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Asr genes belong to a gene family comprising at least three closely linked loci on chromosome 4 in tomato


Asr1, Asr2 andAsr3 are three homologous clones isolated from tomato whose expression is believed to be regulated by abscisic acid (ABA); the corresponding genes thus participate in physiological and developmental processes such as responses of leaf and root to water stress, and fruit ripening. In this report, results obtained with Near Isogenic Lines reveal thatAsr1, Asr2 andAsr3 represent three different loci. In addition, we map these genes on the restriction fragment length polymorphism (RFLP) map of the tomato genome by using an F2 population derived from an interspecific hybrid crossL. esculentum × L. penelli. RFLP data allow us to map these genes on chromosome 4, suggesting that they belong to a gene family. The elucidation of the genomic organization of theAsr gene family may help in understanding the role of its members in the response to osmotic stress, as well as in fruit ripening, at the molecular level.

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Correspondence to N. Iusem.

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Communicated by J. Schell

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Rossi, M., Lijavetzky, D., Hopp, H.E. et al. Asr genes belong to a gene family comprising at least three closely linked loci on chromosome 4 in tomato. Molec. Gen. Genet. 252, 489–492 (1996).

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Key words

  • Lycopersicon esculentum
  • Asr
  • RFLP mapping
  • Gene family