Mineral Uptake

Dakora & Phillips: Root exudates (2002)

Rengel: Genetic control of root exudation (2002)

Crop Science 7(1): 53-55 (1966)
Relative Importance of Stem and Root in Determining Genotypic Differences
in Sr-89 and Ca-45 Accumulation in Soybeans (Glycine max L.)

R. A. Kleese

Stem grafts were made among 8 to 10-day-old soybean plants to ascertain the role of stem and root in determining varietal differences in accumulation of Sr-89 and Ca-45 in seed and in the terminal portion of the stem. The effect of the graft per se was negligible as evidenced by similar Sr-89 and Ca-45 accumulation in grafted plants with stem and root of identical genotype and the ungrafted plants of the same genotype. Accumulation of Sr-89 and Ca-45 in seeds was largely controlled by the genotype of the stem. In the terminal 12 to 15 cm of the stem Sr-89 and Ca-45 accumulation was controlled by both stem and root, with the stem being relatively more important.

Transport in Plants vol. 2. part 1. pp 372-393 (1976)
9. Genotypic Variation in Transport
A. Läuchli

Ecologists have recognized for a long time that nature has confronted them with a great number of natural examples where plants are adapted to different nutrient regimes. For instance, mangroves growing in sea water can be contrasted with trees on the non-saline land next to them. The question arises as to why mangroves grow in sea water, and why do they not live further inland in the community of the less salt-tolerant tree species? A second example is given by the strikingly different floras on calcareous and acid soils, respectively. Why are there species which thrive on soils rich in lime and high in pH, whereas others occur only on acid soils low in Ca2+ and pH? Thirdly, serpentine soils bear a sparse yet characteristic flora. These soils are high in Mg2+ and certain heavy metals but contain little Ca2+. Why, on the one hand, is there such a characteristic serpentine flora, and why, on the other hand, are most species not able to exist on serpentine soils? Many more such examples could be added. All of them have in common that their existence follows from variation in the genotype of plants and from adaptation during the course of evolution.

Local Endemics