摘要： 试验通过对日光温室黄瓜幼苗不同根区温度的处理,结果表明,与适温处理(ck)相比,亚适温和低温处理的黄瓜幼苗根系中K,Mg的含量增加,而N,P,Ca,Fe,Mn,Cu,Zn的含量降低;茎中N,K,Ca,Mg,Fe的含量增加,而P,Mn,Cu,Zn的含量降低;叶片中K的含量增加,而N,P,Ca,Mg,Fe,Mn,Cu,Zn的含量降低.津春3号较津春2号在维持某些矿质元素含量相对稳定上表现出一些较强的根系耐低温胁迫的能力;根系体积、吸收面积降低,而根系琥珀脱氢酶活性增加.降低根区温度虽然增加了黄瓜幼苗一些元素的含量,但同时也使叶片中除K以外的其他元素含量都降低.降低含量的元素作为限制性因子最终会阻碍地上部的生长发育.

关键词: 根区温度, 黄瓜, 矿质元素, 吸收功能

Abstract: Experiments of root zone temperaturet reatments were carried out at seedling stage of cucumber ( cucumis sativus L. ) in solar greenhouse. Comparison of sub-optimal treatment and low temperature treatment with optimal temperature treatment indicated that contents of K, Mg in root increased, while contents of N, P, Ca, Fe, Mn, Cu, Zn in root decreased; contents of N, K, Ca, Mg, Fe in stem increased, while contents of P, Mn, Cu, Zn in stem decreased; contents of K in leaf increased, while contents of N, P, Ca, Mg, Fe, Mn, Cu, Zn in leaf decreased. Cultivars Jinchun No. 3 showed larger root resistance to low temperature stress in maintaining relative stabilization of some contents of mineral elements than that of cultivars Jinchun No. 2; Volume and absorbent area of root decreased, while succinic dehy drog enase activity of root increased. Low ering root zone temperature increased contents of some elements in seedlings, but contents of elements( do not include K) in leaf decreased. Grow th and development of shoot of cucumber seedlings ult imately were hindered by these decreased elements that maybe were limiting factors.

Key words: Root zone temperature, Cucumber, Mineral element, Absorbent function

中图分类号: 

• S642.2