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Published online 27 March 2006
Published in Crop Sci 46:1156-1168 (2006)
© 2006 Crop Science Society of America
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Response of Stored Potato Seed Tubers from Contrasting Cultivars to Accumulated Day-Degrees

P. C. Struika,*, P. E. L. van der Puttena, D. O. Caldizb and K. Scholtea

a Crop and Weed Ecology (CWE) Group, Dep. of Plant Sciences, Wageningen Univ., Haarweg 333, 6709 RZ Wageningen, the Netherlands
b McCain Argentina, Balcarce, Argentina


Figure 1
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Fig. 1. Schematic presentation of storage treatments, their codes and accumulated temperatures (T-sums) of Exp. 1 through 3 (Fig. 1A) and Exp. 4 (Fig. 1B). The storage period of each experiment was subdivided into different phases of 6 (Exp. 4), 7.5 (Exp. 2 and 3), or 8 (Exp. 1) wk, giving four phases in the first three experiments and five phases in Exp. 4. Different treatments were created by assigning a low or a high temperature to the different phases. For Exp. 1 through 3, we only selected treatments with constant temperature during the first two phases and the last two phases. Treatments were coded by indicating the temperature (L for low and H for high) followed by the number of phases that such a temperature was maintained. Treatments without a temperature switch are indicated by L4 or H4 (Exp. 1–3) or L5 or H5 (Exp. 4) for a low storage temperature throughout the storage period and high storage temperature throughout the storage period, respectively. In Exp. 1 through 3, the treatments with a switch in storage temperature from low to high are indicated by L2H2, treatments with a switch in storage temperature from high to low are indicated by H2L2. Similarly, in Exp. 4, the letters L and H in the treatments with temperature switches are followed by the numbers 1, 2, 3, or 4 indicating the number of phases that a specific temperature was maintained. These codes are listed behind the schematic representation of the treatments and followed by the temperature sum over the entire storage period in the different experiments.

 

Figure 2
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Fig. 2. The effect of the thermal time accumulated after the onset of sprouting (see Table 3) on the performance of six cultivars differing in relative rate of physiological ageing (see Table 1) when harvested between 13 and 20 July, depending on maturity type (Exp. 4). Open symbols for the seed lots exposed to low (L) temperature during the entire storage period or for the treatments starting with low temperature; black symbols for the seed lots exposed to high (H) temperature during the entire storage period or for treatments starting with warm storage. Dm = dry matter.

 

Figure 3
Figure 3
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Fig. 3. Four quadrant figures indicating the relationships between thermal time during controlled storage and number of stems or number of tubers produced per m2 and tuber dry matter (dm) yield at late harvest (28 August–23 October, depending on maturity type), for six cultivars differing in relative rate of physiological ageing (Exp. 4). Open symbols for the seed lots exposed to low (L) temperature during the entire storage period or for the treatments starting with low temperature; black symbols for the seed lots exposed to high (H) temperature during the entire storage period or for treatments starting with warm storage.

 





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