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1997 | OriginalPaper | Buchkapitel

Einfluss Vorübergehender Bodentrockenheit auf Wachstum und Nährstoffaneignungsvermögen von Mais

verfasst von : Ž. Buljovčić, C. Engels, H. Marschner

Erschienen in: Rhizosphärenprozesse, Umweltstreß und Ökosystemstabilität

Verlag: Vieweg+Teubner Verlag

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The aim of the presented experiments was to determine the ability of corn roots to take up nutrients after drought and during recovery after rewatering of the soil and to examine root characteristics which possibly limit nutrient uptake under these conditions. Two different experimental approaches were used: 1.In a split root experiment only one part of the root system was droughted and the other part was kept wet to maintain water and nutrient demand in the shoot.2.In order to investigate effects under severe drought stress the whole root system in the soil was allowed to dry out for 10 days and was subsequently rewetted.In the split root experiment neither the shoot or root growth nor the ability to take up 15N-nitrate after a drought period of 4 days (6 weight% soil water content) was impaired.In the second experimental system, the roots of control plants which were watered continuously, took up 15N-nitrate immediately after 15N application, and 15N in the shoot was already detected 24 h later. In severely stressed plants 15N-nitrate was also found in the roots after 24 h but in contrast to the split root experiments there was no translocation into the shoot within the first 4 days. Obviously after severe drought stress the ability of the roots to take up nutrients and particularly to translocate 15N into the shoot, was severly decreased. Under these conditions it seems that nutrient uptake in the roots and translocation into the shoot is limited by a low nutrient demand of the shoot but also due to impaired hydraulic conductivity of the roots and reduced root pressure.After severe drought stress root growth recovered within one day after rewetting. This new root growth may have contributed to the recovery of hydraulic conductivity of the root system and thus to translocation of 15N into the shoot.

Metadaten
Titel
Einfluss Vorübergehender Bodentrockenheit auf Wachstum und Nährstoffaneignungsvermögen von Mais
verfasst von
Ž. Buljovčić
C. Engels
H. Marschner
Copyright-Jahr
1997
Verlag
Vieweg+Teubner Verlag
DOI
https://doi.org/10.1007/978-3-322-83429-4_19