Candidate genes and QTLs for fruit ripening and softening in melon |
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Authors: | Eduard Moreno Javier M Obando Noelia Dos-Santos J Pablo Fernández-Trujillo Antonio J Monforte Jordi Garcia-Mas |
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Institution: | (1) IRTA, Centre de Recerca en Agrigenòmica CSIC-IRTA-UAB, Carretera de Cabrils Km2, 08348 Cabrils, Barcelona, Spain;(2) Department of Agricultural and Food Engineering, Technical University of Cartagena (UPCT), ETSIA and Institute of Plant Biotechnology, 30203 Cartagena, Murcia, Spain |
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Abstract: | Different factors affect the quality of melon fruit and among them long shelf life is critical from the consumer’s point of
view. In melon, cultivars showing both climacteric and non-climacteric ripening types are found. In this study we have investigated
climacteric ripening and fruit softening using a collection of near-isogenic lines (NILs) derived from the non-climacteric
melon parental lines PI 161375 (SC) and “Piel de Sapo” (PS). Surprisingly, we found that QTL eth3.5 in NIL SC3-5b induced a climacteric-ripening phenotype with increased respiration and ethylene levels. Data suggest that
the non-climacteric phenotypes from PI 161375 and “Piel de Sapo” may be the result of mutations in different genes. Several
QTLs for fruit flesh firmness were also detected. Candidate genes putatively involved in ethylene regulation, biosynthesis
and perception and cell wall degradation were mapped and some colocations with QTLs were observed. These results may provide
additional data towards understanding of non-climacteric ripening in melon. |
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