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Plants 2018, 7(4), 107;

Stress-Triggered Long-Distance Communication Leads to Phenotypic Plasticity: The Case of the Early Root Protoxylem Maturation Induced by Leaf Wounding in Arabidopsis

Department of Science, University “Roma Tre”, 00146 Rome, Italy
Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy
Author to whom correspondence should be addressed.
Received: 26 October 2018 / Revised: 28 November 2018 / Accepted: 30 November 2018 / Published: 4 December 2018
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Root architecture and xylem phenotypic plasticity influence crop productivity by affecting water and nutrient uptake, especially under those environmental stress, which limit water supply or imply excessive water losses. Xylem maturation depends on coordinated events of cell wall lignification and developmental programmed cell death (PCD), which could both be triggered by developmental- and/or stress-driven hydrogen peroxide (H2O2) production. Here, the effect of wounding of the cotyledonary leaf on root protoxylem maturation was explored in Arabidopsis thaliana by analysis under Laser Scanning Confocal Microscope (LSCM). Leaf wounding induced early root protoxylem maturation within 3 days from the injury, as after this time protoxylem position was found closer to the tip. The effect of leaf wounding on protoxylem maturation was independent from root growth or meristem size, that did not change after wounding. A strong H2O2 accumulation was detected in root protoxylem 6 h after leaf wounding. Furthermore, the H2O2 trap N,N1-dimethylthiourea (DMTU) reversed wound-induced early protoxylem maturation, confirming the need for H2O2 production in this signaling pathway. View Full-Text
Keywords: wounding; root plasticity; hydrogen peroxide; protoxylem wounding; root plasticity; hydrogen peroxide; protoxylem

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Fraudentali, I.; Rodrigues-Pousada, R.A.; Volpini, A.; Tavladoraki, P.; Angelini, R.; Cona, A. Stress-Triggered Long-Distance Communication Leads to Phenotypic Plasticity: The Case of the Early Root Protoxylem Maturation Induced by Leaf Wounding in Arabidopsis. Plants 2018, 7, 107.

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