Vol 40, No 2 (2012)

Jurnal Agronomi Indonesia

Table of Contents

Articles

Joko Prasetiyono, Tintin Suhartini, Ida Hanarida Soemantri, , Tasliah, Sugiono Moeljopawiro, Hajrial Aswidinnoor, Didy Sopandie, Masdiar Bustamam
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Aidi Noor, Iskandar Lubis, Munif Ghulamahdi, Muhammad Achmad Chozin, Khairil Anwar, Desta Wirnas
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, Suaib, Makmur Jaya Arma
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The average productivity of upland rice is still relatively low. Therefore, it is necessary to improve agronomic characters related to grain yields, maturity, and their adaptation in dry land. The aims of this research were to evaluate agronomic traits, genetic parameters such as genetic and phenotype variance, heritability and G x E interaction of rice mutant lines derived from gamma irradiation treatment on upland rice. This research was conducted in Situbondo and Madiun, during rain season. The analysis of variance (ANOVA) showed that DT15/11/KU and 1058/Cty mutant lines have higher yield compared with Situgintung (check variety). The grain yield per hectare from DT15/11/KU and 1058/Cty mutant lines were 7.76 ton ha-1and 7.18 ton ha-1respectively, with 12% of water content. Broad-sense heritability, genetic and phenotypic and environmental variances for agronomical traits such as filled grain per panicle, weight of 1,000 grain, yield per plot and yield per hectare were observed. The results showed that broad-sense heritability for weight of 1,000 grain was 94%, whereas other characters was less than 40%. Phenotypic variance was dominated by genetic variance for weight of 1,000 grain. Further selection for filled grain per panicle, yield per plot and yield per hectare needs to be conducted. G x E interaction and genotype were highly significant, whereas location variance was highly significant for filled grain and weight of 1,000 grains.

Keywords: agronomic characters, broad-sense heritability, G x E interaction, genetic variance, upland rice

, Ishak
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Widodo Haryoko, , Kasli, Irfan Suliansyah, Auzar Syarif, Teguh Budi Prasetyo
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Abdullah Bin Arif, Sriani Sujiprihati, Muhamad Syukur
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Gusti Ayu Kade Sutariati, La Ode Safuan
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Luluk Prihastuti Ekowahyuni, Surjono Hadi Sutjahjo, Sriani Sujiprihati, Mohamad Rahmad Suhartanto, Muhamad Syukur
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Eko Setiawan, Roedhy Poerwanto, Fumio Fukuda, Nobuo Sugiyama, Kuniyuki Saitoh, Naohiro Kubota
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Black pod disease (BPD) of cacao caused by Phytophthora palmivora(Butl.) is one of the major diseases on cacao plantation worldwide. Endophytic fungi (EF), fungi that live asymptomatically inside healthy plants, were examined to study their potentials as biocontrol agent of the disease. Six of EF selected from 37 species (from 2843 isolates), isolated from healthy pods of cacao from Marena in Central Sulawesi were tested for their abilities to control BPD. Pods on living trees in the field were sprayed with each EF propagules. The inoculated pods were harvested two weeks later and subsequently inoculated with P. palmivora. Scoring of disease development was performed and quantified as area under disease progress curve (AUDPC). Latent period, infection rate and effectiveness were also recorded. In vitro growth inhibition of pathogen and induced plant defense mechanisms due to EF were also investigated. Xylariaceaeand Calocybe gambosatreatment generated the highest effectiveness control level, i.e. 38.8% and 33.8% respectively, followed by Resinicium friabileand Aschersoniatreatment, i.e. 17.4% dan 12.7% respectively.  Pestalotiopsisand Fusariumwere not effective to control BPD. There was a strong connection between disease severity of BPD with the latent period of pathogen. Growth inhibition of pathogen and induced resistance of plant were partially responsible for disease suppression by Xylariaceae, C. gambosa, R. friabileand Aschersonia.

Keywords: Calocybe gambosa, induced resistance, peroxidases, salicylic acid, Xylariaceae

Efi Toding Tondok, Meity Suradji Sinaga, , Widodo, Maggy Thenawidjaja Suhartono
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Waras Nurcholis, Edy Djauhari Purwakusumah, Mono Rahardjo, Latifah K. Darusman
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Leo Mualim, Sandra Arifin Aziz, Slamet Susanto, Maya Melati
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