What are the symptoms of zinc deficiency in flowers?

The new leaves on the upper part of the plant lose their green color and turn yellow, the internodes of new shoots shorten, small leaves grow densely, and small branches cluster together in tufts; or the upper new leaves turn yellow and become smaller, yellow-brown patches appear between the veins and at the leaf tips, the leaf internodes shorten, the leaves become clustered, and the branches are clustered and small; the old leaves tend to curl outward, the stems and leaves become hard, and flower bud formation is difficult, etc.