向光性
嗜光蛋白
下胚轴
拟南芥
细胞生物学
生物
生长素
生物物理学
蓝光
突变体
化学
植物
物理
光电子学
基因
生物化学
作者
Ganesh M. Nawkar,Martina Legris,Anupama Goyal,Emanuel Schmid‐Siegert,Jérémy Fleury,Antonio Mucciolo,Damien De Bellis,Andreas Schüler,Christian Fankhauser
标识
DOI:10.1101/2023.02.22.529488
摘要
Summary In light-limiting conditions, aerial organs of most plants reorient their growth towards the light to improve photosynthesis, through a process known as phototropism 1-3 . The blue light receptors phototropin control phototropic responses through light-induced protein kinase activity 4 . Current models posit that asymmetric activation of these sensory receptors across a unilaterally illuminated organ leads to asymmetric distribution of the growth hormone auxin ultimately leading to growth re-orientation 4,5 . However, the tissue properties required to generate a light gradient across the stem triggering phototropism remain unclear 1 . Here we show that inter-cellular air channels 6,7 are required for an efficient phototropic response. These channels enhance light scattering (refraction and reflection) in Arabidopsis hypocotyls thereby enhancing the light gradient across the photo-stimulated organ. We identify an embryonically expressed ABC transporter that is required to keep air in inter-cellular spaces in seedlings and for efficient phototropism. Our work suggests that this transporter shapes cell wall properties to maintain air between cells. Moreover, we establish the functional importance of inter-cellular air channels in the hypocotyl for phototropism.
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