初生根的形态解剖结构与春小麦抗旱性的关系初探

生长在半干旱条件下的春小麦，如果其初生根数目较少或者种子根后生木质部的中央大导管的直径较小，就可以提高作物对有限水分吸收的抵抗力，从而提高作物群体的抗旱能力。这是其形态解剖结结构对水分胁迫的一种适应。

A Preliminary Study of the Relation Between the Drought Resistance of Different Spring Wheat Varieties and Anatomical Structure of Root

When spring wheat is growing under the semi arid condition, the smaller diameter of the main xylem vessel in the seminal axes or the less number of seminal axes can increase the resistance of the root to absorb the limited water in the soil, thus increasing the ability of crop population to resist the water stress. So, each of the two can be used as a kind of index for characterizing the drought resistance. By using the cryostat microtome, the anatomical structures of the seminal root of five spring wheat varieties from Longzhong region, Gansu have been investigated, and their abilities for drought resistance analyzed.