Institutional Repository | Satya Wacana Christian University: Struktur Anatomi Organ Vegetatif Sorghum bicolor (L.) Moench pada Kondisi Cekaman Krom

Abstract
In this study, the anatomy responses of Sorghum bicolor to chromium
were investigated. To determine the responses arising for genotypic differences,
Badik and UPCA varieties were used. Random Factorial Design was used in this
study with three factors : chromium species (Cr (III) and Cr (VI)), concentration (0;
1,8; 4,5; and 13,6 mgCr kg-1 sand (w/w)), and Sorghum bicolor varities (Badik and
UPCA). The results revealed that both Cr (III) dan Cr (VI) decreased number and
size of vascular bundle, epidermis and mesophyll thickness, size and percentage
stomatal but increased lignin thickness. The effect was more pronounced on Cr
(VI) than Cr (III) caused its toxicity. The highest anatomy difference percentage
was in number of vascular bundle that showed 52,8% difference in Cr(VI) 4,5
mgCr/kg for Badik and 46% in Cr(III) 13,6 mgCr/kg for UPCA in roots. In stems, the
highest anatomy difference was in lignin thickness for Badik that showed 54%
increased in Cr(VI) 1,8 mgCr/kg and number of vascular bundle for UPCA that
showed 57,9% decreased in Cr(VI) 4,5 mgCr/kg. Meanwhile in leaves, the highest
anatomy difference percentage was in number of vascular bundle that showed
81,4% decreased for Badik and 65,8% decreased for UPCA in Cr(VI) 4,5 mgCr/kg. In
roots and stems, Badik had lower anatomy difference percentage than UPCA
except for lignin thickness. In leaves, UPCA showed anatomy difference
percentage lower than Badik.
Key words : chromium, Sorghum bicolor, anatomy structure.