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Flower Induction in Glycine Tomentella Hayata following Grafting onto G. Max (L.) Merr.¹

An accession of Glycine tomentella Hayata, subgenus Glycine Willd. (P.I. 393567) from Northern Territory, Australia was induced to flower by grafting it onto a stem of the cultivated soybean G. max (L.) Merr., subgenus Soja (Moench) F. J. Herm. All previous attempts to obtain seed from P.I. 393567 by short photoperiods and ageing had failed. The G. tomentella scion grew vigorously and produced a large number of seed pods under a photoperiod regime conducive to flowering in the soybean. The parent plant from which the scion was obtained did not flower under the same conditions. These results indicated that flowering in the scion probably was induced by a floral stimulus from the soybean stock. Cytological examination showed P.I. 393567 to be tetraploid with 2n=80.

Grafting was demonstrated to be a successful method of promoting seed production in a wild Glycine accession which did not otherwise flower under experimental conditions, thereby enabling conservation of germplasm which could not readily be replaced.

Key Words: Flowering response • Germplasm conservation • Soybean • Subgenus Glycine Willd

² Research associate and professor of plant genetics, Dep. of Agronomy, Univ. of Illinois.

Received for publication May 30, 1978.