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本文报导了甜菜侧根和不定根的形成与结构。甜菜侧根原基常发生在成熟区的一般距离内.这段距离为侧根的发生区.它可随主根的伸长而逐渐向根端延伸。甜菜不定根初期发生在下胚轴和主根交界处,以后随着根、轴的增粗而向轴端延伸成两行。使根和下胚轴之间的界限难以分清.不定根原基在“块根”的初生水质部和初生韧皮部的夹角范围内的维管组织附近的薄壁细胞发生.和侧根一样属于内生源。还可能有“外生源”。可由木栓形成层附近的薄壁细胞发生。不定根和侧根的初生结构与主根一样属于“二原型”。有次生结构和三生结构。但其各组成部分的细胞数目较主根的少.不定根的三生结构不明显。侧根和不定根的维管组织与母根的相应部分连接成一整体。
This paper reports the formation and structure of lateral roots and adventitious roots in sugar beets. Beet root primordia often occur in the mature area within the general distance, which is the lateral root of the occurrence of the area.It can be with the main root elongation and gradually extended to the root end. Beet root adventitious roots occurred in the early hypocotyl and main root junction, with the root, the shaft thickening and extending to the shaft end into two rows. So that the root and hypocotyls boundaries difficult to distinguish adventitious root primordium in the “root” of the nascent water quality department and primary phloem angle range of vascular tissue near the parenchyma cells occur, and the same as the lateral roots of endogenous sources. There may also be “exogenous sources.” Possibly occurs by parenchyma cells near the cork formation layer. The primary structure of adventitious root and lateral root belongs to “two prototypes” like the main root. There are secondary structure and three structure. However, the number of cells in each component is less than that of the main roots.The structure of adventitious root is not obvious. Lateral root and adventitious root vascular organization and the corresponding part of the parent root connected as a whole.