Inflorescence stem cracking triggered by uncoordinated growth in Arabidopsis thaliana

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Badel, Eric | Asaoka, Mariko | Hamant, Olivier | Nishitani, Kazuhiko

Edité par CCSD -

International audience. In plants, mechanical integrity of organs requires coordinated growth because cells need to remain contiguous through their walls. Recently, we demonstrated that stem integrity in Arabidopsis thaliana relies on three additive mechanical components: the epidermis that resists inner cell growth, cell proliferation in inner tissues, and growth heterogeneity associated with vascular bundle distribution in deep tissues. More specifically, we found that the unbalanced growth of stem organ in the clavata3 de-etiolated3 mutant stretched epidermal cells, ultimately generating cracks in stems(1, 2). We also found another regulator of stem integrity, the transcription factor INDETERMINATE DOMAIN9 (IDD9), which triggers stem cracking when expressed as a dominant repressor version(3). This work reveals how multifactorial stem integrity is. Yet, we are still lacking for a comprehensive understanding of this research field. Here, we present a new mutant line that displays stem cracking during growth. Unlike the other lines mentioned above, this mutant showed no obvious defect on inner stem arrangement, except for thicker stems. We report the results of the analyses of mechanical properties and cell wall components of this line.

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