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| Hauptseite > Publikationsdatenbank > Functional Implications of Root Cortical Senescence For Soil Resource Capture |
| Hauptseite > Publikationsdatenbank > Functional Implications of Root Cortical Senescence For Soil Resource Capture |
| Dissertation / PhD Thesis | FZJ-2018-06893 |
2017
Pennsylvania State University
State College
Abstract: Root phenes play a primary role in plant adaptation to edaphic stress. The identificationand understanding of the functional implications of root phenes may enable breeding and thedevelopment of crop varieties with improved soil resource acquisition. Root cortical senescence(RCS) is a type of programmed cell death in cortical cells of several Triticeae species. Untilrecently there has been very little attention as to the functional implications of RCS for water andnutrient capture.My research used physiology studies in the laboratory, greenhouse, and field and in silicoexperiments to characterize the development of RCS and understand its adaptive value and geneticcontrol. This dissertation explores the functional implications of RCS for water and nutrientcapture including its effects on root respiration and radial water and nutrient transport. Simulationresults suggest that RCS improves plant growth in edaphic stress conditions. Empiricalexperiments demonstrated its development of RCS is modulated by ethylene. RCS may be a usefultrait for water and nutrient acquisition, particularly in edaphic stress conditions.RCS may be an adaptive trait for nutrient acquisition by reallocating nutrients fromsenescing tissue and secondarily by reducing root respiration. As RCS progresses, less metabolicresources need to be invested in cortical maintenance, which could permit greater resourceallocation to the growth of shoots, other roots, and reproduction. These results suggest that RCSmerits investigation as a breeding target for enhanced soil resource acquisition and edaphic stresstolerance. The development of crops with enhanced soil resource acquisition would impact globalagriculture, since merits of RCS may be analogous to other species which also form RCS includingwheat, oats, and triticale.
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