【摘要】 为明确万寿菊(Tagetes erecta)在种子发芽阶段对盐分、温度及其交互作用的响应,采用5个盐分浓度和3个温度处理分别模拟土壤盐分胁迫条件和气候变暖状况进行研究。结果表明,万寿菊种子能适应低浓度(2g·L-1)的盐分环境,但中高浓度盐胁迫对种子发芽产生明显的抑制作用。在无盐及低盐(2g·L-1)环境下,万寿菊种子能适应较宽的温度范围。盐胁迫与温度交互作用显著(P<0.05)。一方面,盐分浓度会影响温度对万寿菊种子发芽和幼苗生长的作用。在无盐及低盐分浓度下,3个温度组的发芽率无显著差异(P>0.05),但在4~6g·L-1盐分浓度下,高温组万寿菊种子的发芽率和幼苗苗高和根长显著低于另外两个温度组(P<0.05)。另一方面,温度也会影响盐分浓度对万寿菊种子发芽和幼苗生长的作用。在15/25℃与20/30℃变温环境下,只有较高盐分浓度(≥6g·L-1)时种子发芽率才显著降低(P<0.05);而在25/35℃的高温变温环境中,盐分浓度≥4g·L-1时种子发芽率、幼苗苗高和根长就显著下降(P<0.05)。万寿菊种子的发芽指数比发芽率对盐分胁迫的反应更加敏感。更多还原

【Abstract】 The two-factor interaction design was employed to explore the effects of different salt concentrations and temperatures on Tagetes erecta seed germination.The results showed that T.erectaseed germinated well at saltless and low salt concentration(2g·L-1)salinity environment which adapt to a wide temperature range.However,T.erectaseed germination was significantly(P<0.05)inhibited at high salt concentrations.There was significant interaction(P<0.05)between salt stress and temperature.The salt concentration affected the impacts of temperature on the germination and seedling growth.There was no significant difference between the germination of three temperature treatments at saltless and low salt concentration environment.The germination percentages,seedling height and root length of high temperature treatment were significantly lower(P<0.05)than those of the other two temperature treatments when the salt concentration were 4and 6g·L-1.The temperature also affected the impacts of salt concentration on the germination and seedling growth.At 15/25℃and 20/30℃treatments,the germination percentage significantly decreased(P<0.05)when the salt concentration was greater than or equal to 6g·L-1.While at 25/35℃treatment,it was significantly decreased(P<0.05)when the salt concentration was greater than or equal to 4g·L-1.The germination index was more sensitive to salinity stress than the germination percentage.更多还原