Effects of Sulfur Dioxide on Apparent Photosynthetic Rate in Winter Cereals

[摘要] Invisible injury caused by air pollution is known to make photosynthesis decrease, and thus yields decrease. The purpose of this investigation was to make clear the effects of sulfur dioxide on winter cereals, which included 4 spcies and 67 cultivars. Sulfur dioxide was supplied at the rate of 2.6mg SO2m-3 (about 1.0 ppm v/v)for 30 min and then displaced with clean air for 30 min. The aparent photosynthetic rate of individual plants was continuously measured at the booting stage of each cultivar. In all plants, apparent photosynthetic rates were depressed by the application of sulfur dioxide. The magnitude of the of the depression in apparent photosynthesis was observed in the following order : naked barley, 45.6%>wheat, 38.6%>six-rowed barley, 31.5%>two-rowed barley, 28.4%. Nearly 90% of recovery in apparent photosynthesis was observed for all entries. In conclusion, injurious effects of sulfur dioxide on apparent photosynthesis were different among species of winter cereals. Naked barley was most susceptible to SO2 stress, and two-rowed barley was most tolerant.

[学科分类] 农业科学（综合）

[关键词] Naked barley;オオムギ;Photossynthesis;光合成;Six-rowed barley;コムギ;Sulfur dioxide;二酸化硫黄;Two-rowed barley;二条オオムギ;Wheat;ハダカムギ;六条オオムギ