Abstract
The selection of salt-tolerant watermelon rootstocks requires the evaluation of its underlying mechanism. The present study investigated the effect of applying 200 mmol·L−1 NaCl on various physiological and biochemical parameters of Citrullus lanatus ‘Jingxin No.2’ (abbreviated as W) seedlings grafted onto W, Cucurbita moschata ‘Quanneng Tiejia’ (P1), ‘Kaijia No.1’ (P2), and Lagenaria siceraria ‘Hanzhen No.3’ (G), which were grown hydroponically. All the measured growth parameters were significantly inhibited by salt stress, with W/P2 exhibiting superior growth. Salt stress increased Na+ uptake, which in turn disrupted K+/Na+ homeostasis in all grafting combinations. The photosynthetic capacity, chlorophyll concentration, and photochemical efficiency of photosystem II of all grafts significantly decreased with salt stress. However, W grafted onto G and P2 showed higher resistance than W grafted onto W and P1. Electrolyte leakage (EL) superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase activity were significantly affected by both grafting and salt stress. Minimum EL was observed in W/P2, which also exhibited superior antioxidative capacity. Physiological and biochemical assessment indicated that W grafted onto the P2 rootstock displayed the greatest salt tolerance. Plants grafted onto salt-resistant P2 accumulated less Na+ and reactive oxygen species (ROS) and exhibited superior growth, photosynthesis, and ROS-scavenging capacity compared to those grafted onto the other rootstocks. Keywords: watermelon, rootstock, grafting, salt stress, physiological response
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Claims 11
Claim · model-written summary
Salt stress significantly inhibited all measured growth parameters; W/P2 retained superior growth.
- Taxon
- Citrullus lanatus
Citrullus lanatuse1 - Material
- W/P2e0
- Treatment
- salt stresse0
- Outcome
- growth parameterse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the measured growth parameters were significantly inhibited by salt stress, with W/P2 exhibiting superior growth”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
Salt stress increased Na+ uptake in every graft combination.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Treatment
- Salt stresse0
- Outcome
- Na+ uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress increased Na+ uptake, which in turn disrupted K+/Na+ homeostasis in all grafting combinations”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
Increased Na+ uptake under salt stress disrupted K+/Na+ homeostasis across grafts.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Treatment
- Salt stresse0
- Outcome
- K+/Na+ homeostasise0
- Qualifier
- Na+ uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress increased Na+ uptake, which in turn disrupted K+/Na+ homeostasis in all grafting combinations”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
Salt stress significantly decreased photosynthetic capacity, chlorophyll concentration and photosystem II photochemical efficiency in all grafts.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Treatment
- salt stresse0
- Outcome
- photosynthetic capacity, chlorophyll concentration, and photochemical efficiency of photosystem IIe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic capacity, chlorophyll concentration, and photochemical efficiency of photosystem II of all grafts significantly decreased with salt stress”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
G and P2 rootstocks conferred higher resistance than W and P1 rootstocks.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Material
- G and P2e0
- Outcome
- resistancee0
- Direction
- highere0
- Comparator
- W and P1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“W grafted onto G and P2 showed higher resistance than W grafted onto W and P1”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
Grafting and salt stress significantly affected electrolyte leakage and four antioxidant enzyme activities.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Treatment
- grafting and salt stresse0
- Outcome
- Electrolyte leakage (EL) superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrolyte leakage (EL) superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase activity were significantly affected by both grafting and salt stress”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
W/P2 had minimum electrolyte leakage.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Material
- W/P2e0
- Outcome
- ELe0
- Direction
- Minimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Minimum EL was observed in W/P2”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
W/P2 exhibited superior antioxidative capacity.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Material
- W/P2e0
- Outcome
- antioxidative capacitye0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“W/P2, which also exhibited superior antioxidative capacity”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
P2 grafts accumulated less Na+ than grafts on other rootstocks.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Material
- P2e0
- Outcome
- Na+e0
- Direction
- lesse0
- Comparator
- the other rootstockse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grafted onto salt-resistant P2 accumulated less Na+ and reactive oxygen species (ROS) and exhibited superior growth, photosynthesis, and ROS-scavenging capacity compared to those grafted onto the other rootstocks”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
P2 grafts accumulated less ROS than grafts on other rootstocks.
- Taxon
- Citrullus lanatusCitrullus lanatuse1
- Material
- P2e0
- Outcome
- reactive oxygen species (ROS)e0
- Direction
- lesse0
- Comparator
- the other rootstockse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grafted onto salt-resistant P2 accumulated less Na+ and reactive oxygen species (ROS) and exhibited superior growth, photosynthesis, and ROS-scavenging capacity compared to those grafted onto the other rootstocks”
e1“Citrullus lanatus ‘Jingxin No.2’”
Claim · model-written summary
P2 grafts had superior growth, photosynthesis and ROS-scavenging capacity relative to other rootstocks.
- Taxon
- Citrullus lanatusCitrullus lanatuse2
- Material
- P2e1
- Outcome
- growth, photosynthesis, and ROS-scavenging capacitye0
- Direction
- superiore0
- Comparator
- the other rootstockse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exhibited superior growth, photosynthesis, and ROS-scavenging capacity compared to those grafted onto the other rootstocks”
e1“salt-resistant P2”
e2“Citrullus lanatus ‘Jingxin No.2’”
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