Discovery of novel unfunctional <i>pAMT</i> allele <i>pamt</i><i><sup>10</sup></i> causing loss of pungency in sweet bell pepper (<i>Capsicum annuum</i> L.)

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  • Tsurumaki Keiichi
    United Graduate School of Agricultural Sciences, Iwate University
  • Sasanuma Tsuneo
    United Graduate School of Agricultural Sciences, Iwate University Faculty of Agriculture, Yamagata University

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  • Discovery of novel unfunctional pAMT allele pamt10 causing loss of pungency in sweet bell pepper (capsicum annuum L.)

Abstract

<p>Pungency is a characteristic trait of pepper (Capsicum spp.). Two genes, Pun1 and pAMT, are known as determinative factors of pepper pungency. To date, it has been considered that most bell-type sweet peppers (called piman and paprika, in Japan) possess the identical mutated Pun1 allele, pun1, whereas pAMT mutated non-pungent pepper has been found only in non-bell-type pepper. In this study, to reconsider the uniformity of the source of non-pungency in sweet bell pepper and explore new genetic resources, the presence of pun1 was investigated in 26 sweet bell pepper varieties. Among them, a seemingly common sweet bell pepper ‘Color Piman Yellow’ had the intact Pun1, in spite of its non-pungency. Sequencing and linkage analyses revealed that ‘Color Piman Yellow’ possessed a novel mutated pAMT allele, pamt10, that has a nonsense substitution at the 11th exon responsible for non-pungency. This is the first pAMT mutant to be found in sweet bell pepper. The finding that there was a pAMT mutant in sweet bell pepper suggests the possibility that more pAMT mutants exist unconsciously in other sweet bell peppers. The discovery of a new factor of non-pungency contributes to expanding the genetic diversity of sweet pepper varieties.</p>

Journal

  • Breeding Science

    Breeding Science 69 (1), 133-142, 2019

    Japanese Society of Breeding

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