【摘要】 用本试验设计改装的控温冰箱对2年生的枳(PoncirustrifoliataRaf.)和宫本/枳砧(CitrusreticulataBlancocv.miyamoto)营养袋盆栽苗进行低温处理,探讨枳和宫本生长期的致死低温.结果表明,棉絮包蔸保持土温的效果与低温处理时间呈极显著正相关,相关系数为r=0.9624.枳和宫本致死低温处理分别为-6℃60min和-6℃40min左右,即该处理导致枳和宫本春叶冻死,电解质渗出率陡然成倍增加,丙二醛含量出现最大值,枳叶片中丙二醛含量比对照增加了14.81%,宫本叶片中丙二醛含量较对照增加17.58%.枳叶片中丙二醛含量从对照到各处理平均是宫本的2.1倍.更多还原

【Abstract】 To research their lethal temperatures during growth season,two-year-old seedlings of Poncirus tri-foliata Raf. (deciduous orange) and Citrus reticulata Blanco cv.Miyamoto(Miyamoto) (rootstock potted in 12 cm×12 cm plastic bags) were treated using improved temperature-controlled refrigerator.Results showed that there was a significant positive correlation of keeping soil temperature and cold-stress time(r=0.9624) with the treatment of wrapping plastic bags with cotton.The lethal temperatures of deciduous orange and Miyamoto were -6 ℃ 60 min and -6 ℃ 40 min,respectively.With these treatments their spring leaves were both lethal and a double amount of electrolyte in leaves was observed.MDA content in deciduous orange and Miyamoto reached their peaks around their lethal temperatures,14.81% and 17.58% more than those in control re-spectively.On average,MDA amount in deciduous orange was 2.1 times higher than that in Miyamoto.更多还原