EFFECT OF MANGANESE DEFICIENCY UPON THE HISTOLOGY OF LYCOPERSICUM ESCULENTUM

Photosynthetic and Chloroplast Ultrastructural Consequences of Manganese Deficiency in Soybean

“…A reduction in quantity of chloroplasts, number of lamellar membranes, and starch within deficient plants is morphological evidence of reduced photosynthetic activity. A reduction in starch content as observed in this study seems to be one of the earliest symptoms of Mn deficiency and supports findings of Eltinge (1941); Vesk, Possingham, and Mercer (1966); and Cheniae and Martin (1968). Since chlorophyll content is not a true indication of photosynthesis with no obligatory linear relationship (Ruck and Bolas, 1954;Cooper and Girton, 1963;Crang and Noble, 1974), low photosynthetic rates may be a consequence of the absence of Mn, which is known to participate in the 02-evolving step of the light reaction (Kessler, 1955;Eyster et al, 1958;Cheniae and Martin, 1967;Heath and Hind, 1969) rather than a decrease in chlorophyll content.…”

Histological Structure of Potato Stems and Leaves as Influenced by Manganese Toxicity

“…This would account for the collapse of cells giving the brown longitudinal streaks formed on the stem. KELLEY (4) and ELTINGE (3) reported' that excess manganese and manganese deficiency had similar effects on the cell content of the leaves. The chloroplasts were the first part of the plant to be affected by either an excess or lack of this element.…”