J Integr Plant Biol. ›› 1963, Vol. 11 ›› Issue (1): -.
• Research Articles •
1. The materials used in this experiment are seedlings of winter cabbage (Brassica campestris L.), maize (Zea mays L.) and tomato (Lycopersicum esculentum M.). Some of the winter cabbage seedlings are raised from vernalized seeds, others from unvernalized seeds. Young branches and detached leaves of tomato plant are also tested. The concentrations of gibberellin are 0 (control), 40 and 80 ppm. Radioactive phosphorus (p32) are supplied as KH2PO4 in 485μc per litre. 2. The results of this experiment indicate that the dry weight of shoots of the winter cabbage, maize and tomato are increased by treatment of 40 or 80 ppm gibberelin. The effect of gibberellin on the winter cabbage, maize and tomato last 10, 7 and 11 days respectively. 3. In all cases the absorption of phosphorus is conspicuously promoted by gibberellin. At the same time, the gibberellin treatments have also a stimulation effect on the conversion of organic phosphorus. Both acid-soluble organic phosphorus, and the phosphorus in the phospholipid and protein fraction (nucleoprotein and phosphoprotein) are higher in the treated plants than in the controls. 4. There is a close parallelism between the dry weight increase and the increased phosphorus uptake, suggesting that the effect of dry weight increase is related to the phosphorus metabolism. 5. The sensitivity of the vernalized cabbage toward gibberellin treatment differs from that of the unvernalized. This difference is shown both in the absorption of inorganic phosphorus and its conversion into organic phosphorus. There seems to be some reason to believe that the well known fact that low-temperature requirement of the winter cabbage can be substituted by gibberellin treatment may be related to the promotion of the phosphorus metabolism. It is suggested that the sequence of the effects of gibberellin is as follows: first it promotes the phosphorus metabolism by increasing the growth of plants and then it influences plant development through its effect on growth.
Chao Ke-fu. Effect of Gibberellin on the Phosphorus Metabolism in Plants[J]. J Integr Plant Biol., 1963, 11(1): -.
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