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A Long-Term Response of Chlorophyll Fluorescence Induction to One-Shot Application of Cyanazine on Barley Plants and Its Relation to Crop Yield

1999; Institute of Experimental Botany of the Czech Academy of Sciences; Volume: 37; Issue: 2 Linguagem: Inglês

10.1023/a

1573-9058

Martina Matoušková, Jan Nauš, Marie Flašarová,

Growth and nutrition in plants

Field-grown plants of spring barley (Hordeum vulgare L. cv. Akcent) in the growth phase 30 DC (beginning of stem extension) were exposed to a one-shot application of a commercial product containing cyanazine (Bladex 50 SC) in two doses, C30 and C60 (30 and 60 mg m-2). The reaction of the plant photosynthetic system was followed non-destructively using chlorophyll fluorescence induction (the O-J-I-P transient) within three weeks after the application in the fifth developed leaf and three further gradually appearing leaves. An immediate response of plants to the application of cyanazine and a regeneration of plants from cyanazine action were detected. The biological (plant dry mass) and crop yield production (the number and mass of grains in a spike) were analyzed in time of full ripeness. The crop yield was lowered by the herbicide effect to the same level for the two doses used.