Abstract
This study investigated the response of watermelon seedlings to drought stress by assessing the growth, physiological, and biochemical indices using a pot-based continuous drought method. Drought stress indices, phenotypic plasticity indices, and membership function values were calculated, followed by a correlation analysis, principal component analysis, and cluster analysis, to comprehensively evaluate the drought resistance of 13 watermelon genotypes. The results revealed that drought stress significantly reduced the fresh and dry weights, root length, root area, root volume, root tips, and forks of watermelon seedlings. Additionally, drought significantly reduced the relative water content of leaves and increased the levels of osmotic-adjustment substances (soluble sugars, soluble proteins, proline, and starch). Persistent drought also modulated the activities of antioxidant enzymes (SOD, POD, and CAT), leading to oxidative stress through the accumulation of H2O2. Membrane damage, indicated by a significant increase in the MDA content and relative conductivity, was observed, adversely affecting seedling growth. Phenotypic plasticity indices indicated that watermelon exhibits strong adaptability to drought. Cluster analysis categorized the 13 genotypes into four groups: highly drought-resistant (14X5), drought-resistant (LK13, JLR, HXF1, 14X4, 14X1, and 14X6), low drought-resistant (21F05, JH1, JR3, 14X7, and 16F02), and drought-sensitive (16C07). This study provides valuable genetic resources for breeding drought-resistant watermelon varieties.
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Claims 13
Claim · model-written summary
Drought reduced fresh and dry weights, root length, root area in watermelon seedlings.
- Taxon
- watermelon
Citrullus lanatuse0 - Treatment
- drought stresse0
- Outcome
- fresh and dry weights, root length, root areae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress significantly reduced the fresh and dry weights, root length, root area, root volume, root tips, and forks of watermelon seedlings”
Claim · model-written summary
Drought reduced root volume, root tips, and forks in watermelon seedlings.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- drought stresse0
- Outcome
- root volume, root tips, and forkse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress significantly reduced the fresh and dry weights, root length, root area, root volume, root tips, and forks of watermelon seedlings”
Claim · model-written summary
Drought reduced leaf relative water content.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- droughte0
- Outcome
- relative water content of leavese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“drought significantly reduced the relative water content of leaves”
Claim · model-written summary
Drought increased soluble sugars, soluble proteins and proline.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- droughte0
- Outcome
- soluble sugars, soluble proteins, prolinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“drought significantly reduced the relative water content of leaves and increased the levels of osmotic-adjustment substances (soluble sugars, soluble proteins, proline, and starch)”
Claim · model-written summary
Drought increased starch.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- droughte0
- Outcome
- starche0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“drought significantly reduced the relative water content of leaves and increased the levels of osmotic-adjustment substances (soluble sugars, soluble proteins, proline, and starch)”
Claim · model-written summary
Persistent drought modulated antioxidant enzyme activities.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- Persistent droughte0
- Gene
- SOD, POD, and CATe0
- Outcome
- activities of antioxidant enzymese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“Persistent drought also modulated the activities of antioxidant enzymes (SOD, POD, and CAT)”
Claim · model-written summary
Persistent drought caused H2O2 accumulation and oxidative stress.
- Taxon
- WatermelonCitrullus lanatust0
- Compound
- H2O2e0
- Outcome
- oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“leading to oxidative stress through the accumulation of H2O2”
Claim · model-written summary
Drought significantly increased MDA content and relative conductivity.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- droughte1
- Outcome
- MDA content and relative conductivitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“Membrane damage, indicated by a significant increase in the MDA content and relative conductivity”
e1“Persistent drought also modulated the activities of antioxidant enzymes”
Claim · model-written summary
Watermelon phenotypic plasticity indicated strong drought adaptability.
- Taxon
- watermelonCitrullus lanatuse0
- Outcome
- strong adaptability to droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phenotypic plasticity indices indicated that watermelon exhibits strong adaptability to drought.”
Claim · model-written summary
14X5 was classified as highly drought-resistant.
- Taxon
- WatermelonCitrullus lanatust0
- Material
- 14X5e0
- Outcome
- highly drought-resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“highly drought-resistant (14X5), drought-resistant (LK13, JLR, HXF1, 14X4, 14X1, and 14X6), low drought-resistant (21F05, JH1, JR3, 14X7, and 16F02), and drought-sensitive (16C07)”
Claim · model-written summary
LK13, JLR, HXF1, 14X4, 14X1, and 14X6 was classified as drought-resistant.
- Taxon
- WatermelonCitrullus lanatust0
- Material
- LK13, JLR, HXF1, 14X4, 14X1, and 14X6e0
- Outcome
- drought-resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“highly drought-resistant (14X5), drought-resistant (LK13, JLR, HXF1, 14X4, 14X1, and 14X6), low drought-resistant (21F05, JH1, JR3, 14X7, and 16F02), and drought-sensitive (16C07)”
Claim · model-written summary
21F05, JH1, JR3, 14X7, and 16F02 was classified as low drought-resistant.
- Taxon
- WatermelonCitrullus lanatust0
- Material
- 21F05, JH1, JR3, 14X7, and 16F02e0
- Outcome
- low drought-resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“highly drought-resistant (14X5), drought-resistant (LK13, JLR, HXF1, 14X4, 14X1, and 14X6), low drought-resistant (21F05, JH1, JR3, 14X7, and 16F02), and drought-sensitive (16C07)”
Claim · model-written summary
16C07 was classified as drought-sensitive.
- Taxon
- WatermelonCitrullus lanatust0
- Material
- 16C07e0
- Outcome
- drought-sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“highly drought-resistant (14X5), drought-resistant (LK13, JLR, HXF1, 14X4, 14X1, and 14X6), low drought-resistant (21F05, JH1, JR3, 14X7, and 16F02), and drought-sensitive (16C07)”
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