Article
Aug 1, 2022
A PLETHORA/PIN-FORMED/auxin network mediates prehaustorium formation in the parasitic plant Striga hermonthica
Plant Physiology
Authors:
Ting Ting Xiao, Gwendolyn K Kirschner, Boubacar A Kountche, Muhammad Jamil, Maria Savina, Vinicius Lube, Victoria Mironova, Salim al Babili, Ikram Blilou
Enjoyed this publication? Share it!
Abstract
The parasitic plant Striga (Striga hermonthica) invades the host root through the formation of a haustorium and has detrimental impacts on cereal crops. The haustorium results from the prehaustorium, which is derived directly from the differentiation of the Striga radicle. The molecular mechanisms leading to radicle differentiation shortly after germination remain unclear. In this study, we determined the developmental programs that regulate terminal prehaustorium formation in S. hermonthica at cellular resolution. We showed that shortly after germination, cells in the root meristem undergo multiplanar divisions. During growth, the meristematic activity declines and associates with reduced expression of the stem cell regulator PLETHORA1 and the cell cycle genes CYCLINB1 and HISTONE H4. We also observed a basal localization of the PIN-FORMED (PIN) proteins and a decrease in auxin levels in the meristem. Using the structural layout of the root meristem and the polarity of outer-membrane PIN proteins, we constructed a mathematical model of auxin transport that explains the auxin distribution patterns observed during S. hermonthica root growth. Our results reveal a fundamental molecular and cellular framework governing the switch of S. hermonthica roots to form the invasive prehaustoria.
Bibliography
Ting Ting Xiao, Gwendolyn K Kirschner, Boubacar A Kountche, Muhammad Jamil, Maria Savina, Vinicius Lube, Victoria Mironova, Salim al Babili, Ikram Blilou, A PLETHORA/PIN-FORMED/auxin network mediates prehaustorium formation in the parasitic plant Striga hermonthica, Plant Physiology, Volume 189, Issue 4, August 2022, Pages 2281–2297, https://doi.org/10.1093/plphys/kiac215