Effects of leaf age, leaf area, and other factors on tuberization of cuttings from induced potato (Solanum tuberosum) shoots

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Abstract
Potato plants (Solanum tuberosum L. cultivars 'Belchip,' 'Chippewa,' 'Katahdin,' and 'Norchip') were grown in a glasshouse under continuous light. Thereafter, various photoperiodic treatments were given to these plants and cuttings were taken from the shoots. Different excision treatments were applied to the cuttings, which were then placed in a mist bench under continuous light and examined for tuberization after 12 days. Young, fully expanded leaves were most effective in supporting tuberization of cuttings from induced plants; but even very young or very old leaves increased tuberization. In proportion to growth at aerial buds, there was often more tuberization from a small leaf area consisting of young, expanding and fully expanded leaves than from a large area of older, more senescent leaves. The shoot apex also contributed to tuberization of induced cuttings. Induction to tuberize led to a shift from aerial bud growth to underground bud growth. For a given leaf age, partitioning of dry matter to underground buds rather than to aerial buds was decreased by reducing the leaf area and increased by increasing the level of induction.

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