ISHS Acta Horticulturae 629: XXVI International Horticultural Congress: The Future for Medicinal and Aromatic Plants
TRANSPORTATION AND DISTRIBUTION OF CARBON AND NITROGEN NUTRITION IN GINGER |
| Authors: | K. Xu, Y.Y. Guo, X.F. Wang |
| Keywords: | Fertilization, CO2 assimilation, Isotopic trace, Growth period, Seed-ginger, Zinigiber officinale |
| Abstract:
The characteristics of transportation and distribution of 14C and 15N in ginger were investigated. Results showed that shoots and leaves were growth centers at the seedling stage, and 80.7 % of the carbon assimilation was transferred to these parts. Afterward, the distribution rate for shoots and leaves decreased gradually with the growth, whereas the distribution rate for the rhizome increased. Up to the vigorous growth stage of rhizome carbon assimilation was mainly transported from leaves into the rhizome, thus the rhizome became growth center. The absorption and utilization of nitrogen were the same as carbon assimilates. 48.41 % of the nitrogen absorbed from fertilizer applied at seedling stage was distributed to the shoots and leaves. While 65.43 % of the nitrogen derived from fertilizer applied at vigorous growth of rhizome was distributed into rhizomes, only 32.04 % distributed into shoots and leaves. The rate of fertilizer-N utilization by ginger was quite different in different fertilizer-N application stages. The results indicated that the rate of fertilizer-N utilization increased with the delay of application. The highest utilization rate, 45.24 % was observed when fertilizer was applied during the middle period of vigorous growth, while the utilization rate was only 28.09 % when applied at seedling stage. The results also showed that the stored nutrients in the ginger seed were partly transferred to new plants in the whole process of growth. A certain proportion remained in the ginger seed itself. At the same time, a part of the carbon and nitrogen nutrition assimilated by the leaves and roots was transported back to seed-ginger. The exchange of carbon and nitrogen nutrition between the above ground parts and underground seed of ginger would be the characteristics of their transportation and distribution during ginger growth. This ensured that the seed-ginger could not be shriveled. | |
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