Journal
ANNALS OF BOTANY
Volume 124, Issue 7, Pages 1227-1242Publisher
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcz135
Keywords
Arabidopsis; ATP; calcium; DORN1; P2K1; reactive oxygen species; root; wave
Categories
Funding
- UK Biotechnology and Biological Sciences Research Council (BBSRC) [BB/J014540/1]
- BBSRC [BB/S004637/1]
- US National Science Foundation [1826803]
- ANR
- Jiangsu Normal University
- Science and Engineering Research Board (India)
- University of Cambridge Commonwealth, European and International Trust
- University of Cambridge Broodbank Trust
- Yayasan DayaDiri
- National Institute of General Medical Sciences of the National Institutes of Health [R01GM121445]
- Next-Generation BioGreen 21 Program Systems and Synthetic Agrobiotech Center, Rural Development Administration, Republic of Korea [PJ01116604]
- BBSRC [BB/S004637/1] Funding Source: UKRI
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1826803] Funding Source: National Science Foundation
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Background and Aims Extracellular ATP governs a range of plant functions, including cell viability, adaptation and cross-kingdom interactions. Key functions of extracellular ATP in leaves and roots may involve an increase in cytosolic free calcium as a second messenger ('calcium signature'). The main aim here was to determine to what extent leaf and root calcium responses require the DORN1/P2K1 extracellular ATP receptor in Arabidopsis thaliana. The second aim was to test whether extracellular ATP can generate a calcium wave in the root. Methods Leaf and root responses to extracellular ATP were reviewed for their possible links to calcium signalling and DORN1/P2K1. Leaves and roots of wild type and dorn1 plants were tested for cytosolic calcium increase in response to ATP, using aequorin. The spatial abundance of DORN1/P2K1 in the root was estimated using green fluorescent protein. Wild type roots expressing GCaMP3 were used to determine the spatial variation of cytosolic calcium increase in response to extracellular ATP. Key Results Leaf and root ATP-induced calcium signatures differed markedly. The leaf signature was only partially dependent on DORN1/P2K1, while the root signature was fully dependent. The distribution of DORN1/P2K1 in the root supports a key role in the generation of the apical calcium signature. Root apical and sub-apical calcium signatures may operate independently of each other but an apical calcium increase can drive a sub-apical increase, consistent with a calcium wave. Conclusion DORN1 could underpin several calcium-related responses but it may not be the only receptor for extracellular ATP in Arabidopsis. The root has the capacity for a calcium wave, triggered by extracellular ATP at the apex.
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