Chapter 20, Problem 31P

(a)

Summary Introduction

To determine: The factors that shift the starch and sucrose synthesis reactions in favor of starch synthesis.

Introduction:

Starch acts as a storage material in plant cells. Starch is polysaccharide of glucose which is formed by the polymer of $\text{α-glucose}$ units. The $\text{α-glucose}$ monomer forms the branched and unbranched structure of starch molecules. The branched structure molecules of glucose are linked through $\text{β-1,6-glycosidic bond}$.

(b)

Summary Introduction

To determine: The factors that shift the starch and sucrose synthesis reactions in favor of sucrose synthesis.

Introduction:

Calvin cycle result in the production of triose phosphate which stored temporarily in chloroplast and gets converted into sucrose in cytosol of plant. This sucrose then transported to all nonphotosynthetic parts of plant. Thus, the formation of triose phosphate and its conversion into sucrose is tightly regulated and coordinated with rate of a carbon fixation.