P-Campus-Ringvorlesung am 05.10.2023
Am 5. Oktober findet der nächste Vortrag der P-Campus-Ringvorlesung 2023 statt. Dr. Maire Holz vom Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) spricht über "Root and Rhizosphere traits for soil P mobilization".
Der Vortrag wird online per Webex übertragen und beginnt um 15:00 Uhr.
Abstract
Rice serves as a fundamental dietary staple for over half of the global population. Especially in upland agricultural systems, its growth faces frequent challenges due to low phosphorus (P) availability, stemming from P-fixing soils and a scarcity of P fertilizers. Consequently, it is vital to comprehend the processes responsible for achieving high Phosphorus acquisition efficiency (PAE) to ensure sustainable crop yields in low-input farming systems. Previous research has indicated that varying PAE among upland rice varieties cannot be solely attributed to root morphological parameters (such as root system size and root hairs) or root physiology (P depletion efficiency). Therefore, we propose that biogeochemical processes occurring at the root-soil interface, known as the rhizosphere, play a pivotal role in rice PAE.
In this lecture, we will present findings related to the significance and interactions of biogeochemical processes in the rhizosphere of diverse rice genotypes exhibiting differing PAE characteristics. Our investigation involves assessing the capacity of distinct rice genotypes to acquire phosphorus from both fertilizer sources and native soil sources. Additionally, we evaluate various soil phosphorus fractions using a Hedley sequential fractionation method. To deepen our understanding of the processes underlying enhanced PAE in these rice genotypes, we conducted a separate pot experiment to analyze the quantity and composition of root exudates, with the results to be shared.
Furthermore, we will introduce a methodological innovation that enables the tracking and quantification of 33P uptake from specific root regions over time. This pioneering approach empowers future research endeavors, facilitating the quantification of 33P uptake from diverse root regions and types across varying plant growth conditions. It also aids in the assessment of the importance of different phosphorus sources for plant nutrition, ultimately advancing our models of plant phosphorus uptake from the soil.
Collectively, the results we present aim to shed light on the rhizosphere processes responsible for high P acquisition efficiency in upland rice. This knowledge will enable the integration of rhizosphere traits into breeding programs for upland rice varieties and enhance the selection of crops with exceptionally efficient phosphorus acquisition, thereby ensuring robust yields in low-input agricultural systems.