Penapisan Genotipe Jarak Pagar (Jatropha curcas L.) untuk Toleransi terhadap Kekeringan

Abstract

The selection of Jatropha curcasfor drought tolerance is one of the key points prior to growing the species extensively
on marginal lands. The objective of this study was to determine drought tolerant genotypes based on morphological and
physiological characters. The research consisted of two experiments. The first experiment was aimed at determining the
moisture content of the media to generate drought stress. The experiment was arranged in a split-plot design with moisture
content as the main plot and genotypes as sub-plot. Four level of moisture contents were tested, i.e. 22-23%, 27-28%, 32-33%,
and 37-38%. The genotypes tested (9) were Dompu-1, Gunung Tambora, Bima (representing genotypes from dry areas); Aceh
Besar, IP-2P, Komering (representing genotypes from wet areas); and IP-1M, Papua, Yogyakarta (representing genotypes
from moderately dry areas). The result showed that 22-23% moisture content of the media was suitable for drought tolerance
test in Jatropha curcas. The second experiment was screening of genotypes using the suitable media moisture content from
first experiment. Twenty three genotypes were screened for drought tolerance under 22-23% media moisture content. The
result show that Dompu-2, Indralaya and China were tolerant to drought; Sukabumi-1, Sukabumi-2, Pidi, Lahat, Kupang,
Lampung-2, Lampung-3, Sumba, IP-2M, and IP-2A genotypes were moderately tolerant; Curup, Bogor-1, Bogor-2, Bogor-3,
Pontianak, Pagar Alam, Palembang, Saweli, Jeneponto, and Medan genotypes were sensitive to drought. Plant height, leaf
water content, leaf area and percentage of plant survival can be used as indicators of drought tolerance for seedling selection
using a non-destructive method.
Keywords: drought tolerance, genotypes, Jatropha curcas, screening