茉莉酸类与植物地下贮藏器官的形成

Possible Involvement of Jasmonates in the Morphogenesis of Underground Storage Organs in Plants

茉莉酸类化合物 (茉莉酸及其衍生物 )可能参与了马铃薯、薯蓣、菊芋的块茎 ,甘薯的块根以及洋葱、大蒜的鳞茎形成。JA及MeJA均可诱导离体条件下马铃薯块茎的形成和马铃薯髓部细胞的膨大。JA诱导细胞膨大是由于蔗糖积累导致渗透压增加以及细胞壁结构变化 ,从而使其伸展性增加 ,纤维素的合成起了重要作用 ,细胞骨架也是JA诱导细胞膨大所必需的。但迄今为止 。

Jasmonates (jasmonic acid and its derivatives) seem to be involved in the morphogenesis of underground storage organs in plants, such as tuberization (potato, yam, and Jerusalem artichoke), tuberous root formation (sweet potato), and bulb formation (onion and garlic). JA and MeJA can induce tuber formation in vitro and cells expansion of medullary tissue. JA_induced expansion of cells is attributable to both the increase of osmotic pressure due to the accumulation of sucrose and the changes in cell wall architecture that appears to affect extensibility of the wall. Moreover, the synthesis of cellulose and the involvement of microtubles (MTs) might be indispensable for JA_induced expansion. But so far we do not know what is the real trigger of potato tuberization. The exact nature of JAs_mediated morphogenesis of underground storage organs in plants remains to be elucidated.