Abstract
Understanding the alterations to the shoot and root traits of rapeseed (Brassica napus) in response to salt stress is vital for improving its ability to thrive in saline-prone regions. This research aims to evaluate the responses of shoot and root traits of rapeseed at the vegetative stage under salt- and salicylic acid-induced stress in hydroponic culture. Five parents and ten F3 segregants of rapeseed were subjected to three treatments: T1: control, T2: 8 dSm−1 salt, and T3: 8 dSm−1 salt + 0.1 mM salicylic acid at 21 days of age. Salinity stress significantly reduced the estimated root surface area by 54% compared to control, highlighting the plasticity of roots under stress. The simultaneous application of salt and SA did not alleviate the salinity stress, but rather reinforced the degree of stress and decreased the number of leaves, diameter of the main axis, chlorophyll content, and estimated root surface area by 18.5%, 15.4%, 38.8%, and 23%, respectively, compared to T2. The parental genotype M-245 followed by F3 genotype M-232×M-223 accounted for the higher overall estimated root surface area. These results provide novel insights into the responses of root traits in rapeseed breeding lines under dual treatment, which hold promising implications for future rapeseed breeding efforts focused on sustainable rapeseed production.
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Claims 6
Claim · model-written summary
Salinity reduced estimated root surface area by 54% relative to control.
Verbatim
e0“Salinity stress significantly reduced the estimated root surface area by 54% compared to control”
t0“Rapeseed”
Claim · model-written summary
Salt plus salicylic acid reduced leaf number by 18.5% relative to salt alone.
Verbatim
e0“decreased the number of leaves, diameter of the main axis, chlorophyll content, and estimated root surface area by 18.5%, 15.4%, 38.8%, and 23%, respectively, compared to T2”
e1“The simultaneous application of salt and SA”
t0“Rapeseed”
Claim · model-written summary
Salt plus salicylic acid reduced main-axis diameter by 15.4% relative to salt alone.
Verbatim
e0“decreased the number of leaves, diameter of the main axis, chlorophyll content, and estimated root surface area by 18.5%, 15.4%, 38.8%, and 23%, respectively, compared to T2”
e1“The simultaneous application of salt and SA”
t0“Rapeseed”
Claim · model-written summary
Salt plus salicylic acid reduced chlorophyll content by 38.8% relative to salt alone.
Verbatim
e0“decreased the number of leaves, diameter of the main axis, chlorophyll content, and estimated root surface area by 18.5%, 15.4%, 38.8%, and 23%, respectively, compared to T2”
e1“The simultaneous application of salt and SA”
t0“Rapeseed”
Claim · model-written summary
Salt plus salicylic acid reduced estimated root surface area by 23% relative to salt alone.
Verbatim
e0“decreased the number of leaves, diameter of the main axis, chlorophyll content, and estimated root surface area by 18.5%, 15.4%, 38.8%, and 23%, respectively, compared to T2”
e1“The simultaneous application of salt and SA”
t0“Rapeseed”
Claim · model-written summary
M-245 had the highest overall estimated root surface area, followed by M-232×M-223.
Verbatim
e0“The parental genotype M-245 followed by F3 genotype M-232×M-223 accounted for the higher overall estimated root surface area”
t0“Rapeseed”
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