Wild peas vary in their cross-compatibility with cultivated pea (Pisum sativum subsp. sativum L.) depending on alleles of a nuclear-cytoplasmic incompatibility locus.

Key Message: Divergent wild and endemic peas differ in hybrid sterility in reciprocal crosses with cultivated pea depending on alleles of a nuclear 'speciation gene' involved in nuclear-cytoplasmic compatibility.

Background: In hybrids between cultivated and wild peas, nuclear-cytoplasmic conflict frequently occurs. One of the nuclear genes involved, Scs1, was earlier mapped on Linkage Group III.

Polymorphism in a histone H1 subtype with a short N-terminal domain in three legume species (Fabaceae, Fabaeae).

A number of alleles of an orthologous gene His6 encoding histone H1 subtype f (H1-6 in pea) accumulated in chromatin of old tissues were sequenced in three legume species: seven alleles in Pisum sativum, four in Vicia unijuga and eight in Lathyrus gmelinii. In the total of 19 alleles sequenced in the three species, 29 non-synonymous substitutions and six indels were found in the coding region; most of amino acid substitutions (26 of 29) and all indels occurred in the C-terminal hydrophilic domain of the encoded protein. All species were polymorphic for some non-synonymous substitutions, V.

Inheritance and genetic mapping of two nuclear genes involved in nuclear-cytoplasmic incompatibility in peas (Pisum sativum L.).

Genetic analysis was performed to finely map and assess the mode of inheritance of two unlinked nuclear genes Scs1 and Scs2 involved in incompatibility of the nuclear genome of the cultivated pea Pisum sativum subsp. sativum with the cytoplasm of the wild pea of the subspecies P. sativum subsp.