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Coffee Science     Open Access   (SJR: 0.398, CiteScore: 1)
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Coffee Science
Journal Prestige (SJR): 0.398
Citation Impact (citeScore): 1
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1809-6875 - ISSN (Online) 1984-3909
Published by Editora UFLA Homepage  [1 journal]
  • Temporal progress of coffee leaf rust and environmental conditions
           affecting severity in Veracruz State, Mexico

    • Authors: Ivan Pale-Ezquivel, Ricardo Musule Lagunes, Maria del Rosario Pineda-López, Enrique Alarcón-Gutiérrez, Lázaro Rafael Sánchez-Velásquez
      Abstract: Coffee is an important crop in Mexico. Unfortunately, coffee production has been affected by coffee leaf rust (CLR). The severity of this infection occurs with variations along the year described before in different coffee-producing regions worldwide. For Veracruz, there are available reports of weekly CLR severity, but this information is only descriptive. We analyzed variations along the year of CLR severity in Veracruz with data from municipal weekly reports provided by Mexico’s federal government phytosanitary epidemiological monitoring coffee program. We selected reports dated in 2018 from nine municipalities and after calculations of mean monthly severity values, we conducted a one-way ANOVA (months as factors) of severity data. We compared this information with other coffee-producing regions. Additionally, we explored the association of temperature, rainfall, and altitude with CLR severity using Principal Component Analysis and multiple linear regressions. Temperature and rainfall data were obtained from Mexican National Meteorological Service. We found that CLR severity in January, October, November, and December (months of harvest period) was significantly higher than values from March-June. During the harvest period, coffee plants allocate resources mainly for fruiting which competes in resources for other tasks such as defense and leaf growth, so this competition of resources can explain the positive relationship found between fruit load and CLR severity. This monthly variation of severity was similar to those reported in Chiapas, Guatemala, Colombia, Uganda, and Ethiopia. Our model (R2 = 0.401) showed a significant and negative effect of altitude and medium temperature on CLR severity, while the effect of rainfall was positive. With our study, we suggest applications of fungicides in March-June when coffee plantations are in leaf phenophase. Key words: Altitude; Coffea arabica; Hemileia vastatrix; phenophase.
      PubDate: 2023-03-28
      DOI: 10.25186/.v18i.2047
      Issue No: Vol. 18 (2023)
  • Regeneration and development of Coffea arabica L. plants through indirect
           somatic embryogenesis

    • Authors: Rina Arimarsetiowati, Budi Setiadi Daryono, Yohana Theresia Maria Astuti, Erwin Prastowo, Endang Semiarti
      Abstract: Micropropagation of AS2K clones Arabica coffee (Coffea arabica L.) was attempted through indirect somatic embryogenesis by using ten different parts of the leaf such as shoot, first leaf base, second leaf base, third leaf base, first leaf middle, second leaf middle, third leaf middle, first leaf tip, second leaf tip, and third leaf tip. The influence of the part of leaf explants, combination of plant growth regulator (PGRs) in the induction of embryogenic callus and regeneration of embryo somatic were studied. Furthermore, the various protocols to induce regeneration of somatic embryo into plantlet through different step of subculture and the use of various germination medium were demonstrated. The morphological characteristics and histological analysis of embryogenic callus and embryo development were observed. In this experiment, it was observed that the M5 medium supplemented with 1 mg/L 2,4-D, 1 mg/L BAP and 4 mg/L 2-ip was closely associated with third leaf tip explants for induction of embryogenic callus. The maximum number of globular, heart-shape, torpedo and cotyledones (18, 4, 12, 4, respectively) were achieved on ERM6 medium containing 2 mg/L BAP without activated charcoal on 90th day for regeneration of embryo somatic. The length of roots is the most influence paramater on plantlet regeneration, and the 17th protocol which used B medium, large embryos and twice phase of subculture from liquid medium to solid medium is the best protocol for plantlet regeneration. The protocol developed could be useful highly for large-scale micropropagation in these commercially important Arabica coffee clones. Key words: Indirect somatic embryogenesis; 24-D; BAP; histology; anatomy.
      PubDate: 2023-03-10
      DOI: 10.25186/.v18i.2078
      Issue No: Vol. 18 (2023)
  • Evaluation of a prototype of soil thermal solarizer for control of gall
           nematode in the production of coffee seedlings

    • Authors: Francisco Paiva Uchoa, José Roberto Vieira Junior, Cléberson de Freitas Fernandes, Rodrigo Barros Rocha, Marcelo Curitiba Espíndula, Vaneide Araújo de Sousa Rudnick, Dvany Mamedes da Silva, Tamiris Chaves Freire, Simone Carvalho Sangi, Solange Aparecida Rodrigues Mariobo
      Abstract: In coffee crops at Rondônia State of Brazil, there is an increase in phytonematode epidemics.Since most local coffe nurseries at Rondônia use soil as substrate for seedling production, this work aimed to test the minimum exposure time at 60 ºC to control of root-knot nematodes Meloidogyne incognita in soil by means of solar heating, using a solarizer, in an adapted version for better heating perfomance. The used solarizer prototype was built of a wooden box covered with metal sheets, thermal blankets, painted black, with aluminum pipes of 0.5 cm in diameter at the bottom of the box that circulates the water heated by the collector box. The soil was inoculated with a suspension of 1000 eggs + J2 of M. incognita per liter and placed in equipment with a capacity of 150 liters. Exposure times at a minimum temperature of 60 °C were evaluated, with 14 treatments: C1 (non-inoculated and not autoclaved), C2 (inoculated), C3 (non-inoculated and autoclaved) T0’, T15’, T30’, T45’, T60’, T180’, T360’, T720’, T1440’, T2880’ and T4320’ . The temperature was measured every 15 minutes using a skewer-type digital thermometer. The soil was removed according to the exposure time, and placed in 8-liter pots, in which clone 125 and BRS 2357 coffee seedlings, susceptible to M. incognita , were transplanted and growing in a greenhouse for 180 days. The experimental design used was DIC, with 6 replications, each seedling as na experimental unit. Reproduction factor (FR), number of eggs per plant (NOGR) and number of galls per gram of root (NGGR) were evaluated. The FR, NOGR and NGGR variables reduced with exposure time. All treatments showed an effect to control the population of M. incognita in infected soils, with 100% efficacy of pathogen eradication from the T45’ treatment, 60 minutes of exposure is recommended for the production of Coffea canephora seedlings. Taken together, thir work showed the high potential of thr solorizer to contribute in the
      root-knot nematode control to seedling production. Key words: Thermal control; Meloidogyne incognita; Coffea canephora.
      PubDate: 2023-02-23
      DOI: 10.25186/.v18i.2014
      Issue No: Vol. 18 (2023)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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