Theoretical and Applied Genetics

, Volume 114, Issue 2, pp 307–319

High levels of linkage disequilibrium and associations with forage quality at a Phenylalanine Ammonia-Lyase locus in European maize (Zea mays L.) inbreds

Authors

  • Jeppe R. Andersen
    • Danish Institute of Agricultural Sciences, Research Center Flakkebjerg
  • Imad Zein
    • Department of Agronomy and Plant BreedingTechnical University of Munich
  • Gerhard Wenzel
    • Department of Agronomy and Plant BreedingTechnical University of Munich
  • Birte Krützfeldt
    • Bavarian State Research Center for Agriculture
  • Joachim Eder
    • Bavarian State Research Center for Agriculture
  • Milena Ouzunova
    • KWS Saat AG
    • Danish Institute of Agricultural Sciences, Research Center Flakkebjerg
Original Paper

DOI: 10.1007/s00122-006-0434-8

Cite this article as:
Andersen, J.R., Zein, I., Wenzel, G. et al. Theor Appl Genet (2007) 114: 307. doi:10.1007/s00122-006-0434-8

Abstract

Forage quality of maize is influenced by both the content and structure of lignin in the cell wall. Phenylalanine Ammonia-Lyase (PAL) catalyzes the first step in lignin biosynthesis in plants; the deamination of l-phenylalanine to cinnamic acid. Successive enzymatic steps lead to the formation of three monolignols, constituting the complex structure of lignin. We have cloned and sequenced a PAL genomic sequence from 32 maize inbred lines currently employed in forage maize breeding programs in Europe. Low nucleotide diversity and excessive linkage disequilibrium (LD) was identified at this PAL locus, possibly reflecting selective constrains resulting from PAL being the first enzyme in the monolignol, and other, pathways. While the association analysis was affected by extended LD and population structure, several individual polymorphisms were associated with neutral detergent fiber (not considering population structure) and a single polymorphism was associated with in vitro digestibility of organic matter (considering population structure).

Abbreviations

IVDOM

In vitro digestibility of organic matter

WSC

Water soluble carbohydrates

NDF

Neutral detergent fiber

DNDF

Digestibility of neutral detergent fiber

Indel

Insertion–deletion polymorphism

LD

Linkage disequilibrium

PAL

Phenylalanine Ammonia-Lyase

SNP

Single nucleotide polymorphism

Copyright information

© Springer-Verlag 2006