4种薄荷种子萌发对干旱与低温的响应

以柠檬薄荷(Mentha citrata)、胡椒薄荷(Mentha piperita)、美国薄荷(Monarda didyma)、猫薄荷(Nepeta racemosa)为供试材料,采用PEG-6000模拟干旱,研究干旱与低温的交互作用对4种薄荷种子萌发及幼苗生长的影响。结果表明,干旱与低温对这4种薄荷种子的萌发及幼苗生长均有显著影响(P<0.05),30%的PEG-6000和8~10 ℃的低温处理严重抑制了这4种薄荷种子的萌发及生长,柠檬薄荷种子发芽表现出较强的抗旱性。4种薄荷种子在22~24 ℃处理下发芽率最高,胚芽、胚根和叶的生长表现出差异性,柠檬薄荷在12~14 ℃时胚根和叶的生长良好。干旱和低温的交互作用对4种薄荷种子的萌发及生长影响显著(P<0.001)。

Effects of drought and low temperature on seed germination of four mint species

In the present study, the effects of drought simulating by PEG-6000 and low temperature on seed germination and seedling growth of four mint species were evaluated. The results showed that drought and low temperature had significant impacts (P<0.05) on the germination and seedling growth of four mint species seeds. The treatments with 30% PEG-6000 and 8~10 ℃ low temperature seriously restrained the seed germination and growth. Mentha citrata seeds showed stronger resistance to drought. The germination percentage of these four mint species seeds were the highest with the 22~24 ℃ treatment. There were differences for the growth of stem, root and leaves. The radicale and leaves of M. citrata grew well under 12~14 ℃. Interaction of drought and low temperature also had significant effect on the germination and growth of four species of mint seeds (P<0.001).