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| Treatment | Collection time | Sample | Lugol staining |
| I | 5 wks. | A–H | + |
| Control (I–J) | − | ||
| 12 wks. | A–H | + | |
| Control (I–J) | − | ||
| II | 5 wks. | A–F | + |
| Control (H) | − | ||
| 12 wks. | A–F | + | |
| Control (H) | − |
Potato stem - tops were sliced and reacted with lugol solution to determine presence of starch. Positive (+) indicates that tissue reacted with the lugol solution displaying a dark blue color, and negative (−) indicates that the tissue remained the same color.
