"
ABSTRACTJarak pagar (Jatropha curcasL.), salah satu tanaman sumber bahan bakar nabati tropis, telah terkenal karena ketahanannya terhadap
cekaman kekeringan, akan tetapi, kemampuannya untuk tumbuh pada lingkungan yang kering masih jarang diteliti.
Perubahan status air daun, kadar klorofil, suhu permukaan daun, konduktansi stomata, kadar prolin dan
abcisic acid (ABA), laju transpirasi dan fotosintesis dikaji pada empat genotip jarak pakar (IP-1A, IP-2M, Unggul lokal dan Daun
kuning) yang diperlakukan cekaman kekeringan pada lahan pasir pantai di Jawa Tengah, Indonesia. Cekaman kekeringan menurunkan secara signifikan status air daun, kadar klorofil daun, konduktansi stomata, laju transpirasi dan fotosintesis, dan meningkatkan suhu daun, kadar prolin dan ABA. Genotip tahan (IP-1A dan IP-2M) memiliki status air daun, kadar klorofil dan laju fotosintesis lebih tinggi secara signifikan dibandingkan dengan genotip yang peka (Unggul
lokal dan Daun kuning). Tidak terdapat perbedaan yang nyata di ntara genotip jarak pagar terhadap suhu daun, konduktansi stomata dan laju transpirasi.
AbstractJatropha curcas L., an important tropical biofuel crop, is reputed for its drought resistance, however, its ability to perform in dry conditions has still hardly been investigated. Changes in leaf water status, chlorophyll content, leaf surface temperature, stomatal conductan
ce, proline and abcisic acid (ABA) content, transpiration and photosyntheticrate were studied in four
Jatropha genotypes (IP-1A, IP-2M, Local superior and Yellow leaf) and subjected to drought stress in coastal sandy land conditions in Central Java, Indonesia. Drought stress significan
tly decreased the leaf water status, leaf chlorophyll content, stomatal conductance, transpiration and photosynthetic rate, and increased leaf
temperature, proline and ABA content. Resistant genotypes (IP-1A and IP-2M) had significantly higher leaf water status, chlorophyll content and photosynthetic rate than susceptible genotypes (Local superior and Yellow leaf). There were no differences between the
Jatropha genotypes on leaf temperature, stomat
al conductance and transpiration rate."
[Direktorat Riset dan Pengabdian Masyarakat UI;Universitas Mataram. Fakultas Pertanian;Universitas Mataram. Fakultas Pertanian;Universitas Mataram. Fakultas Pertanian, Universitas Mataram. Fakultas Pertanian], 2012
