Predominantly symplastic phloem unloading of photosynthates maintains efficient starch accumulation in the cassava storage roots (Manihot esculenta Crantz)

Table 2 Plasmodesmata density in the cell walls of SE-CC and PC cells in the late storage and fibrous roots of cultivated Arg7 cassava

Plasmodesmata density (Number per μm)
SE-CC		SE-CC/PC	PC/PC
Primary fibrous root	0.013 ± 0.021	0.007 ± 0.019	0.030 ± 0.032
Secondary fibrous root	0.008 ± 0.007	0.001 ± 0.001	0.049 ± 0.022
Elongation stage of tuberous root	0.033 ± 0.026	0.022 ± 0.015	0.095 ± 0.023
Middle stage of storage root	0.040 ± 0.024	0.027 ± 0.018	0.147 ± 0.035
Later stage of storage root	0.032 ± 0.025	0.021 ± 0.021	0.100 ± 0.065

Plasmodesmata were counted on five scopes that were selected from six ultrathin sections for each sample, and the value above are the means ±SE (individuals). Abbreviations: SE, sieve element; CC, companion cell; PC, parenchyma cell

ISSN: 1471-2229