Potato grafting experiments, II. Some further results with the short-day species,Solanum demissum
1. The wild Mexican potato,Solanum demissum, is a short-day type for tuber formation and under the long days of an English summer produces few tubers or none.
2. Top-grafted with scions ofS. tuberosum varieties tolerant of long days for tuber formation,S. demissum produces a much higher yield of tubers than when not grafted.
3. The tubers from plants grafted in the previous year produce plants which emerge and flower earlier than those from plants not grafted.
4. Grafting for two years may produce a larger yield of tubers than grafting for one year only.
5. For both time of emergence and time of flowering, grafting in the previous year was just as effective in most experiments as grafting for two or more years previously. Also a single year without grafting led to the disappearance of any effects from grafting.
Volume 100, 2021
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