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近年来,在天津市郊大白菜的结球内部发生一种“干心”病害,从外观看表现正常,当切开后在结球中部叶片的前端呈现褐色干边症状。严重地降低了白菜的品质。该病有逐年发展的趋势。 作者在田间调查的基础上,进一步用溶液培养的方法,在介质中供给不同钙浓度,证明:正常生长的白菜,至少需要80ppm的钙;介质中含20ppm的钙就足以引起“干心”病的发生,病株所表现的症状、病叶部位、发病过程与田间的病株完全吻合,已发病的植株,补增钙后,症状很快消失,并恢复正常生长。因此,白菜“干心”病是由于缺钙引起的一种生理性病害。
In recent years, a “dry heart” disease occurs in the ball of the Chinese cabbage in the suburbs of Tianjin. The appearance of the disease is normal. When the cut is made, the tip of the central leaf of the knot shows a brown dry edge symptom. Seriously reduced the quality of cabbage. The disease has a tendency of development year by year. On the basis of the field investigation, the authors further used solution culture to supply different calcium concentrations in the medium, demonstrating that at least 80 ppm of calcium is needed for normal growth cabbage and that 20 ppm of calcium in the medium is sufficient to cause “dry heart” disease The symptoms of the diseased plants, the diseased parts of the diseased leaves and the pathogenesis are completely consistent with the diseased plants in the field. After the diseased plants have been supplemented with calcium, the symptoms disappear rapidly and the normal growth resumes. Therefore, cabbage “heart” disease is due to calcium deficiency caused by a physiological disease.