Aquaporins are postulated to be the main water transporter protein in plants. however their presence and expression may vary among plant species, tissues and time during development. in plants, aqps are present in almost all organs, including the roots, leaves, stems, flowers, fruits, seeds, dry seeds [ 60 ], pollen [ 13 , 61 , 62 , 63 ], anther and specific cells such as the guard cells [ 64 , 65 ].. Aquaporins are intrinsic membrane proteins present in the plasma membrane and most inner membranes of plants cells. while most aquaporins function as channels to facilitate transmembrane water transport, they can also transport small neutral molecules such as gases (co 2, ammonia), reactive oxygen species (hydrogen peroxide: h 2 o 2) and metalloids (boric acid, silicic acid, antimonite, arsenite) (kaldenhoff, 2012; bienert & chaumont, 2014; maurel et al., 2015)..
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