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Einfluß von P‐Mangel im split‐root‐System auf lipoide Eigenschaften der Rapswurzel ( Brassica napus L.)
Author(s) -
Diepenbrock W.,
Geisler G.
Publication year - 1986
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1986.tb00012.x
Subject(s) - brassica , root system , saturation (graph theory) , chemistry , linolenic acid , linoleic acid , horticulture , fatty acid , botany , biology , zoology , biochemistry , mathematics , combinatorics
Effect of P‐deficiency in the split‐root‐system on lipoid root characteristics of rape‐seed ( Brassica napus L.) The effect of partial P‐deficiency on characteristics of parts of the root system from rape‐seed ( Brassica napus L.) was investigated by means of the split‐root‐technique. At 1 cm length of the seventh leaf treatments started lasting 21 days. Pots were designed with two separated chambers filled up with nutrient solutions. Both halfs of the root system lacked of P (‐/‐) or were fully fed (+/+). Additionally, one part of the root system was fully supplied while the other part was kept without P (+/‐). The root system grown at partial P‐supply revealed compensatory reactions which became evident by increased uptake of K and Ca and by higher contents and amounts of lipid‐P as compared to the P‐deficient root portion. The fatty acid composition of the major phospholipids from root tissue, phosphatidyl choline (PC) and phosphatidyl ethanolamine (PE), varied in dependence of P‐nutrition. At P‐deficiency the linoleic acid content (% 18:2) declined while the linolenic acid content (% 18:3) increased. Consequently, no change in saturation occurred. However, in PE the degree of saturation was affected distinctly. P‐deficiency caused an increase of saturation whereas full supply led to higher desaturation. The results point to relations between the intensity of nutrient uptake modulated by P‐nutrition and the amounts and characteristics of membrane lipids in root tissue.