Abstract
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.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
Coffee nursery shade gradients had a highly significant influence on leaf mass ratio, higher in shaded seedlings.
- Taxon
- Arabica Coffee
Coffea arabicat0 - Treatment
- coffee nursery shade gradientse1
- Outcome
- leaf mass ratio (LMR)e1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“coffee nursery shade gradients had highly significant influence on leaf mass ratio (LMR) with higher value measured in shaded seedlings”
Claim · model-written summary
Seedlings under full sunlight produced significantly higher shoot mass ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Treatment
- full-sunlighte1
- Outcome
- shoot mass ratio (SMR)e1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“seedlings under full-sunlight produced significantly higher shoot mass ratio (SMR)”
Claim · model-written summary
Leaf mass ratio differed highly significantly among natural sunlight regimes, genotypes and their interaction.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- genotypese1
- Treatment
- natural sunlight regimese1
- Outcome
- LMRe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“LMR was highly significantly different due to natural sunlight regimes, genotypes and interaction effects”
Claim · model-written summary
Seedlings exposed to direct sunlight had relatively higher root mass ratio, canopy area and leaf area index.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Treatment
- direct sunlighte1
- Outcome
- root mass ratio (RMR), SMR, canopy area (CA) and leaf area index (LAI)e1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Seedlings exposed to direct sunlight had relatively higher root mass ratio (RMR), SMR, canopy area (CA) and leaf area index (LAI)”
Claim · model-written summary
Coffee genotypes responded significantly in root mass ratio and leaf mass ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- coffee genotypese1
- Outcome
- RMR and LMRe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“The results also revealed significant responses among coffee genotypes in RMR and LMR”
Claim · model-written summary
Accessions from the drier Harenna areas had the highest root mass ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Accessions from the drier Harenna arease1
- Outcome
- RMRe1
- Direction
- higheste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Accessions from the drier Harenna areas exhibited the highest RMR”
Claim · model-written summary
Accessions from the drier Harenna areas had the least leaf mass ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Accessions from the drier Harenna arease1
- Outcome
- LMRe1
- Direction
- leaste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Accessions from the drier Harenna areas exhibited the highest RMR, but least LMR”
Claim · model-written summary
The Bonga accession had the highest specific leaf area and leaf area ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- The accession from Bongae1
- Outcome
- specific leaf area (SLA) and leaf area ratio (LAR)e1
- Direction
- higheste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“The accession from Bonga had the highest specific leaf area (SLA) and leaf area ratio (LAR)”
Claim · model-written summary
The Yayu population had the lowest specific leaf area.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Yayue1
- Outcome
- SLAe1
- Direction
- loweste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“as opposed to the lowest SLA and LAR in the Yayu and Harenna populations, respectively”
Claim · model-written summary
The Harenna population had the lowest leaf area ratio.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Harennae1
- Outcome
- LARe1
- Direction
- loweste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“as opposed to the lowest SLA and LAR in the Yayu and Harenna populations, respectively”
Claim · model-written summary
LARMR was low for the Harenna accessions.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Harennae1
- Outcome
- LARMRe1
- Direction
- lowe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Unlike RMR, LARMR was linked to LMR and was low for Harenna and high for Berhane-Kontir”
Claim · model-written summary
LARMR was high for the Berhane-Kontir accession.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Berhane-Kontire1
- Outcome
- LARMRe1
- Direction
- highe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Unlike RMR, LARMR was linked to LMR and was low for Harenna and high for Berhane-Kontir”
Claim · model-written summary
LARMR was linked to LMR.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Outcome
- LARMRe1
- Comparator
- LMRe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Unlike RMR, LARMR was linked to LMR”
Claim · model-written summary
Specific stem length was reduced in the Harenna and Yayu populations.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Harenna and Yayue1
- Outcome
- specific stem lengthse1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“The results also exhibited reduced specific stem lengths for Harenna and Yayu”
Claim · model-written summary
The Harenna population had the highest leaf area index.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Harennae1
- Outcome
- LAIe1
- Direction
- higheste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Harenna and Yayu, which had the highest and lowest LAI, respectively”
Claim · model-written summary
The Yayu population had the lowest leaf area index.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- Yayue1
- Outcome
- LAIe1
- Direction
- loweste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“Harenna and Yayu, which had the highest and lowest LAI, respectively”
Claim · model-written summary
Considerable differences in physiological growth characteristics were found between open sun and shaded seedlings.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Treatment
- open sune1
- Outcome
- physiological growth characteristicse1
- Comparator
- shaded seedlingse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“considerable differences between open sun and shaded seedlings as well as among arabica coffee genotypes for most physiological growth characteristics considered”
Claim · model-written summary
Considerable differences in physiological growth characteristics were found among arabica coffee genotypes.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Material
- arabica coffee genotypese1
- Outcome
- physiological growth characteristicse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“considerable differences between open sun and shaded seedlings as well as among arabica coffee genotypes for most physiological growth characteristics considered”
Claim · model-written summary
Shade microenvironments are needed for producing high quality coffee seedlings with balanced shoot and root growth.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Treatment
- shade microenvironmentse1
- Outcome
- production of high quality coffee seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“The results clearly demonstrate the need for shade microenvironments for production of high quality coffee seedlings with balanced shoot and root growth”
Claim · model-written summary
Significantly different magnitudes and patterns of relationships between growth traits were described.
- Taxon
- Arabica CoffeeCoffea arabicat0
- Outcome
- relationships between growth traitse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Seedlings of Arabica Coffee Genotypes”
e1“The study also describes significantly different magnitudes and patterns of relationships between growth traits”