Jatropha curcas, L. Stem

Romero, Giovanna E., 2022, Stem and caudex anatomy of succulent plant species, Adansonia (3) 44 (10), pp. 81-90 : 84

JATROPHA CURCAS L.

Stem cortex has scattered laticifers. Wood is just formed. Vascular cambium occurs in the entire circumference Some phloem is visible. Pith has some amyloplasts.

Caudex cortex is chlorenchymatous and it has druses and scattered laticifers. Wood is diffused fibrous. The axial matrix is formed by solitary or two vessels with circular bordered pits ( Fig. 2 C-E), also it has thin secondary wall libriform fibers ( Fig. 2F ) and apotracheal unilateral parenchyma with abundant amyloplasts. Ray system is uniseriate with abundant amyloplasts ( Fig. 2F ). Secondary phloem ray parenchyma has begun to dilatate. Laticifers run parallel to the secondary phloem. Primary phloem fibers are above secondary phloem, these fibers are gelatinous fibers and have formed an incomplete ring around caudex circumference.Pith has large parenchyma cells with abundant amyloplasts.

Figures

FIG. 2. — Transverse sections of stems and caudices, unless otherwise noted: A, B, Momordica rostrata Zimm; A, caudex, septate fibers, tangential section; B, caudex, vessels with bordered pits; C-F, Jatropha curcas L.; C, caudex, solitary vessels, wood; D, caudex, fibrous wood; E, caudex, vessels, radial section; F, caudex,thin-walled libriform fibers,parenchyma with amyloplasts,radial section;G, H, Jatropha macrantha Müll.Arg.; G, stem,diffuse fibrous wood,thin-walled libriform fibers, septate and gelatinous fibers; H, stem, axial and ray parenchyma. Abbreviations: ur, uniseriate ray; br, biseriate ray; p, parenchyma; f, fibers; sp, secondary phloem; ct, conjunctive tissue; sf, septate fibers; v, vessel; lf, libriform fibers. Scale bars: A, C-H, 50 µm; B, 10 µm.