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Taroudant, Morocco

Radouani A.,Domaines Royaux El Boura | Lauer F.I.,University of Minnesota
American Journal of Potato Research | Year: 2015

Tuber yield of plants from three sizes of in vitro produced microtubers were compared to yields of plants from three sizes of greenhouse produced minitubers of Nicola and Russet Burbank. Microtubers were: small-size, 0.2–1.5 g; mid-size, 1.5–3.0 g; and large-size, >3.0 g. Minitubers were: small-size, 15–20 g; mid-size, 20–40 g; and large-size, >40 g. Both cultivars produced more tubers with micro than with minitubers, 1,033,333 vs. 568,750 tubers/ha−1 for Nicola and 605,417 vs. 482,291 tubers/ha−1 for Russet Burbank. Within the same type of tuber, Nicola was not influenced by size. With Russet Burbank, however, large-size microtubers produced the highest number of tubers, 606,875 per ha−1, and small-size minitubers gave the lowest tuber number, 409,375 tubers/ha−1. Regarding tuber yield, the type of tuber did not influence either cultivar. Nicola was influenced neither by type nor by size of tubers. Russet Burbank, however, was sensitive to size of tubers, especially, within minitubers. Large-size mini and microtubers were the most productive, 49 and 40 t ha−1, respectively. © 2015, The Author(s).

Radouani A.,Domaines Royaux El Boura
American Journal of Potato Research | Year: 2015

Our objective was to test whether the NPK levels in commonly used Murashige and Skoog (MS) media are optimal for microtuberiztion for the two cultivars tested. Two N (N1 = 841 and N2 = 1418 mg L−1); three P (P1 = 39, P2 = 76.9 and P3 = 115 mg L−1; and two K (K1 = 784 and K2 = 1518 mg L−1) media concentrations were evaluated for microtuberization. Higher levels of N2P3K2 were more effective for microtuberization than the lower levels of N1P1K1 in standard MS media. N2P3K2 was the best concentration for all yield components studied, tuber number, tuber weight, and stem and root weight. For the two cultivars, our results suggest that higher NPK levels than those in MS media would enhance in vitro microtuberization, and that optimum NPK levels could vary for cultivars. © 2015, The Author(s).

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