萎凋処理がグレインソルガム各部の発育におよぼす影響

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To investigate the influence of various wilting treatments on the development of plant parts of grain sorghum (Sorghum bicolor (L.) Moench) hybrid H-726, two pot experiments under glasshouse condition was conducted in the Nagoya University, Experimental Farm in 1977. Exp. I : The seeds were planted in Wagner's pot on July 21. Nine drought treatments with 4 days interval were started at 6th leaf shooting stage on August 4. Since heading occurred at different time, the time for harvesting was also different. Exp. II : The sorghum seeds were planted in Wagner's pot on June 7. Four wilting treatments, first wilting (A), successive wilting (B), successive wilting +3 days (C) and successive wilting +6 days (D) were started at each of the following growth stages, 9th and 12th leaf shooting stage, heading stage and ten days after heading. Heading occurred at same time on August 1 and the plants were harvested on September 26. The results obtained are summarized as follows : 1. Plants with larger size, higher whole plant fresh weight, greater panicle fresh weight were obtained at 8 and 12 days drought, but for panicle length and number of grains per panicle no significant differences existed between the drought treatments. 2. Plants grown under control and 4 days drought conditions had higher leaf number i. e. number of times of irrigation and number of leaves have a positive relationship. 3. The higher dry weight of panicle and grain dry weight per panicle were obtained at 8 and 12 days drought, while grains with larger size were abtained at control and 4 days drought. There is a negative relationship between drought treatments and size of grain. 4. Total number of roots was higher than control at 4, 8 and 12 days drought and decreased as the drought days in creased, but the reverse was true for elongated root. At 4 days drought the roots appeared from upper node. 5. Whole plant fresh weight, panicle fresh weight and plant height were higher at first wilting (A) in all four growth stages. 6. There is no significant differences in panicle length between wilting treatments. 7. Peduncle length was higher at all wilting treatments at 9th and 12th leaf shooting stage, but it was lower than control at heading stage because there was no irrigation during peduncle elongation. There was no significant differences between wilting treatments and control for peduncle length at 10 days after heading stage. 8. Panicle dry weight and grains dry weight per panicle were greater at first wilting (A) treatment of 9th and 12th leaf shooting stage and heading stage, but they were smaller than control at 10 days after heading stage, because there was no irrigation during the grain filling. 9. Number of grains per panicle was higher in control and it was higher in first wilting (A) than other treatments, but at first wilting (A) of all growth stages large sized grain obtained. 10. When wilting treatments were started, the length of leaf sheaths, leaf blades and internodes which just began to elongate and those about to elongate decreased. The decrease was lower for sheaths and internodes but higher for blades. There was no change in sheath lengths after this decline, however, the changes in the lengths of blades and internodes were higher than control. This explains the reason why plant height was greater than control. 11. There is no significant differences between wilting treatments at all growth stages for total number of roots and number of elongated root.
日本作物学会の論文
1978-11-30

萎凋処理がグレインソルガム各部の発育におよぼす影響

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