Preliminary Results obtained with an Apparatus for the Study of Salt Uptake and Root Respiration of Whole Plants

The Respiration of Barley Plants

“…The more limited observations on roots treated with hydroxylamine indicate that its action may be complicated by secondary toxic effects, although there is some evidence of a primary increase in the rate of respiration. These results are consistent with those of Hoagland (1944), Woodford & Gregory (1948) and of Humphries (1951), who studied the effects of nitrate on barley roots, while Hamner (1936), Postma (1939), Gilbert & Shive (1945) and others have shown similar nitrate effects with other species. Hamner (1936) has demonstrated a rapid increase in carbon dioxide production in wheat and tomato on the addition of nitrate, and analysis of his results suggests that there is at first a greater respiratory increase in the root than in the shoot.…”

Studies on the Transport of Oxygen Through the Stems and Roots of Vegetable Seedlings

“…However, the surface of the solutions were exposed to air, and in the present work, it was found that substantial amounts of oxygen could be transported by convection currents. Woodford and Gregory (1948) found that barley grew readily in an oxygen-free medium provided the nutrient Table 3. Oxygen transport through compost-grown seedlings * That is, distance of tip of leaves to base of stem plus distance along the root from the base of stem to electrode tip.…”

Interactions in the Absorption of Ammonium, Potassium, and Sodium Ions by Wheat Roots

“…The grids were placed on 800 ml glass beakers filled with 500 ml culture solution, the level being just below the grid. The nutrient solution (chemicals from B.D.H., quality "Analar", dissolved in distilled water) was the same as that used by WOODFORD and GREGORY (1948) The solution was completed by the addition of Fe (10 mg/l culture solution, as the ferric complex of sequestric acid), of micronutrients (A-Z solution according to HOAGLAND and SNYDER, 1933, 1 mljl culture solution) and of Mo (0.2 mg/l culture solution, as ammonium molybdate) . The units of 50 plants were held in the dark for 72 hours.…”