Abstract
SummaryLegumes grow specialized root nodules that are distinct from lateral roots in morphology and function, with nodules intracellularly hosting beneficial nitrogen-fixing bacteria that provide the plant with a nitrogen source. We have previously shown that a lateral root-like program underpins nodule initiation, but there must be additional developmental programs that confer nodule identity. Here, we show that two members of theLIGHT SENSITIVE SHORT HYPOCOTYL (LSH)transcription factor family, predominantly known to define organ boundaries and meristem complexity in the shoot, function as regulators of nodule organ identity.LSH1/LSH2function upstream of and together with the known nodule regulatorsNuclear Factor Y-A1andNODULE ROOT1/2.The principal outcome ofLSH1/LSH2function is the production of cells able to accommodate nitrogen-fixing bacteria, the unique nodule feature. We conclude that the coordinate recruitment of a pre-existing primordium identity program, in parallel to a root initiation program, underpins the divergence between lateral roots and nodules.
Publisher
Cold Spring Harbor Laboratory
Cited by
8 articles.
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