The Pattern of Reproductive Development inChenopodium rubrumL.

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Abstract
Individual plants of Chenopodium rubrum were given different numbers of inductive cycles in a 12 h photoperiod and the pattern of reproductive development was analysed after 40 d of growth. At least 2 inductive cycles are required to form any determinate reproductive organs and at least 12 cycles are required for normal reproductive development. Individuals given a single inductive cycle display a loss of apical dominance at those nodes formed immediately after the treatment without the subsequent formation of any floral structures. Plants given between 2 and 12 mductive cycles display both determinate reproductive organs and indeter minate vegetative shoots. The pattern of reproductive development on such plants depends upon the number of cycles relative to the developmental age of newly initiated primordia. It is suggested that the early events of floral induction may involve a radical decrease in the ratio of auxin to cytokinin.