向日葵不定根的研究——向日葵不定根的形态结构

MORPHOLOGICAL STRUCTURE OF ADVENTITIOUS ROOTS OF SUNFLOWER

向日葵除了由种子的胚根长成的主根及其侧根外,还能够自胚轴处再长出不定根。到开花期不定根总量已超过自主根上发出的侧根的重量,以后还在继续增加。向日葵的主根及其侧根的初生结构为典型的4原型,导管发育较迟,而不定根则为6原型,主要是受到胚轴结构的影响,根与胚轴的结构很协调。从不定根的结构特点导致吸收功能等较主根侧根强盛,表现出结构与功能的一致性。

Besides the principal root and lateral roots generated from the radicle of seed ,considerable adventitious roots could generate from the hypocotvi of sunflower.Up to the flowering stage,the total amount of the adventitious roots exceeded that of the lateral roots in the principal root,The adventitious roots would continue to increase after the flowering stage.The initial structure of principal root and lateral roots was of typical tetrach,and the development of the vessel was quite slow,But the adventitious roots were heaxrch The structure of adventitious roots made their capacity of absorption stronger than the lateral roots