Anatomical and hormonal description of rootlet primordium development along white lupin cluster root

Physiologia Plantarum
Cécilia GallardoBenjamin Péret

Abstract

Cluster root (CR) is one of the most spectacular plant developmental adaptations to hostile environment. It can be found in a few species from a dozen botanical families, including white lupin (Lupinus albus) in the Fabaceae family. These amazing structures are produced in phosphate-deprived conditions and are made of hundreds of short roots also known as rootlets. White lupin is the only crop bearing CRs and is considered as the model species for CR studies. However, little information is available on CRs atypical development, including the molecular events that trigger their formation. To provide insights on CR formation, we performed an anatomical and cellular description of rootlet development in white lupin. Starting with a classic histological approach, we described rootlet primordium development and defined eight developmental stages from rootlet initiation to their emergence. Due to the major role of hormones in the developmental program of root system, we next focussed on auxin-related mechanisms. We observed the establishment of an auxin maximum through rootlet development in transgenic roots expressing the DR5:GUS auxin reporter. Expression analysis of the main auxin-related genes [TIR, Auxin Response Factor (ARF) an...Continue Reading

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Citations

Jun 17, 2020·Physiologia Plantarum·Sanaz Rajabi-KhamsehMohammad Rafieiolhossaini
Feb 24, 2021·Plant Physiology and Biochemistry : PPB·Mabel DelgadoAriana Bertin-Benavides
Mar 23, 2021·Frontiers in Plant Science·José J PueyoM Mercedes Lucas
Jul 20, 2019·Trends in Plant Science·Bertrand MullerXavier Draye

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