Studies on Plant Response to Rainfall.:(V) Changes of Plant Status by Long-term Exposure to Mist
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The effect of long-term exposure to mist on elongation, fresh weight, dry weight and water content of kidney bean grown in growth chamber (20°C, 6, 000lx) was investigated.1) Water-mist treatment increased the elongation and fresh weight of the primary leaves during the first 24 hours, but the rate of increase decreased from the second day on. The leaves of the misted plants did not grow thicker, although those of the non-misted plants did. Mist treatment increased the dry weight and chlorophyll content of the leaves, but the rates of increase were smaller than those of the non-misted plants.2) The stem of the misted and non-misted plants elongated almost similarly. Mist treatment greatly increased the fresh weight and water content of the stems, but greatly decreased dry weight.3) Length, fresh weight and water content of root of the misted and the non-misted plants seemed to be similar, but the roots of the plants misted for 6 days were somewhat longer than those of the non-misted plants. Dry weight of the roots during the first 2 days of mist treatment increased similarly as the control plants, but from the fourth to sixth day of mist treatment it was smaller than that of the non-misted plants.4) T-R ratios in fresh weight of the misted plants were higher than those of the non-misted plants, but the T-R ratios in dry weight were lower.5) In general, the elongation, fresh weight and dry weight of the three organs and chlorophyll content of the leaf of the plants exposed to mist for 6 days were smaller than those of the non-misted plants, except for root length and fresh weight of stem.6) Wetting of only the shoot by the exposure to mist had a similar effect as that when the vermiculite in the pot as well as the shoot was allowed to be wetted by the mist. The use of deionized water had a similar effect. Therefore, the effect of mist is probably caused by wetting of the shoot (mainly, leaf), and not by the high moisture in the rhizosphere or by any substance contained in the tap water.
- 日本農業気象学会の論文
日本農業気象学会 | 論文
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