Biomass production and distribution in seedlings of &amp;lt;i&amp;gt;Coffea Arabica&amp;lt;/i&amp;gt; genotypes under contrasting nursery environments in southwestern Ethiopia

Kufa, Taye

doi:10.4236/as.2012.36101

Cited by 12 publications

(14 citation statements)

References 12 publications

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“…There was a significant effect of reduced irrigation frequency on seedlings growth as determined by reduced change in plant height and reduced leaf and node growth. This could reflect the variations among the coffee genotypes in growth rate which in turn depend upon stem nature (stiff or flexible) and size of water conducting tissue [21]. The observed effect of reduced irrigation frequency on growth was in agreement with the finding of Worku and Astatkie [3] that every growth characteristics in coffee seedlings is affected by drought stress.…”

Section: Discussionsupporting

confidence: 89%

Effect of Different Watering Regimes on Agro-morphology of Selected Coffee Genotypes

King'oro¹,

Mushimiyamana²,

Cheserek³

et al. 2014

AJEA

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Aims: The aim of this study was to determine the effect of different watering regimes on selected coffee genotypes and to evaluate drought tolerance among selected coffee genotypes. The study also aimed at determining the optimum watering interval for these genotypes under high temperature conditions. Study Design: Completely Randomized Design (CRD) with 3 replications. Place and Duration of Study: The experiment was conducted in a greenhouse at Coffee Research Station in Ruiru, Kenya between October and December 2012. Methodology: A total of 11 coffee genotypes were used in this study. These comprised of Coffea canephora (Robusta), one wild accession and nine Coffea arabica genotypes. Six months old seedlings of the test genotypes pre-germinated and transplanted in black polythene bags were obtained from the Coffee Research Station experimental nursery. The seedlings were placed on raised benches in the green house and each potted seedling represented a plot. The seedlings were watered with 0.3 liters of water per pot at six watering regimes applied as follows: watering after every 2 days, 4 days, 7days, 14

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Section: Discussionsupporting

confidence: 89%

Effect of Different Watering Regimes on Agro-morphology of Selected Coffee Genotypes

King'oro¹,

Mushimiyamana²,

Cheserek³

et al. 2014

AJEA

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“…Shade-grown coffee plants can develop thinner leaves with more thylakoids per granum and more grana per chloroplast, higher chlorophyll content and larger individual leaf area, which allow a more efficient capture of available light energy [16]. Reduced CO 2 assimilation rates in coffee leaves subjected to full sun have been associated with leaf temperatures above 25°C and with consequent stomatal closure [18].…”

Section: Discussionmentioning

confidence: 99%

Physiological Growth Response in Seedlings of Arabica Coffee Genotypes Under Contrasting Nursery Microenvironments

Kufa¹

2015

PLANT

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Arabica coffee genetic resources and shade-grown coffee landscapes are under threat largely due to human activities and lack of scientific information and understanding on adaptation mechanisms along environmental gradients. The study aims to describe the variability in early physiological growth responses in arabica coffee genotypes of varying geographical areas in Ethiopia, its birthplace. The experiment was carried out under contrasting nursery microclimatic settings at the Jimma Agricultural Research Center in Ethiopia. A split-plot design with three replications of two sunlight regimes and twelve-coffee genotypes were arranged as main and sub-plot treatments, respectively. One-year-old coffee seedlings were used to measure shoot and root growth parts and calculate derivatives on physiological parameters. The results depicted that coffee nursery shade gradients had highly significant influence on leaf mass ratio (LMR) with higher value measured in shaded seedlings. In contrast, seedlings under full-sunlight produced significantly higher shoot mass ratio (SMR). Likewise, LMR was highly significantly different due to natural sunlight regimes, genotypes and interaction effects. Seedlings exposed to direct sunlight had relatively higher root mass ratio (RMR), SMR, canopy area (CA) and leaf area index (LAI). The results also revealed significant responses among coffee genotypes in RMR and LMR. Accessions from the drier Harenna areas exhibited the highest RMR, but least LMR. The accession from Bonga had the highest specific leaf area (SLA) and leaf area ratio (LAR) as opposed to the lowest SLA and LAR in the Yayu and Harenna populations, respectively. Unlike RMR, LARMR was linked to LMR and was low for Harenna and high for Berhane-Kontir. The results also exhibited reduced specific stem lengths for Harenna and Yayu, which had the highest and lowest LAI, respectively. The study shows considerable differences between open sun and shaded seedlings as well as among arabica coffee genotypes for most physiological growth characteristics considered. The results clearly demonstrate the need for shade microenvironments for production of high quality coffee seedlings with balanced shoot and root growth. The study also describes significantly different magnitudes and patterns of relationships between growth traits for future work. In view of the impacts of changing climate on coffee plant, the findings deliver evidence on genetic diversity within arabica coffee accessions of varying geographical areas in Ethiopia. However, further investigations, inter alia, on detail coffee evolutionary, anatomy, molecular, ecophysiological and desirable agronomic traits across seasons and locations for understanding adaptation strategies to environmental stresses and identifying suitable coffee cultivars for specific geographical areas.

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“…Coffee is traditionally considered a heliophobic plant, which requires dense forest cover (Kufa 2012).…”

Section: Introductionmentioning

confidence: 99%

Identifying potential areas of understorey coffee in Ethiopia’s highlands using predictive modelling

Hailu

Maeda

Pellikka

et al. 2015

International Journal of Remote Sensing

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Coffee production is one of the main economic activities in Ethiopia, representing about 40% of the country's economy. Coffee is particularly important in the Ethiopian highlands, where appropriate climate allows higher productivity and quality. The Ethiopian highlands also host an outstanding biodiversity, being considered one of the world's most important biodiversity hotspots. In this context, conciliating agricultural practices with biodiversity conservation is a priority task for researchers and other stakeholders. However, identifying and mapping understorey coffee plantations in Ethiopian highlands is particularly challenging due to the presence of scattered exotic trees and the characteristics of understorey cultivation. In this research, we mapped potential areas of understorey coffee using predictive modelling and evaluated how projected changes in climate would affect the suitability of coffee production in the study area. Landscape maps, which were mapped using remote-sensing data based on object-based image analysis, remotely sensed spectral vegetation indices, and climatic variables were used to delineate probability maps showing the most likely location of understorey coffee. Normalized difference vegetation index and maximum temperature and precipitation were considered the best predictors for explaining the spatial distribution of understorey coffee. The accuracy of the probability map was validated based on existing understorey coffee areas mapped during field surveys. In addition, we show that potential changes in temperature and precipitation by 2050 are likely to shift suitable areas of understorey coffee to higher altitudes, affecting the landscape changes dynamics in the region.

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Biomass production and distribution in seedlings of <i>Coffea Arabica</i> genotypes under contrasting nursery environments in southwestern Ethiopia

Cited by 12 publications

References 12 publications

Effect of Different Watering Regimes on Agro-morphology of Selected Coffee Genotypes

Effect of Different Watering Regimes on Agro-morphology of Selected Coffee Genotypes

Physiological Growth Response in Seedlings of Arabica Coffee Genotypes Under Contrasting Nursery Microenvironments

Identifying potential areas of understorey coffee in Ethiopia’s highlands using predictive modelling

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