the occurrence of differently coloured areas on leaves or petals due to virus infection (streaks, spots, mottles), mineral deficiency (veinal or interveinal chlorosis), genetically determined patterns, rohelistel taimedel korrapäratult paigutunud mitmesuguse värvitugevusega tume- kuni helerohelised laigud, kloroplastide ebaühtlase jaotumise tagajärg