... formation of seedless pods (93). Tissues at the base of the leaf show signs of breakdown, and the stalk towardthe top of the plant may show a distorted or twisted type of growth. The death of the ... complexation of o-diphenol inhibitors of IAA oxidase. Excessive auxin activity causesexcessive proliferation of cambial cells, rapid and disproportionate enlargement of cells, and col-lapse of nearby ... Boron248 Handbook of Plant NutritionFIGURE 8.2 Symptoms of boron deficiency in cauliflower (Brassica oleracea var. botrytis L.) showingbrown, waterlogged patches, and rotting of the core of the...