Genome-Wide Transcriptome Analysis Reveals That Upregulated Expression of <i>Aux</i>/<i>IAA</i> Genes Is Associated with Defective Leaf Growth of the <i>slf</i> Mutant in Eggplant
Wenchao Du | Yang Lu | Shuangxia Luo | Ping Yu | Jiajia Shen | Xing Wang | Shuxin Xuan | Yanhua Wang | Jianjun Zhao | Na Li | Xueping Chen | Shuxing Shen
Leaf size is a crucial trait in eggplant breeding, as it influences photosynthesis, plant biomass and management. However, little is known about the molecular mechanism regulating leaf size in eggplant. This study reports a small leaf mutant (<i>slf</i>) generated with the mutagen ethyl methane sulfonate (EMS). The <i>slf</i> mutant showed restricted cell proliferation and an increased content of auxin. Transcriptome analysis revealed that several genes involved in auxin signaling are upregulated in <i>slf</i>. Exogenous application of auxinole, an auxin antagonist of TIR1/AFB receptors, repressed the expression of these genes and restored leaf growth of <i>slf</i>, suggesting that the small leaf size of <i>slf</i> is likely associated with auxin signaling. This study provides essential clues to unveil the molecular mechanism of leaf size regulation in eggplant.
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