Changes in Root Tips of Wheat and Corn Grown in Nutrient Solutions Deficient in Calcium

Effects on Zea mays Seedlings of a Strontium Replacement for Calcium in Nutrient Media

“…This was surprising, in that roots in Na ceased growing, while those in Sr, with less Ca45 in the tips, continued to elongate. The autoradiograms, with the observations on root growth, verify an earlier observation of Bamford (1), that roots normally need a continued external Ca supply for growth and development. They also confirm earlier observations that the mobility of Ca within deficient plants is very low, and that Ca, once bound, does not readily become redistributed (7).…”

Calcium Activation of Orthophosphate Absorption by Barley Roots

“…Other alkaline earth cations do not completely substitute for calcium in fulfilling this growth requirement ( 1,8).…”

“…Calcium, an essential element for plant growth, is involved in a wide spectrum of events including development of the meristematic regions (1) and absorption rates of other ions (3,7). Other alkaline earth cations do not completely substitute for calcium in fulfilling this growth requirement ( 1,8).…”

Studies on Submicroscopic Aspects of Mineral Deficiencies. I. Calcium Deficiency in the Shoot Apex of Barley

“…Studies have been carried out on various tissues and a diversity of anatomical and cytological changes have been recorded for a few deficiencies that result in rather striking effects (Ca, B, Mg). Amongst others, one may mention the work of Sorokin andSommer (1929, 1940), Bamford (1931), McMurtrey (1932), Lutman (1934), Gauch (1940), Haynes and Robbins (1948), Davis (1949), Venning (1954), Kalra (1956), and Spurr (1959). Important as these investigations are, it is clear that the degree of resolution obtained with the light microscope considerably limits the detail by which events in the cell can be accurately described.…”