early in the season were less legetative than thobe taken in August and September. The light intensity and light duration to completely keep the standard cultivars vegetatile is 10 to 20 foot-candles for one hour in the middle of the night. A recent experiment on ‘Paul Mikkelsen’ grown at 70’ F revealed that lighting for four hours (10 p.m. to 2 a.m.) with a minimum of 10 foot-candles is necess...

Hydroponic culture solutions containing bicarbonate (HCO3 ) may be used to screen crops such as soybeans (Glycine max) for resistance to iron (Fe) deficiency or chlorosis. Some successful methods use sodium bicarbonate (NaHCO3) in combination with elevated partial pressures of carbon dioxide (CO2) to buffer pH and elevate bicarbonate. Replacing NaHCO3 with magnesium bicarbonate [Mg(HCO3)2] as t...

Experiments were conducted on Nicotiana tabacum, L. to study the relation in the grana among chlorophylls, carotenoids, and proteins. The effect of iron chlorosis on protein and pigment synthesis was studied at different stages of chlorosis using glycine-U-C(14). Pigments were separated by thin layer chromatography.Chlorophyll a, chlorophyll b, carotenoid, and protein contents of chloroplasts f...

For nearly four centuries a disease known as chlorosis, the green sickness or the virgin's disease, was commonly recognised. There are many references to it in literature and art from the sixteenth to the nineteenth centuries' -3 and numerous clinical descriptions by physicians. Until the middle of the nineteenth century there was, however, no general agreement on the cause of the disease; then...

4. BROW-N, J. C., R. S. HOLMES, AND L. 0. TIFFIN. 1958. Iron chlorosis in soybeans as related to the genotype of rootstock. Soil Sci. 86: 75-82. 5. DEKOCK, P. C. AND R. J. MORRISON. 1958. The metabolism of chlorotic leaves. 2. Organ.c acids. Biochem. J. 70: 272-77. 6. DICKMAN, S. R. AND A. A. CLOUTIER. 1951. Factors affecting the activity of aconitase. J. Biol. Chem. 188: 379-88. 7. ILJIN, WV. ...

Variegation of leaves is found widely distributed in the genera of the plant kingdom. Many forms are of great intrinsic beauty and are therefore a common feature in estates and gardens. The chlorotic areas usually appear as pale edges of varying width and regularity around and overlying an otherwise apparently normal green leaf, but very often whole leafy branches may appear colourless while ot...