Inheritance of Stylar Morphology and Loss of Self-incompatibility in the Progenies of Induced Autotetraploid Buckwheat

Abstract

This paper deals with agronomic tiraits, chromosomal behavior, loss of incompatibility of stylar variants and inheritance of heterostyly in the progenies of colchicine-induced autotetraploid. Because of a small amount of aneuploids and low frequency of multivalent formation in M1, autotetraploids resulted neither terrible reduction of pollen fertility nor decline of seed set. Grain yield, therefore, increased rather than the original diploid strain and some native varieties. Two types of homostyled variants, namely one reduced style length in pin (PH) and the other increased style length in thrum (TH), were found in the progenies. Of these types, PH plants lost self-incompatibility and, therefore, set selfed seeds. Genetic analysis of heterostyly and incompatibility was attempted in connection with cytological evidences of autotetraploid.