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Table 3 The methods of phenotype standardized for peach fruit quality traits

From: Construction of a high-density SNP-based genetic map and identification of fruit-related QTLs and candidate genes in peach [Prunus persica (L.) Batsch]

Trait Unit of measure
Fruit development period (FDP) days from full bloom to fruit ripening (d)
Fruit weight (FW) grams
Fruit diameter (FD) the diameter across cheek area (mm)
Percentage of red skin color (PSC) %
Red in flesh (RF) 0 = no red overlay; 1 = red overlay
Red around pit (RP) 0 = no red; 1 = red
Adherence to pit (AP) 1 = freestone; 2 = semi-freestone; 3 = clingstone
Eating quality (EQ) 1 = extremely poor; 2 = poor; 3 = fair; 4 = good; 5 = excellent
Fruit flavor (FV) 1 = sour; 2 = sour-sweet; 3 = water sweet; 4 = sweet; 5 = rich sweet
Fruit fiber content (FFC) 1 = few; 2 = intermediate; 3 = many
Soluble solid content (SSC) %
Fruit acidity content (FA) %