Crown-gall tumor tissue cultures release peroxidase into the medium in response to the concentration of specific ions in the medium. This release is not due to diffusion from cut surfaces or injured cells. Calcium, magnesium, and ammonium were, in that order, most effective in increasing peroxidase release. The enzyme was demonstrated cytochemically on the cell walls and in the cytoplasm. Cell ...

Phalaenopsis is an important ornamental pot plant for the global horticultural market. The inflorescences of hybrids require support from a stick during cultivation because weight multiple large flowers. Developing hybrid with sufficiently lignified inflorescence stem that does not additional could be way to reduce costs production. This study aimed (i) determine orientation and degree lignific...

There have been several recent electron-microscopic studies on the development of the vascular cambium (Bouck & Cronshaw, 1965; Buvat, 1963, 1964; Cronshaw, 1967; Esau & Cheadle, 1965; Srivastava & O'Brien, 1966; Northcote & Wooding, 1966; Wooding & Northcote, 1964; Wooding, 1966). The organelles involved have been tentatively identified and functions for each suggested. The present report is o...

Lignification is the process of forming the collective of phenylpropanoid macromolecules termed lignin. There are two ways to define lignin: 1) from a chemical point of view (i.e. its chemical composition and structure), and 2) from a functional view that stresses what lignin does within the plant. It has been recognized for 50 years now that lignin is a polymeric material composed of phenylpro...

Zinnia elegans Jacq. is an ornamental plant, widely used in landscaping. Heavy-metal pollution urban and rural areas still increasing, which determines the actuality of studying plants’ reactions to pollutants. was not sufficiently studied this regard, so aim our research identify morphophysiological changes species under excess copper concentration soil. For this, we treated a growth substrate...