Cytokinin functions as an asymmetric and anti-gravitropic signal in lateral roots.,Nature Communications

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Cytokinin functions as an asymmetric and anti-gravitropic signal in lateral roots.
Nature Communications ( IF 14.7 ) Pub Date : 2019-08-06 , DOI: 10.1038/s41467-019-11483-4
Sascha Waidmann ₁ , Michel Ruiz Rosquete ₁ , Maria Schöller ₁ , Elizabeth Sarkel ₁ , Heike Lindner ₂ , Therese LaRue _{2,

3} , Ivan Petřík ₄ , Kai Dünser ₁ , Shanice Martopawiro ₅ , Rashmi Sasidharan ₅ , Ondrej Novak ₄ , Krzysztof Wabnik ₆ , José R Dinneny _{2,

3} , Jürgen Kleine-Vehn ₁

Affiliation

Directional organ growth allows the plant root system to strategically cover its surroundings. Intercellular auxin transport is aligned with the gravity vector in the primary root tips, facilitating downward organ bending at the lower root flank. Here we show that cytokinin signaling functions as a lateral root specific anti-gravitropic component, promoting the radial distribution of the root system. We performed a genome-wide association study and reveal that signal peptide processing of Cytokinin Oxidase 2 (CKX2) affects its enzymatic activity and, thereby, determines the degradation of cytokinins in natural Arabidopsis thaliana accessions. Cytokinin signaling interferes with growth at the upper lateral root flank and thereby prevents downward bending. Our interdisciplinary approach proposes that two phytohormonal cues at opposite organ flanks counterbalance each other's negative impact on growth, suppressing organ growth towards gravity and allow for radial expansion of the root system.

中文翻译：

细胞分裂素在侧根中起不对称和反重力信号的作用。

定向器官生长允许植物根系战略性地覆盖其周围环境。细胞间生长素运输与初级根尖中的重力矢量对齐，有助于在下根侧向下器官弯曲。在这里，我们表明细胞分裂素信号作为侧根特异性抗重力成分发挥作用，促进根系的径向分布。我们进行了全基因组关联研究，发现细胞分裂素氧化酶 2 (CKX2) 的信号肽加工会影响其酶活性，从而决定天然拟南芥种质中细胞分裂素的降解。细胞分裂素信号会干扰上侧根侧面的生长，从而防止向下弯曲。

更新日期：2019-08-06

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