Lonicera japonica var. aureo-reticulata (yellow-net honeysuckle) was subjected to examine effects of either foliar or soil applied paclobutrazol (PP333) and foliar applied gibberellin (GA₃) at varied concentration levels on the growing responses and extent of the leaf-yellow netting, and the results showed as in the following compendia:
1. PP333 treatment, especially at higher levels, resulted in reduced the number of nodes, and dwarfed the plant height by shortening internodal length, whereas GA₃ as compared to the control markedly increased the height by elongating the internodal length, leaf size, and number of leaves. Soil drenching treatment with PP333 seemed to be more effective in view of horticultural practices for the growth control than the foliar spray.
2. PP333 made the leaves darker green with elevated chlorophyll and carbohydrate contents comparing with the control, and GA₃ reduced chlorophyll, carbohydrate and protein contents. Leaf carotenoid content, however, exhibited practically no difference among the treatments.
3. PP333 had notable dwarfing property for the plant and resulted in producing dark green leaves, whereas GA₃ promoted the stem elongation and reduced chlorophyll content, and thus let the leaves become much strikingly yellow-netted with an attractive appearance.
|