Year: 1973
Type: article
Abstract: In order to investigate the effect of iron concentration in the nutrient solution on zinc toxicities of vegetable crops, welsh onion, spinach, bean, and cucumber were grown in solution culture with varying zinc and iron levels. Hoagland′s No. 1 solution was used as the basic nutrient solution. The concentrations of zinc supplied were 0.05, 1, 3, 10, and 30ppm. At each of the zinc level iron was supplied at rates of 1, 3, 10 (or 9), and 30ppm. Iron chelate (Fe-EDTA) was used as the iron source. All of the solutions were adjusted to pH 6.1. At the 1 and 3ppm iron levels, plants treated with excess zinc revealed interveinalc hlorosis in upper leaves. The symptom became more progressively severe with decrease of the iron supply and with increase of the zinc supply; and in the severe case plants were entirely chlorotic and showed markedly inhibited growth.2. The increase of iron supply in the solution was markedly effective to prevent the development of the chlorosis and to reduce the inhibition of growth, provided the zinc level was not too high. Normal growth was obtained when the ratio of iron to zinc in the solution was in the optimal range, from 1 to 3 or more, depending on the zinc level in the solution. It was also suggested that the excessive iron supply might cause iron toxicities.3. Although the chlorosis observed was considered to be zinc-induced iron chlorosis, there was no evident relation between the development of the chlorosis and the iron content in leaves in most case. However, the ratio of iron to zinc or to zinc plus manganese within leaves was definitely low with plants which showed chlorosis or inhibited growth due to zinc toxicities.4. The increase of iron supply in the solution had also the effect to suppress the excessive accumulation of zinc in the plants.
DOI: 10.2503/jjshs.42.259
Author: Takaya OSAWA
Institution: Osaka Prefecture University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W4250684232