Webster J M
J Nematol. 1995 Sep;27(3):346-52.
Eggs, either dispersed or in masses, and second-stage juveniles (J2) of Meloidogyne incognita were exposed to different concentrations of ammonium ions in a nutrient agar medium upon which excised tomato roots were growing. Egg hatch and J2 penetration of the roots was slowed or inhibited at high (54 and 324 mg/liter) but not at low (1.5 and 9 mg/liter) concentrations of ammonium nitrate. The effect of ammonium on J2 appeared to be temporary and reversible. High potassium nitrate concentration (1,116 mg/liter) did not modify egg hatch or J2 penetration. There was no adverse effect from the high ammonium nitrate concentrations or an equivalent potassium nitrate concentration on root dry weight. Ammonium ions influence nematodes both directly and via plant roots and do so independently of microbial organisms.
将南方根结线虫的卵（无论是分散的还是成块的）和二龄幼虫（J2）置于一种营养琼脂培养基中，该培养基上生长着番茄离体根，并使其接触不同浓度的铵离子。在高浓度（54和324毫克/升）的硝酸铵环境下，卵的孵化和J2对根的侵入会减缓或受到抑制，但在低浓度（1.5和9毫克/升）时则不会。铵对J2的影响似乎是暂时的且可逆的。高浓度的硝酸钾（1116毫克/升）不会改变卵的孵化或J2的侵入。高浓度的硝酸铵或同等浓度的硝酸钾对根干重没有不利影响。铵离子对线虫的影响既有直接作用，也通过植物根系起作用，且这种影响独立于微生物。
