| Blue-light reception in plants leads to phototropic plant movement, chloroplast relocation, and opening of stomatal guard cells. |
| It has cyto-protective and immunomodulating properties which guard cells from noxious chemicals and other stimuli. |
| Even in the late stages of leaf senescence, the chloroplasts of guard cells remain green and functional. |
| Stromules tend to be relatively rare in cell types such as mesophyll or guard cells that contain large chloroplasts. |
| The blue light response of guard cells is mediated by the chloroplastic carotenoid, zeaxanthin. |
| Both Z and phototropin have been implicated as blue light photoreceptors of guard cells. |
