Effects of high temperature treatment on the sprouting and elongation rate of asparagus spears
2019
Watanabe, S. (Kyushu Okinawa Agricultural Research Center, NARO, Kurume (Japan). Kurume Research Station) | Matsuo, M. | Kitazawa, H. | Fukuda, M. | Yamasaki, A. | Uragami, A.
In this study, we investigated the effect of high temperature on spear sprouting and elongation in asparagus to explore new approaches to control the harvest period in asparagus production. Four-year-old rootstocks of 'UC157' were grown in chambers in the dark at 30℃ (30℃ treatment), 34℃ (34℃ treatment), 38℃ (38℃ treatment), and 42℃ (42℃ treatment) for 14 days, and then at 25℃ for 18 days. In the 42℃ treatment, no spear sprouting was detected, and all rootstocks died. During the high temperature period, the number of sprouted spears was significantly lower in the 38℃ treatment than in the 30℃ treatment, whereas after the high temperature periods, the number was significantly higher in the 38℃ treatment than in the 30℃ and 34℃ treatments. The total number of sprouted spears during and after the high temperature periods was not significantly different between the 30℃, 34℃, and 38℃ treatments. The elongation rate of the spears during the high temperature period was significantly lower in the 38℃ treatment than in the 30℃ and 34℃ treatments, whereas there were no significant differences in the mean spear elongation rate after the three high temperature treatments. These results suggest that a temperature of 38℃ can be used to control spear sprouting reversibly by its application and cancellation.
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