TITLE:
Root Anatomical Structure of Jatropha curcas Seedlings—A Short Report
AUTHORS:
Jun Abe
KEYWORDS:
Adventitious Root, Casparian Strip, Jatropha curcas, Root Endo-dermis, Root Exodermis
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.10 No.3,
March
28,
2019
ABSTRACT: Jatropha curcas has been expected as a biodiesel plant which can be
grown in degraded lands. The structure of roots at the seedling stage, in
particular cell wall modification in exodermis and endodermis, was
microscopically observed. In addition, it was discussed if the first four
peripheral roots that emerge from the base of the primary root (taproot) are
lateral roots or adventitious roots. The primary root and the first-order
lateral roots formed diarchy stele, in which two protoxylem poles present in
primary xylem of root. Consequently, the first four peripheral roots cannot be
lateral roots, but should be adventitious roots formed at the base of
hypocotyl. In both the primary and first-order lateral roots, exodermis and
endodermis formed highly lignified cell walls. Moreover, the exodermal and endodermal
cell walls formed Casparian strips, which could be observed without special
staining by fluorescent dye under ultraviolet microscopy. Such cell-wall
modification in root exodermis and endodermis may play an important role for J. curcas under soil stresses in
degraded lands.