Abstract
The main production area of Camellia vietnamensis (C. vietnamensis) is in the low mountain and hilly areas of southern China. The low survival rate of seedlings caused by drought is one of the main obstacles restricting the development of the C. vietnamensis industry. An exploration of the key adaptation mechanism of C. vietnamensis to drought stress is important in order to improve its drought resistance. We conducted a study on the morphological, physiological, biochemical, and drought resistance-related genes of five C. vietnamensis cultivars grown in Hainan province under varying degrees of drought stress. The results indicate that drought stress can lead to a decrease in the relative water content and photosynthetic capacity of C. vietnamensis leaves. Compared with the control, the drought damage index, malondialdehyde, relative electrical conductivity, soluble protein, soluble sugar and proline contents of the five C. vietnamensis cultivars increased with drought-stress duration and degree. With increasing drought-stress intensity, the activity of antioxidant enzymes and the content of related metabolites (total polyphenols, total flavonoids, tea saponins) gradually increased, and the expression levels of phenylpropanoid pathway-related genes (Cv4CL1, CvCAD1, CvCAD2, CvPOX1, CvPOX2, CvPOX3) were upregulated. Based on the results of the drought tolerance coefficients, principal component analysis, and hierarchical cluster analysis, we classified five C. vietnamensis cultivars into drought-tolerant cultivars (‘Haida 1’); moderately drought-tolerant cultivars (‘Haida 4’ and ‘Wanhai 4’); and drought-sensitive cultivars (‘Wanhai 3’ and ‘Wanhai 1’). The results of this study provide a theoretical basis for the promotion and cultivation of C. vietnamensis and the selection of drought-resistant cultivars.
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Claims 9
Claim · model-written summary
Drought decreased leaf relative water content and photosynthetic capacity.
- Taxon
- Camellia vietnamensis
Camellia vietnamensist0 - Organ / stage
- leavese0
- Treatment
- drought stresse0
- Outcome
- relative water content and photosynthetic capacitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress can lead to a decrease in the relative water content and photosynthetic capacity of C. vietnamensis leaves”
t0“Camellia vietnamensis”
Claim · model-written summary
Drought damage index, malondialdehyde and electrical conductivity rose with drought duration and degree.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Treatment
- drought-stress duration and degreee0
- Outcome
- drought damage index, malondialdehyde, relative electrical conductivitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the drought damage index, malondialdehyde, relative electrical conductivity, soluble protein, soluble sugar and proline contents of the five C. vietnamensis cultivars increased with drought-stress duration and degree”
t0“Camellia vietnamensis”
Claim · model-written summary
Soluble protein, sugar and proline contents rose with drought duration and degree.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Treatment
- drought-stress duration and degreee0
- Outcome
- soluble protein, soluble sugar and proline contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble protein, soluble sugar and proline contents of the five C. vietnamensis cultivars increased with drought-stress duration and degree”
t0“Camellia vietnamensis”
Claim · model-written summary
Antioxidant enzyme activity increased with drought intensity.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Treatment
- increasing drought-stress intensitye0
- Outcome
- activity of antioxidant enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing drought-stress intensity, the activity of antioxidant enzymes and the content of related metabolites (total polyphenols, total flavonoids, tea saponins) gradually increased”
t0“Camellia vietnamensis”
Claim · model-written summary
Total polyphenols, flavonoids and tea saponins increased with drought intensity.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Outcome
- total polyphenols, total flavonoids, tea saponinse0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of related metabolites (total polyphenols, total flavonoids, tea saponins) gradually increased”
t0“Camellia vietnamensis”
Claim · model-written summary
Six phenylpropanoid pathway genes were upregulated as drought intensified.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Gene
- Cv4CL1, CvCAD1, CvCAD2, CvPOX1, CvPOX2, CvPOX3e0
- Outcome
- expression levels of phenylpropanoid pathway-related genese0
- Direction
- upregulatede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expression levels of phenylpropanoid pathway-related genes (Cv4CL1, CvCAD1, CvCAD2, CvPOX1, CvPOX2, CvPOX3) were upregulated”
t0“Camellia vietnamensis”
Claim · model-written summary
Haida 1 was classified as drought tolerant.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Material
- Haida 1e0
- Outcome
- drought-tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-tolerant cultivars (‘Haida 1’)”
t0“Camellia vietnamensis”
Claim · model-written summary
Haida 4 and Wanhai 4 were classified as moderately drought tolerant.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Material
- Haida 4’ and ‘Wanhai 4e0
- Outcome
- moderately drought-tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderately drought-tolerant cultivars (‘Haida 4’ and ‘Wanhai 4’)”
t0“Camellia vietnamensis”
Claim · model-written summary
Wanhai 3 and Wanhai 1 were classified as drought sensitive.
- Taxon
- Camellia vietnamensisCamellia vietnamensist0
- Material
- Wanhai 3’ and ‘Wanhai 1e0
- Outcome
- drought-sensitive cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive cultivars (‘Wanhai 3’ and ‘Wanhai 1’)”
t0“Camellia vietnamensis”