ISSN:
1573-5036
Keywords:
iron
;
mineral deficiency
;
mitochondrial electron transport
;
NADH
;
Oryza sativa
;
proline
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The concentration of proline in shoots of rice (Oryza sativa) seedlings raised in distilled water was about 3.3 times higher than in the seedlings raised in modified B5 medium. The shoots of seedlings raised in B5 medium which was depleted of calcium, iron, magnesium or potassium had a higher concentration of proline than those grown in standard B5 medium. The shoots of seedlings raised in distilled water with iron had a lower level of proline than those in distilled water. These results suggest that iron deficiency leads to high proline accumulation. The electron transport activity of mitochondria from shoots of etiolated seedlings raised in distilled water or iron-depleted B5 medium was significantly lower than those from equivalent seedlings raised with an iron source. As suppression in mitochondrial electron transport leads to an increase in NADH/NAD+ ratio, we propose that the prime cause of the proline accumulation during iron deficiency is to readily maintain NADH/NAD+ ratio.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00025084
