著者

Atsuko Uragami Reiichirou Ueno Atsushi Yamasaki Kentaro Matsuo Takayuki Yamaguchi Hideo Tokiwa Tamio Takizawa Hiroaki Sakai Takao Ikeuchi Shin-ichi Watanabe Kuninori Matsunaga Miyuki Kunihisa Hiroaki Kitazawa Satoru Motoki

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-115, (Released:2016-03-30)

被引用文献数

11

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This study analyzes the first large-scale asparagus experiment in Japan to examine the productive differences between male and female plants using the rootstock-planting forcing culture technique. This technique has recently been developed in Japan and uses dug-up rootstocks for one-season harvests during the off-crop season. As larger spears and early sprouting are especially favored in this culture for higher yield, it is important to clarify and evaluate the productive traits of the male and female plants. We conducted collaborative research among eight institutes from Hokkaido to Kyushu to examine plants grown at different cultivation sites. There were two digging-up months and different low-temperature backgrounds. Plant rootstocks sourced from the eight different sites used in the experiment were cultured in an abandoned tunnel in Nagano Prefecture, Japan, in a large area with uniform temperature and high humidity throughout the year, and their white spears were harvested. The results of this study show that the female plants had a significantly higher rootstock weight, weight per spear per plant, and weight per early spear per plant, whereas the male plants had a significantly higher total spear number per plant, early spear number per plant, and significantly fewer days to first harvest. No significant differences were observed in soluble solid contents of roots, total spear weight per plant, or early spear weight per plant. It seems that male plants have a tendency to sprout earlier than female plants in response to reduced accumulated low temperature hours, and also to produce a higher total spear number per rootstock weight and total spear weight per rootstock weight. The ranges of most of the productive traits analyzed in this study completely overlapped between the sexes. However, female plants showed higher variation in weight per spear per plant and weight per early spear per plant.

著者

Shin-ichi Watanabe Masanori Matsuo Hiroaki Kitazawa Machiko Fukuda Atsushi Yamasaki Atsuko Uragami

出版者

The Japanese Society for Horticultural Science

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.OKD-161, (Released:2018-11-15)

被引用文献数

1

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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°C (30°C treatment), 34°C (34°C treatment), 38°C (38°C treatment), and 42°C (42°C treatment) for 14 days, and then at 25°C for 18 days. In the 42°C 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°C treatment than in the 30°C treatment, whereas after the high temperature periods, the number was significantly higher in the 38°C treatment than in the 30°C and 34°C treatments. The total number of sprouted spears during and after the high temperature periods was not significantly different between the 30°C, 34°C, and 38°C treatments. The elongation rate of the spears during the high temperature period was significantly lower in the 38°C treatment than in the 30°C and 34°C 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°C can be used to control spear sprouting reversibly by its application and cancellation.