Changes in the Growth of Roots and Shoots whenPerilla frutescensL. Britt. is Induced to Flower

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Abstract
The pattern of root and shoot growth of Perilla frutescens L. Britt. was studied in plants growing either in norally inductive photoperiods or in non-inductive photoperiods. By the 20th day of inductive treatment, that is at least 5 d before the first flowers were pollinated, the rate of dry matter accumulation in the roots was slower in induced than in non-induced plants. The roots of induced plants had both a smaller fresh weight and dry weight per unit length. The rate of root elongation also became slower in induced plants than in non-induced plants. The frequency of branching was greater in roots of induced plants. Plants exposed to inductive photoperiods showed precocious development of axillary buds on the shoot, and a reduction in the rate of stem elongation. It is suggested that these changes in the shoot reflect a decrease in the auxin status of the shoot, which may in turn be responsible for the decreased rate of root growth in the induced plants.

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