Digitale Medien
Oxford, UK
:
Blackwell Publishing Ltd
Physiologia plantarum
61 (1984), S. 0
ISSN:
1399-3054
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
Notizen:
The absorption of nitrate, protein metabolism and the source of nitrogen for proline synthesis were studied in soybean (Glycine max L. cv. Akisengoku) with 15N tracer technique under water stress conditions. The absorption of nitrate was sensitive to water stress and the flow of nitrate into the leaves completely ceased under severe stress conditions. Net protein loss from the water-stressed leaves was attributable to both a decrease in synthetic activity and a stimulation of protein degradation. Proline and asparagine accumulated extensively in the severely water-stressed plant tissues, especially in the younger green leaves. Fifty four % of the loss of leaf protein-15N during the stress period was balanced by a gain in 15N in the free amino acids, 41% being found in proline and asparagine. The increase in 15N content of the free proline was 3 times greater than the decrease in 15N content of the protein-bound proline in the leaf. The results indicate that the accumulation of proline in response to water stress was caused by enhanced synthesis and that the nitrogen source for this proline is the leaf protein. The possible association of these findings with stress tolerance is discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1399-3054.1984.tb05180.x
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