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KMID : 0903619750160010026
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Journal of the Korean Society for Horticultural Science
1975 Volume.16 No. 1 p.26 ~ p.35
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Effects of Reserve Materials and Basal Leaves on the Early Stage of Growth in Campbell Early Grapevine (Vitis Labruscana B.)
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Abstract
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The importance of reserve materials and basal leaves on the early stage of growth in Campbell Early grapevine (Vitis labruscana B.) was studied through observation of the altered nutrient levels in plant by leaf removal, growth condition in the field and the physiological chracteristics of leaf.
Up to the final leaf size, an increase of net photosynthetic activity per unit area was proportional to that of leaf area and chlorophyll content, thereafter being largely controlled by leaf age.
Total carbohydrate contents of the defoliated shoots began to decline drastically from 3 weeks before bloom as compared with the control, and this variation was almost the same with the seasonal changes of shoot growth.
In comparison of the cluster weight between the defoliated and the control, the former, showing 100% drop in 2 weeks after bloom, weighed much less than the latter before or after bloom because of heavy drop.
These results indicated that reserve materials alone was not enough for successful plant growth when 4-5 leaves expanded of 3 weeks before flowering and that assimilates produced in the basal leaves had the most important role on the early stage of plant growth.
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