Association of esterase isozymes with morphology in F₂ progenies of two growth variants in Poa annua L.

Abstract

SUMMARYThe morphology, flowering behaviour and esterase genotype was examined for six F.^ progenies of hybrids between the two main variants oi Poa annua L. (namely, annual-erect and perennial-prostrate). The association of flowering time with leaf and tiller morphology and Est 1 allozyme genotype, previously described for the two variants in populations from Burgundy, was fully broken in the F.^ generation, indicating that no linkage blocks were involved. Whether selection maintains the association of isozyme genotype and growth form is discussed.

Spontaneous hybridization of the putative ancestors of the allotetraploid Poa annua

“…P. infirma is an erect annual, whereas P. supina is a prostrate perennial species. The tetraploid P. annua exhibits wide morphological variability including annual erect and perennial prostrate ecotypes (Tutin, 1957;Darmency et al, 1992). Sterile triploid plants have been reported in areas where populations of P. annua and P. supina cooccur (Duckert-Henriod & Favarger, 1987).…”

Current understanding of the Poa annua life cycle

“…The two genomes present in allotetraploid species such as P. annua facilitate plant adaptation to a wider range of environments than either diploid parent species (Thompson & Lumaret, 1992). The diploid parents of P. annua have been characterized as an erect annual in P. infirma and a prostrate perennial in P. supina (Darmency, Berti, Gasquez, & Matjicek, 1992). Poa annua encompasses adaptations inherited from both parents (Johnson, 1995).…”

Distinguishing Creeping Bluegrass (Poa annua var. reptans) Genotypes Using Inter-simple Sequence Repeat Markers

“…Others have examined the genetic relatedness of various populations in differing environments through the use of molecular markers. Darmency et al (1992) and Darmency and Gasquez (1997) investigated the inheritance of isozyme patterns, and Cline (2001), Mengistu et al (2000), and Sweeney and Danneberger (1995) used random amplified polymorphic DNA (RAPD) markers to study the relationship of wild P. annua collections. These studies looked at diversity or population relationships of wild P. annua collections within a given environment and different environments on a single golf course; however, no one has studied the genetics of closely related genotypes within a breeding program.…”