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The maize lilliputian1 (lil1) gene, encoding a Brassinosteroid cytochrome P450 C-6 oxidase, is involved in plant growth and drought response

Annals of Botany 122: 227–238, 2018

Authors: Giulia Castorina*, Martina Persico*, Massimo Zilio, Stefano Sangiorgio, Laura Carabelli and Gabriella Consonni

* Both authors contributed equally to this wor

The inset cover image of the August issue of the Annals of Botany Journal shows an image from the work of Castorina et al., in whicha detailed analysis of lil1-1, a mutant impaired in the last steps of the Brassinosteroids (BR) pathway, is presented.

The image shows at the top a schematic representation of the maize cytochrome P450 CYP85A1 C-6 oxidase gene structure. The lil1-1 mutant allele carries a Mutator1 insertion, indicated as a triangle. At the bottom 10-day old wild-type (back), homozygous lil1-1 and homozygous brd1-m1 (front) seedlings are shown.

Lack of BR active molecules causes a drastic reduction in seedling elongation, affects root gravitropic curvature and alters cell density on leaf epidermis. Moreover, mutants show a decrease in leaf permeability and a better adaptation to water scarcity condition, if compared to wild type seedlings. This is the first report of BRs regulating plant response to drought in Zea mays.

06 September 2018
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