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. 2016 Oct 28;172(4):2388–2402. doi: 10.1104/pp.16.00916

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Figure 5. — Starch turnover in starch biosynthesis mutant lines. A, Strong starch accumulation in a wild-type (WT) cauline leaf at the end of the light phase. B, Starch accumulates in the peduncle (arrow) and the receptacle (arrowhead) of young wild-type buds. C, Highly reduced starch accumulation in mesophyll cells of a pgi1-1 cauline leaf at the end of the light phase. Higher starch accumulation, however, is maintained around vascular tissues (arrow). D, Starch accumulates in the peduncle (arrow) and the receptacle (arrowhead) of young pgi1-1 mutant buds. E and F, No starch accumulation is observed in any tissue of cauline leaves (E) or young buds (F) of the pgm1-1 mutant at the end of the light phase. G and H, While no strong effect is observed on starch accumulation in cauline leaves (G), an appreciable reduction is seen in young gpt1-3 buds (H) at the end of the light phase. I1 to I3, Different stages of pgi1-1 stamen development illustrating that the second and third waves of starch accumulation were not affected. J1 to J3, pgm1-1 stamen at different stages illustrating the absence of starch accumulation during anther development. K1 and K2, Unaffected second (K1) and third (K2) starch synthesis waves in gpt1-3 stamen. L to O, Starch distribution in wild-type (L), pgi1-1 (M), pgm1-1 (N), and gpt1-3 (O) flowers just before anthesis. Note the reduced starch accumulation in pgi1-1 sepals, the absence of starch accumulation in the whole pgm1-1 flower, and the reduction of starch accumulation in the gpt1-3 pistil. P, Typical starch accumulation in wild-type ovules at anthesis. Q, Highly reduced starch accumulation in gpt1-3 ovules. Note the absence of conspicuous starch accumulation in the central cell. R1, Closeup image of starch accumulation in wild-type ovules. R2 and R3, Closeup images of reduced (R2) and highly reduced (R3) starch accumulation in gpt1-3 ovules. R4 and R5, Reduced starch accumulation in gpt1-3 during early embryo development (arrow in R4) and in the silique valves (R5). Note the unaffected starch accumulation in more advanced seeds. S1 to S3, Unaffected starch accumulation during different stages of ovule and embryo development in pgi1-1. T1 to T3, Absence of starch accumulation at different stages of ovule and embryo development in pgm1-1. Bars = 20 μm.