グラジオラス球茎の休眠(第2報) : 温度処理と抑制物質いついて

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The purpose of this study was to ascertain the varietal differences in response to breaking the dormancy of the gladiolus corms by the temperature treatment, and to determine the growth and inhibiting substances present in the gladiolus bud by the method of paper chromatography, followed by the Avena bioassay as reported by LUCKWILL. The varieties used for experiments were Gover-nor Pincot, Hector, Red Charm, Snow Princess, Spotlight and Valeria in 1954, and Atom, Bo Peep, Jonquill, June Day, and White Gold in 1955. The corms were planted at Oshima Experimental Farm in early February in both years. On the 6th and 30 th of August the corms were dug, and were treated by the high temperature (35°C) for 10 or 15 days followed by the cold storage (0°C) for 10 or 15 days in 1954. In 1955, on August 6th and September 5 th the corms were dug, and were placed in a thermostat 35°C for 10 days followed by 2°C storage. After the temperature treatment, the sprouting percentage was observed, and the growth and inhibiting substances of Bo Peep corms at planting and sprouting times were determined by the chromatography and the Avena test. The results of the present study are summarized as follows 1) The percentage of the sprouting of early-dug corms was lower than that of late-dug corms, but early-dug Governor Pincot sprouted exceptionally high and early. June Day responded similarly but its percentage was not high as Governor Pincot. 2) In all experiments, with every varieties, treatment at 35°C for 10 days followed by cold storage for 10 or 15 days appeared to have the largest effect for breaking dormancy. 3) The extraction of growth and inhibiting substances from gladiolus corms into two fractions, neutral and acidic, was carried out by the method which is indicated in Fig. 1. 4) Results obtained from the acidic and neutral fractions of corm extracts taken at three dates from the time of planting to the time of sprouting are shown in the histograms (Fig. 2 and 3). 5) The inhibitor was found in acidic and neutral fractions of samples taken up on Oct. 25 th, at the time of sprouting. On the contrary, the growth substance appeared in acidic and neutral fractions of treated corms of samples taken on Nov. 29th.
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グラジオラス球茎の休眠(第2報) : 温度処理と抑制物質いついて

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