl_2或 KCl 的营养液灌溉处理酸橙实生苗4个月.4个月后,只加 NaCl 的处理其植株根和枝梢干重减少约30%而无叶片坏死.在含 NaCl 40mM 营养液中加1mM、5mM 或7.5mM CaSO_4显著抑制了 NaCl 引起的枝梢干重减轻.在含 NaCl 营养液中加7.5mM CaCl_2或7mM KCl 使叶 Na 含量减少,但叶 Cl 含量增加到毒性水平,因而不能改善生长.CaSO_4的有利影响主要在于减少了叶片中 Na 和 Cl 的积累,其含量低于毒害水平(叶 Na 和 Cl 毒害水平分别为0.4%和0.5%),而总溶性盐分含量增加不多。本研究证实加 Ca 的有益效果取决于钙盐分子中与 Ca 离子相结合的阴离子.CaSO_4能克服 NaCl 对酸安生苗的伤害,而 CaCl_2则不能.
The authors determined whether adding Ca in salty irrigation water could enhance the endurance ability of the limestone to brine.The NaCl-free nutrient solution was added with 40mM NaCl or 40mM NaCl plus different concentrations of CaSO4, CaCl2 Or KCl for 4 months. After 4 months, the root and shoot dry weight of plants were reduced by about 30% without leaf necrosis only after 4 months of NaCl treatment. In a NaCl-containing 40 mM nutrient solution, 1 mM , 5mM or 7.5mM CaSO_4 significantly inhibited the shoot dry weight loss induced by NaCl.The addition of 7.5mM CaCl_2 or 7mM KCl to NaCl-containing nutrient solution reduced leaf Na content but increased leaf Cl content to the toxic level and therefore did not improve growth The beneficial effects of CaSO 4 mainly lie in reducing the accumulation of Na and Cl in leaves, which is less than the level of poisoning (the leaf Na and Cl poisoning levels are 0.4% and 0.5%, respectively), while the total soluble salt content increases little. This study demonstrates that the beneficial effect of adding Ca is dependent on the anions associated with Ca ions in the calcium salt molecule.CaSO 4 can overcome the damage caused by NaCl to the sour seedlings while CaCl 2 does not.