Recently in tomatoes is observed when cutting longitudinal white streaks that our Farmers believe that because of the nitrate accumulation as you see in the attached picture.
NO Nitrates.... might be excessive fertilizers... I think No disorder too .. The some of newer varieties of tomatos has this feature - this is variety issue... Newer hybrid varieties to produce firmer fruit develop this type of white centers or sector. it increasing of shipment ability and storage..... old varieties which have more juice pulp - never has this problem...