Mature Tubehere Free [ 4K ]
| Day post‑harvest | PPD score (mean ± SE) – MTF‑02 | PPD score – ‘Beauregard’ | |------------------|-------------------------------|--------------------------| | 3 | 0.9 ± 0.2 | 1.7 ± 0.3 | | 7 | 1.5 ± 0.3 | 2.8 ± 0.4 | | 14 | 2.1 ± 0.3 | 3.8 ± 0.4 |
All MTF lines displayed a 40‑50 % reduction in PPD severity at 14 days (p < 0.001). Sprouting incidence after 30 days was also lower (MTF‑03: 12 % vs. 28 % for controls).
PCA showed the first two components explaining 68 % of variance, separating lines by dry‑matter and carotenoid loadings. mature tubehere free
| Variable | Timing | Method | |----------|--------|--------| | Fresh‑weight yield | Harvest (90‑DAP) | Harvest all tubers per plot, weigh (kg ha⁻¹). | | Dry‑matter | Harvest | Oven‑dry subsample at 70 °C to constant weight. | | β‑Carotene | Harvest | HPLC (C30 column, 450 nm detection). | | Starch composition | Harvest | Enzymatic assay (Megazyme). | | PPD severity | 0, 3, 7, 14 days post‑harvest | Visual rating 1‑5 (1 = none, 5 = severe). | | Sprouting incidence | 30 days storage | Count sprouted tubers per plot. | | Consumer hedonic scores | Post‑cooking (steam 30 min) | 9‑point scale; n = 180 participants. | | Economic variables | Post‑harvest | Market price, storage cost, labor. |
Assumptions:
Net return per hectare (including a 4‑week extended market window):
| Genotype | Gross revenue | Storage cost (4 wks) | Premium revenue | Net profit | |----------|---------------|----------------------|----------------|------------| | MTF‑02 | $8,145 | $2,448 | $1,220 | $6,917 | | ‘Beauregard’ | $7,800 | $2,160 | $0 | $5,640 | | Day post‑harvest | PPD score (mean ±
The MTF line yields a + 23 % profit increase, driven by premium pricing and reduced post‑harvest loss.
