In a study published in Nature Plants, a research team led by Prof. Chao Daiyin from the Center of Excellence for Molecular Plant Sciences of the Chinese Academy of Sciences identified a novel protein family in plants named as GAPLESS, and revealed that members of this family mediate the adhesion between the cell wall and the plasma membrane at the Casparian strip (CS), a barrier in the root endodermis. This adhesion plays a critical role in controlling nutrient transport and the growth development of rice.
is incredibly strong and cannot even be separated by high osmotic treatments that tear cells apart. This adhesion has been speculated to play an important role in plants. Due to the difficulty of research and lack of evidence, this speculation has not been confirmed, and theIn this study, the researchers first identified a series of genes specifically expressed in the root endodermis of rice through bioinformatics analysis.
Subsequent research showed that the barrier function of the root endodermis of the single mutant gapless1 to prevent the free diffusion of water-soluble molecules decreased, while that in the double mutant gapless1/2 was even more severely impaired. However, further investigation revealed that their CS lignin accumulation was not defective; instead, the CS in the gapless1/2 double mutant was wider and stronger. This suggested that their barrier defects are not caused by CS defects.
Further investigation revealed that the GAPLESS proteins are specifically localized in CS and close to the OsCASP1 protein, which is specifically localized in the CSD. A series of experimental evidence showed that the GAPLESS protein can strongly interact with OsCASP1, forming a robust GAPLESS-OsCASP complex.
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