Arabidopsis plants that have mutant AtSUC2 alleles accumulate sugar and starch in their mature leaves.What process might these plants be unable to carry out?

Question

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AtSUC2 is a sucrose transporter protein that plays a critical role in phloem loading. Without functional AtSUC2 alleles, the plant is unable to properly transport sucrose from source tissues (e.g. mature leaves) to sink tissues (e.g. roots, developing fruits), resulting in accumulation of sugar and starch in the mature leaves. The other processes listed are not directly related to sugar transport and are therefore not affected by mutations in AtSUC2.

Arabidopsis Plants That Have Mutant AtSUC2 Alleles Accumulate Sugar and Starch