Stomata Variations in Canada Thistle and Response to Herbicides
- 1 January 1972
- journal article
- research article
- Published by Cambridge University Press (CUP) in Weed Science
- Vol. 20 (1) , 68-70
- https://doi.org/10.1017/s0043174500034974
Abstract
Canada thistle(Cirsium arvense(L) Scop.) includes many regional races that are heritable, distinct ecotypes. When cultured at Bozeman, Montana a group of these ecotypes varied in phenological, morphological, and anatomical characteristics. These ecotypes also responded differently to (2,4-dichlorophenoxy)acetic acid (2,4-D) and 3-amino-s-triazole (amitrole). Stomatal frequency and area on leaves also differed among ecotypes studied. Although stomatal frequency and stomatal area differed among the ecotypes studied, there was no correlation with herbicide response. Apparently, stomata were not a significant portal of entry of 2,4-D into the upper surface of Canada thistle leaves.Keywords
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