Table 2.
Evaluation of state of plugging of sieve plates (SPs) of the penetrated sieve elements (SEs) in TGR‐1551 and Iroquois melon. Entries are the number of samples in each score category for TGR‐1551 (total 26 samples) and Iroquois (total 20 samples) melons
| Score | TGR‐1551 | Iroquois |
|---|---|---|
| 1. Both SPs of penetrated SE are plugged | 9 | 0 |
| 2. Both SPs of the penetrated SE were identified; one is plugged; other unplugged or only partially plugged | 4 | 3 |
| 3. One SP of the penetrated SE was identified and is plugged; other SPs that could potentially be at the other end of the SP also are plugged | 4 | 0 |
| 4. One SP of the penetrated SE was identified and is plugged; other SP was not found | 4 | 1 |
| 5. Cannot identify the penetrated SE; at least one SP in the area around the stylets is plugged | 2 | 1 |
| 6. One SP of the penetrated SE was identified and appears to be partially clear with some presumed protein encroaching from a parietal position and covering about half the SP; other SP was not found | 0 | 1 |
| 7. Stylet tips are in a companion cell (CC)—the SE associated with the CC has one plugged and one clear SP; another nearby SP of a nonpenetrated SE was plugged | 1 | 0 |
| 8. Penetrated SE has reticulated substance on SP; another nearby SP of a nonpenetrated SE is lightly plugged | 1 | 0 |
| 9. Both SPs of penetrated SE are clear | 0 | 6 |
| 10. One SP of the penetrated SE was identified and is clear; the other SP was not found; no plugs were seen in the area where the other end of the SE would be located | 0 | 5 |
| 11. Cannot positively ID the SPs of the penetrated SE but no plugs seen in the area | 1 | 2 |
| 12. At least one SP of penetrated SE is clear; the other SP was not found; some plugged SPs in nonpenetrated cells were found | 0 | 1 |