Ecological Study of Rosette Formation of Eustoma Grandiflorum

高温诱导洋桔梗幼苗形成莲座丛。季节有额外的（未知的）影响，特别是在中等温度下生长的植物。在30 ^摄氏度和35 ^摄氏度下，抽薹减少，但在25 ^摄氏度下不减少。将发芽的幼苗暴露于高温下短至7天减少，并且超过2周完全抑制随后在低温下生长的植物的抽薹。总之，重要的是从播种时起将幼苗保持在平均温度约为25 ℃且最低温度低于20 ℃的条件下，直到真叶数超过4，以防止莲座丛诱导。特别是播种后的两周是至关重要的;因此，在此期间的温度控制是最重要的。

Rosette formation of young seedlings of Eustoma grandiflorum was induced by high temperature. Season had an additional (unknown) effect, especially on plants grown in intermediate temperatures.Bolting was reduced at 30 ^ﾟC and 35 ^ﾟC but not at 25 ^ﾟC.Exposing germinating seedlings to high temperatures for as little as 7 days reduced, and for more than 2 weeks completely inhibited bolting in plants subsequently grown at low temperatures.In conclusion, it is important to keep the seedlings under a condition with an average temperature at about 25 ^ﾟC and the minimum temperature lower than 20 ^ﾟC from the time of sowing until number of true leaves exceeds four to prevent the rosette induction. Especially, two weeks from the sowing is critical ; therefore, the temperature control during the period is most important.