施硅对玉米生长及蒸腾速率的影响

以玉米为试验材料,研究了土培条件下施Si与水分胁迫对玉米生长、蒸腾速率、叶片ABA浓度等的影响。结果表明:无论是否存在水分胁迫,施Si对玉米地上部生物量无显著影响;无论是否施Si,停止供水4d后玉米生物量明显降低;施Si显著降低了玉米植株的蒸腾速率,停止供水后其蒸腾速率明显低于正常水分供应处理,且随胁迫时间的延长,蒸腾速率逐渐降低;无论是否存在水分胁迫,施Si明显增加了玉米叶片的ABA浓度,同时水分胁迫增加了玉米叶片的内源ABA浓度。

Effects of silicon application on growth and transpiration rate of maize

The experiment studied the effect of silicon(Si) on the growth,transpiration rate and leaf abscisic acid(ABA)content in maize(Zea mays L.Nongda 108)in pot soil culture.The results show that Si has no significant effect on shoot dry weight of maize under both water and non-water stress.Water stress significantly reduces shoot dry weight,regardless of Si supply.Compared with non-Si treatment,Si application significantly decreases the transpiration rate of maize plants,regardless of water treatments.Water stress also decreases transpiration rate,gradually with duration of water stress.Si application increases leaf ABA content in maize compared with non-Si treatment,with or without water stress.Water stress also increases leaf ABA content regardless of Si application.