水杨酸浸种对高羊茅在干旱胁迫下萌发的影响

用不同浓度水杨酸溶液浸泡处理冷季型草坪草高羊茅（Festuca arundinacea）的种子，在PEG 2000模拟干旱胁迫条件下，采用纸上发芽法（TP）研究了水杨酸浸种对盆景2000、猎狗5号、红宝石3个高羊茅品种萌发的影响。结果表明，在干旱条件下，适宜低浓度水杨酸溶液0.12~1.00 mmol/L浸种可以提高高羊茅种子的发芽势、发芽率，促进种子胚芽和胚根的生长，提高高羊茅种子萌发期的抗旱性；而高浓度水杨酸浸种抑制了种子的萌发和生长，3.00 mmol/L达到显著抑制水平（P＜0.05）。其中，能显著增强高羊茅种子萌发阶段抗旱性的水杨酸最适浓度为0.50 mmol/L。

Effects of soaking seeds with salicylic acid on tall fescue seed germination under drought stress

Tall fescue(Fescue arundinacea) is a cold-season type turfgrass and is widely used in urban greening.This study was to evaluate effects of socking seeds with different concentrations of salicylic acid(SA) on seed germination of Bonsai 2000,Houndog 5 and Ruby tall fescue under drought stress,which was simulated by PEG-2000.The results obtained from the study indicated that SA at the lower concentration(0.12-1.00 mmol/L) increased germination potential,germination rate of tall fescue seeds;promoted growth of seedlings and roots;and improved the drought resistance of tall fescue during seed germination period.However,the higher concentrations(2.00-3.00 mmol/L) inhibited seed germination and growth of the seedlings.The treatment with 3.00 mmol/L SA displayed a significant inhibiting effect(P<0.05) on tall fescue seed germination.The treatment with 0.5 mmol/L SA showed the best performance in this study.