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Table 2
Summary of key morphological capsule traits for assessing shatter resistance.
| Trait | Brief description | Scoring range | Optimal score for mechanized harvest |
|---|---|---|---|
| Capsule Dehiscence Score | Extent of longitudinal splitting from apex to base (Fig. 2a). | 0 (Fully Open) 8 (Intact) | 1 (Facilitates threshing) |
| Capsule Valve Opening Score | Degree of separation between valves at the capsule apex (Fig. 2b). | 0 (Fully Open) 8 (Closed) | 7 (Allows drying, prevents loss) |
| Membrane Coverage Score | Extent of membrane covering the seed cavity (Fig. 2c). | 0 (None) 8 (Full) | 7 (Retains seeds but is fragile enough for threshing) |
| Capsule Compactness Score | Tightness of the dried capsule, retaining seeds when inverted (Fig. 2d). | 0 (Loose) 8 (Tight) | 4–5 (Balances retention and release) |
| Seed–Placenta Adhesion Score | Strength of seed attachment to the central placenta (Fig. 2e). | 0 (None) 8 (Strong) | 7 (Withstands field vibration but yields to threshing) |
| Membrane–Placenta Contact Score | Proximity of the membrane to the placental axis. | 0 (None) 8 (Complete) | 5–8 (Retains seeds without hindering threshing) |
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