... growing pollen cell wall (Loewus and Labarca, 1973). Laminarin, a linear glucan containing mainly &D-( 1-3) linked glucose, with some p-~-(1+6) branching points, is found in Laminaria, ... wild- type recombinants by staining the pollen with iodine reagent (Wx pollen, containing normal starch, stains black; wx pollen, lacking amylose, stains red) and, by counting the frequency ... present in the inner regions of B-chains and two-thirds are present in the outer parts of the B-chains and in the A-chains. The position of the esterified phosphates at C-6 can be determined using...