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ARS Home » Midwest Area » Madison, Wisconsin » Vegetable Crops Research » Research » Publications at this Location » Publication #347418
Title: QTL mapping of flowering time, fruit size and number in populations involving andromonoecious true lemon cucumber

Author
item PAN, YUPENG - University Of Wisconsin
item WEN, CHANGLONG - National Engineering Research Center For Information Technology In Agriculture
item WANG, YUHUI - University Of Wisconsin
item CHENG, XIAOMAO - University Of Wisconsin
item Weng, Yiqun

Submitted to: Plant and Animal Genome
Publication Type: Abstract Only
Publication Acceptance Date: 1/5/2018
Publication Date: 1/13/2018
Citation: Pan, Y., Wen, C., Wang, Y., Cheng, X., Weng, Y. 2018. QTL mapping of flowering time, fruit size and number in populations involving andromonoecious true lemon cucumber [abstract]. Plant and Animal Genome XXVI Proceedings. Paper No. P0714.

Interpretive Summary:

Technical Abstract: Andromonoecious sex expression in cucumber is controlled by the m locus, which encodes the 1-aminocyclopropane-1 –carboxylic acid synthase (ACS) in the ethylene biosynthesis pathway. This gene seems to have pleotropic effects on fruit size and number, but the genetic basis is unknown. The True Lemon cucumber is an andromonoecious heirloom bearing lemon-sized and nearly round fruits. A recombinant inbred population (RIL) was developed from the cross between True Lemon and the gynoecious cucumber inbred line WI2757, which was used in QTL mapping for flowering time (FT), fruit number (FN), mature fruit length (MFL) and diameter (MFD). Phenotypic data for the four traits were collected from 139 RILs in field trials across multiple environments. Two linkage maps were developed using 129 microsatellite markers as well as 1845 genome-by-sequencing (GBS)-based SLAF markers. QTL analysis identified 15 QTL for the four traits including 1 for FT (ft1.1), 3 for MFL (mfl1.1, mfl1.2, and mfl6.1), 5 for MFD (mfd1.1, mfd1.2, mfd4.1, mfd5.1, and mfd6.1), and six for FN (fn1.1, fn3.1, fn4.1, fn5.1, fn6.1, and fn7.1). Among these QTL, ft1.1, mfl1.2, mfd1.2, and fn1.1 were all major-effect QTL for FT, MFL, MFD and FN, respectively, which were consistently co-localized at the m gene region on cucumber Chromosome 1 suggesting possible pleiotropic effects of the m locus on expression of these traits. The effect of andromonoecy on fruit size and fruit number in this population will be discussed.