Gynodioecy in plantago lanceolata L. II Inheritance of three male sterility types

Abstract

SUMMARYInheritance of male sterility has been studied in Plantago lanceolata. Crosses between plants, obtained from a 50 m2 area, yielded the entire array of possible sex phenotypes. Emphasis is put on nuclear inheritance of two nuclear-cytoplasmically determined male sterility types. In both types multiple interacting genes are involved. For MS1 a combination of two recessive and three dominant male sterility genes is proposed, for M52 three recessives. These are minimum estimates as the exact numbers could not be determined. One of the loci for MS2 is probably linked to the self-incompatibility locus. Not all results can be explained this way, which emphasizes the complexity of nuclear inheritance. Intermediates between the completely male steriles of both types and hermaphrodites constitute two continuous series, each consisting of multiple genotypes with overlapping phenotypes. Segregation patterns indicate genetic determination by incomplete dominance at the male sterility loci. A third male sterility type (MS3) is described whose expression appears to be independent of plasmon type. Preliminary results indicate two duplicate recessive male sterility genes.The stability of the complexity of nuclear inheritance for gynodioecy is discussed.

Parental effects in Plantago lanceolata L. II. Manipulation of grandparental temperature and parental flowering time

“…Van Damme (1983) suggested that male sterility is plastic in P lanceolata, and our results demonstrate this for some families. Low temperature enhances femaleness in many diclinous species (Chailakhyan & Khrianin, 1987).…”

“…The flowering season in North Carolina extends from May through August. The species is protogynous, gynodioecious, and self-incompatible (Ross, 1973;van Damme, 1983).…”

A genetic analysis of reproductive barriers in Phacelia dubia

“…This apparent contradiction may not be so surprising when one considers that there exists a genetically based physiological basis for pollen, and not ovule, sterility. Studies of numerous plant species have shown that pollen sterility often results from nuclear-cytoplasmic interactions (Kheyr-Pour, 1980;Van Damme, 1983;Kesseli & fain, 1984;Boutin a al., 1987). In several species a strong correlation of mitochondrial genotype with male sterility has implicated the plant mitoehondrial genome as a controlling factor in pollen development (Warmke & Lee, 1977;Pring & Levings, 1978;Forde & Leaver, 1980;Powling, 1981;Dixon & Leaver, 1982;Leaver & Gray, 1982).…”

The maintenance of females among hermaphrodites: the importance of nuclear-cytoplasmic interactions

“…The two best known examples of putative nuclear inheritance of male sterility, in Origanum vulgare L. (Lewis and Crowe, 1956) and in Plantago lanceolata L. (Ross, 1969) have now been shown to be nuclear-cytoplasmic (Kheyr Pour, 1980;van Damme, 1983). The original studies and conclusions were based on a very small number of plants: five plants for 0. vulgare (Lewis and Crowe, 1956) and four plants for P. lanceolata (Ross, 1969).…”