Development of AFLP and RAPD markers linked to a locus associated with twisted growth in corkscrew willow (Salix matsudana 'Tortuosa')

Juan Lin, Lee E. Gunter, Scott A. Harding, Richard F. Kopp, Rachel P. McCord, Chung Jui Tsai, Gerald A. Tuskan, Lawrence B. Smart

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Salix matsudana Koidz. cultivar 'Tortuosa' (corkscrew willow) is characterized by extensive stem bending and curling of leaves. To investigate the genetic basis of this trait, controlled crosses were made between a corkscrew female (S. matsudana 'Tortuosa') and a straight-stemmed, wild-type male (Salix alba L. Clone 99010). Seventy-seven seedlings from this family (ID 99270) were grown in the field for phenotypic observation. Among the progeny, 39 had straight stems and leaves and 38 had bent stems and curled leaves, suggesting that a dominant allele at a single locus controls this phenotype. As a first step in characterizing the locus, we searched for amplified fragment length polymorphism (AFLP) and randomly amplified polymorphic DNA (RAPD) markers linked to the tortuosa allele using bulked segregant analysis. Samples of DNA from 10 corkscrew individuals were combined to produce a corkscrew pool, and DNA from 10 straight progeny was combined to make a wild-type pool. Sixty-four AFLP primer combinations and 640 RAPD primers were screened to identify marker bands amplified from the corkscrew parent and progeny pool, but not from the wild-type parent or progeny pool. An AFLP marker and a RAPD marker linked to and flanking the tortuosa locus were placed on a preliminary linkage map constructed based on segregation among the 77 progeny. Sectioning and analysis of shoot tips revealed that the corkscrew phenotype is associated with vascular cell collapse, smaller cell size in regions near the cambium and less developed phloem fibers than in wild-type progeny. Identification of a gene associated with this trait could lead to greater understanding of the control of normal stem development in woody plants.

Original languageEnglish (US)
Pages (from-to)1575-1583
Number of pages9
JournalTree Physiology
Volume27
Issue number11
DOIs
Publication statusPublished - Nov 2007

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Keywords

  • Bulked segregant analysis
  • Mapping
  • Molecular markers
  • Salix alba
  • Stem development
  • Wood formation

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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