During the summer growing season, phosphate is at a high level. It has a vital role in the breakdown of the sugars manufactured by chlorophyll. But in the fall, phosphate, along with the other chemicals and nutrients, moves out of the leaf into the stem of the plant. When this happens, the sugar-breakdown process changes, leading to the production of anthocyanin pigments. The brighter the light during this period, the greater the production of anthocyanins and the more brilliant the resulting color display. When the days of autumn are bright and cool, and the nights are chilly but not freezing, the brightest colorations usually develop. COUNT 5
QSN1 At which period of the year are phosphates high? ANS1 the summer growing season QSN2 What causes sugar created by chlorophyll to breakdown? ANS2 phosphate QSN3 Where does phosphate within a leaf move in the fall? ANS3 the stem of the plant QSN4 What is created in fall when phosphates retreat to the stems of plants? ANS4 anthocyanin pigments QSN5 What occurs in bright light to leaves during fall? ANS5 greater the production of anthocyanins