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以盐生植物唐古特白刺为试材,研究了不同浓度外源Ca2+(0、5、10、15、20mmol/L)对不同浓度NaCl(100、200、300、400mmol/L)胁迫下唐古特白刺的气孔形态变化的影响。结果表明:唐古特白刺气孔长度和宽度随盐浓度的升高均降低,NaCl浓度为200mmol/L处理下,气孔长度和宽度在Ca2+浓度为10mmol/L时出现最大值,NaCl浓度≥300mmol/L处理下,气孔长度和宽度在Ca2+浓度为15mmol/L时出现最大值。唐古特白刺表皮气孔密度随NaCl浓度升高,逐渐降低;随外源Ca2+浓度升高,气孔密度先增加后降低,NaCl浓度≤300mmol/L时,各盐处理在Ca2+浓度为5mmol/L时气孔密度达到最大值,NaCl浓度为400mmol/L时,虽然气孔密度增大,但是部分气孔发育不成熟,有些变形严重,不能行使其功能,说明唐古特白刺的最大耐盐浓度为300mmol/L。
With the salt plant Tangut as a test material, the effects of different concentrations of Ca2 + (0, 5, 10, 15, 20mmol / L) The influence of the stomatal shape change of. The results showed that the length and width of stomatal aperture decreased with the increase of salt concentration. When the NaCl concentration was 200 mmol / L, the stomatal length and width reached the maximum when the Ca2 + concentration was 10 mmol / L, and the NaCl concentration was 300 mmol / L treatment, the stomatal length and width at the Ca2 + concentration of 15mmol / L maximum occurs. Stomatal density in the surface of stomatal increased gradually with the increase of NaCl concentration. With the increase of exogenous Ca2 + concentration, stomatal density first increased and then decreased. When NaCl concentration was lower than 300mmol / L, Stomatal density reaches the maximum. When the NaCl concentration is 400mmol / L, although the stomatal density increases, some stomatal development is immature, and some deformities are serious and can not perform its function. It shows that the maximum salt tolerance concentration of Nitraria tangutorum is 300mmol / L .