Under the low pH condition with NH~+_4N as the sole N source, aerenchyma could be formed much easier in the root cortex of rice. This might be an adaptable mechanism of plant to decrease toxicity of ammonium accumulation under low pH condition.

• 低pH条件下且以NH4+-N为单一N源时,稻根皮层处更易形成通气组织,可能是植物为了减轻低pH条件下铵毒害而产生的一种适应性机制。