第一个试验于5月下旬,将15株枳砧1年生兴津早生温州蜜柑种植在坑里,并正常浇灌Hoagland和Synelor溶液。在7月中旬,每个坑的表面整整地盖上打洞的塑料盖子,每坑从7月14日到8月12日连续不断地供给20升含有乙烯0—50ppm的空气。在8月中旬进行检查,结果发现:当乙烯为5ppm和5ppm以上时梢的伸长根的生长及琥珀酸脱氨酶的活动几乎被抑制;这样的浓度也会引起根尖肿大和根变褐色。当乙烯为0—0.05ppm时,许多根毛是园锥形的,乳头状的及梨形的;而且随着乙烯浓度的增加 In the first experiment, 15 Citrus aurantiaca (Citrus reticulata) early-growing Satsuma mandarin oranges were planted in pits in late May and Hoagland and Synelor solutions were applied to normal conditions. In mid-July, the surface of each pit was completely covered with a perforated plastic lid, each pit continuing to supply 20 liters of air containing 0-50 ppm of ethylene from July 14 to August 12. Examination in mid-August revealed that the growth of the elongated root tip and the activity of the succinate deaminase were almost inhibited when the ethylene content was 5 ppm and above 5 ppm; such concentrations also caused the root tip to swell and the root to turn brown . When the ethylene is 0-0.05 ppm, many root hairs are conical, papillary, and pear-shaped; and as the ethylene concentration increases