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Hami melon ‘Queen’ ( Cucumis melo  ssp.  melo  var.  ameri  Pangalo) is the most widely cultivated and exported type of melon in Xinjiang Province, Northwest China. We previously found the unique traits of Hami melon ‘Queen’ for  wave seeds  and  tight-placenta  fruits. An analysis of the inheritance showed that these traits were controlled by two recessive genes  wave seed  ( ws ) gene and  tight-placenta  ( tp ) gene, respectively. Here, to identify these two traits and melon seed–related traits, segregation populations including BC 1  and F 2  derived from a cross between ‘Queen’ (P 1 ) and MR-1 (P 2 ) were used as mapping populations. Eighty-seven simple sequence repeat (SSR) markers were used in map construction of BC 1 P 1  population, and as a result,  ws  and  tp  were identified on linkage group 1. Analysis of quantitative trait locus (QTL) referring seed traits showed that QTL  ss1.1  for seed shape (SS) and QTL  sl1.1  for seed length (SL) were located at LG 1, supported by likelihood of odds (LODs) of 15.6 and 13.4, respectively, and both linked with  ws . Subsequently, the genetic linkage and parental re-sequence analysis were constructed for fine mapping  ws  and  tp . Genetic analysis showed that  ws  and  tp  were located in CM3.5_scaffold00060 on LG 1, flanked by InDelchr1-3241 and InDelchr1-3233. The 80.9-kb physical distance of this region included 11 candidate genes. Among them, MELO3C023549 and MELO3C023551 could be candidates for  ws  and  tp  by sequence alignment and allelic variation survey in parental lines. MELO3C023549 was predicted to encode an MYB46-like transcription factor related to positive regulation of secondary cell wall biogenesis. MELO3C023551 was annotated to encode a cellulose synthase A (CESA) associated with cellulose biosynthetic process.

Inheritance and Molecular Mapping of Tight-placenta Gene and Seed Traits in Chinese Hami Melon ‘Queen’