Lateral root development differs between main and secondary roots and depends on the ecotype

PEROTTI, MARÍA FLORENCIA; ARIEL, FEDERICO DAMIÁN; CHAN, RAQUEL LÍA

Plant Signaling & Behavior

Taylor & Francis

Año: 2020 vol. 15

Root architecture depends on the development of the main root and also on the number and density oflateral roots. Most molecular knowledge about the development of lateral roots was acquired studyingprimary roots, and it was implied that high order roots follow the same pattern. Recently, we informedthat AtHB23 is differentially regulated in primary and secondary roots. Here we show that LBD16, a targetof AtHB23, also is differentially regulated; it is expressed in the tip of secondary and tertiary roots butnot in primary ones. Moreover, the key hormone auxin exhibits a different distribution pattern insecondary and tertiary roots, according to the reporter DR5. Finally, we show that in Col 0 and Lerecotypes development of secondary and tertiary roots exhibits significant variations. Altogether, we canconclude that different genetic programs govern secondary and tertiary roots development and suchprocesses are dependent on the Arabidopsis genotype.