DEVELOPMENT OF CASPARIAN BANDS AND SUBERIN LAMELLAE IN THE ENDODERMIS OF ONION ROOTS

被引:30
作者
BARNABAS, AD
PETERSON, CA
机构
[1] UNIV WATERLOO,DEPT BIOL,WATERLOO N2L 3G1,ONTARIO,CANADA
[2] UNIV DURBAN,DEPT BOT,DURBAN 4000,SOUTH AFRICA
来源
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE | 1992年 / 70卷 / 11期
关键词
CASPARIAN BAND; ENDODERMIS; SUBERIN LAMELLA; ALLIUM-CEPA;
D O I
10.1139/b92-276
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The endodermal Casparian band in onion (Allium cepa L.) roots is first evident 10 mm from the apex. It occupies a small region (20-30%) in the middle of the radial wall for a distance of 70 mm from the apex. However, with the development of suberin lamellae in most cells at greater distances from the root tip, the band expands symmetrically through the wall until, at 80 mm from the root tip, it fills the entire radial wall. Passage cells overlying some xylem poles have a delayed development of suberin lamellae, and in these cells the Casparian bands remain narrow. The sensitive stain, Fluorol yellow 088, detects precursors of the suberin lamellae in the outer tangential walls of the endodermal cells. The presence of complete lamellae is indicated by Sudan red 7B staining and resistance to acid digestion. Growth of the Casparian band during suberin lamella development may play a role in maintaining the apoplastic barrier in this layer by enlarging the contact area between the band and the lamellae.
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页码:2233 / 2237
页数:5
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