Suaeda maritima is an annual species that grows in salt marshes and tolerates not only salt but also flooding, although plants are smaller at lower than at higher elevations of salt marshes. We investigated whether adventitious roots play a role in tolerance to flooding and how flooding affects ion accumulation in the shoots, a determinant of growth in this species. We examined the response of plants grown in Stout and Arnon culture solution to different periods of flooding at different salinities and verified our results with plants grown in other culture solutions (Hoagland and Yoshida). We measured growth, photosynthesis and estimated stomatal frequency as well as the accumulation of Na⁺, Ca²⁺, Mg²⁺ and K⁺: plants grew and photosynthesised optimally in 200-mM Na⁺ (in Stout and Arnon solution), but the optimal concentration for growth increased to 450 mM when in Yoshida solution. Flooding always decreased growth, but had little effect on Na⁺ concentrations. Although plants produced adventitious roots, their mass decreased rather than increased with flooding. The decrease in production of adventitious roots under flooded conditions suggested that they were not important in the tolerance of this species to submergence—an unusual response compared with the general response of flooding-tolerant plants.

沿海小带藻（Suaeda maritima）是一年生的物种，在盐沼中生长，不仅可以忍受盐分而且还可以忍受洪水，尽管在盐沼海拔较高的地方植物较小。我们调查了不定根是否在水淹耐受中发挥作用，水淹如何影响芽中离子的积累，而芽是该物种生长的决定因素。我们检查了在粗壮和Arnon培养液中生长的植物对不同盐度下不同洪水时期的响应，并用在其他培养液（Hoagland和Yoshida）中生长的植物验证了我们的结果。我们测量了生长，光合作用和估计的气孔频率以及Na ⁺，Ca 2 ⁺，Mg ²⁺和K ⁺的积累：植物在200 mM Na ⁺（在Stout和Arnon溶液中）生长和光合作用最佳，但在吉田溶液中，最佳生长浓度增加到450 mM。洪水总是会降低生长，但对Na ⁺浓度影响很小。尽管植物产生不定根，但其质量随洪水而减少而不是增加。淹水条件下不定根产量的减少表明它们在该物种对淹没的耐受性中并不重要-与耐洪植物的一般反应相比，这是不寻常的反应。