Hydraulic conductivity in stem of young plants of Jatropha curcas L. cultivated under irrigated or water deficit conditions

Climatic changes and drought reduced plant growth and development. Brassinosteroids act in maintaining turgor and plant growth, increasing tolerance to water stress. The objective of the present study was to identify the effect of brassinosteroids in reducing stresses caused by water deficit in Jatropha curcas L. plants. The study was carried out in a greenhouse at the State University of Goiás, in a completely randomized block design in a factorial 2 × 5 arrangement (plants submitted to five brassinosteroids concentrations (0, 2, 4, 8, 16 mg L-1) and two levels of daily water supply (50% and 100% evapotranspiration) six replications and the plot consisted of one useful plant. A 10 mL volume of the hormone was applied 30 days after emergence and 20 mL at 60 days after emergence, totaling 30 ml. The water deficit was imposed at 70 days after emergence and the evaluations were made at 100 d after emergence. Under water deficit, production increased of reactive substances that damage membranes and proteins, but brassinosteroids played an important role in mitigating the deleterious effects of water deficit on J. curcas plants by acting as an elicitor in activating photoprotection mechanisms that increased vegetative growth and maintained membrane integrity. The antioxidant and growth machinery activation reached maximum points at the 8 mg L-1 brassinosteroids concentration and even higher concentrations

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Nocturnal acidification in leaves of two genotypes of Jatropha curcas L., subjected to soil water deficit

Plant Physiology Reports ◽

10.1007/s40502-021-00576-2 ◽

2021 ◽

Author(s):

Fábio Pinto Gomes ◽

Alex-Alan Furtado de Almeida ◽

Marcelo Schramm Mielke ◽

Bruno Galvêas Laviola ◽

Leandro Dias da Silva

Keyword(s):

Soil Water ◽

Water Deficit ◽

Jatropha Curcas ◽

Soil Water Deficit ◽

Jatropha Curcas L

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Pertumbuhan Beberapa Genotipe Jarak Pagar (Jatropha Curcas L.) di Tanah Masam

Buletin Agrohorti ◽

10.29244/agrob.v5i2.16806 ◽

2017 ◽

Vol 5 (2) ◽

pp. 251-263

Author(s):

Indah Retnowati ◽

Memen Surahman

Keyword(s):

Jatropha Curcas ◽

Jatropha Curcas L

Indonesia memiliki banyak tanah masam, tetapi penggunaan masih sangat sedikit karena kandungan nutrisi tanah masam rendah. Sementara itu, jarak pagar merupakan tanaman yang dapat tumbuh di berbagai jenis tanah (termasuk lahan marjinal) dan penggunaannya sebagai bahan baku biodiesel. Oleh karena itu, perlunya penelitian mengenai pertumbuhan jarak pagar pada tanah masam sebagai upaya untuk mengembangkan jarak pagar dan penggunaannya di Indonesia.Untuk memulai upaya, penelitian tentang berbagai genotipe jarak pagar di tanah masam telah dilakukan. Tujuan dari penelitian ini yaitu mempelajari genotipe jarak pagar yang berpotensi untuk tanah masam. Penelitian ini dilakukan di UPTD Pengembangan Teknologi Lahan Kering Singabraja, Kecamatan Tenjo, Bogor, Jawa Barat, dari November 2010-Agustus 201. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor yaitu genotipe. Hasil penelitian menunjukkan berbagai perbedaan pada pertumbuhan diantara genotipe-genotipe jarak pagar. Secara umum, ada lima genotipe jarak pagar yang terbaik di tanah masam (pH 5.0) yaitu Medan I-5-1, Dompu, IP-2P-3-4-1, Sulawesi, dan Bima M.

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