Abstract
The introduction of new genotypes of crop plants is among the most strategic research programmes, especially in arid and semi-arid regions. To study the effect of drought stress on seed yield and some physiological traits of promising lines of rapeseed at different sowing dates, an experiment was conducted for two years (2015-2017) in a semi-arid region of Iran. In this research, two conventional sowing dates were set in October 12 and November 1 (late sowing). Irrigation was carried out at two levels: normal irrigation (control) and irrigation interruption from the silique formation stage to the next stage (late-season drought stress). The genotypes included four promising lines (L1112, L1091, L1093, L1206), and a cultivar (Okapi) as a control. Results showed that delayed sowing and drought stress increased carbohydrate content and decreased seed yield, with the highest carbohydrate content and highest yield loss in L1112 and the lowest carbohydrate and lowest yield loss in the L1206 line. Among the physiological traits measured, stomatal resistance had the highest degree of correlation and the highest direct negative effect on seed yield, which declined with increasing stomatal resistance. L1112 had the highest stomatal resistance (52.76 s cm -1 ) in delayed sowing and drought stress conditions. Therefore, L1206 and L1112 were revealed to be resistant and sensitive lines, respectively.
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Claims 8
Claim · model-written summary
Delayed sowing and drought stress increased carbohydrate content in rapeseed lines.
- Taxon
- rapeseedt0
- Treatment
- delayed sowing and drought stresse1
- Outcome
- carbohydrate contente1
- Direction
- increasede1
- Setting
- semi-arid region of Irane0
Not reportedComparator
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e0“an experiment was conducted for two years (2015-2017) in a semi-arid region of Iran”
e1“delayed sowing and drought stress increased carbohydrate content and decreased seed yield”
Claim · model-written summary
Delayed sowing and drought stress decreased seed yield of rapeseed lines.
- Taxon
- rapeseedt0
- Treatment
- delayed sowing and drought stresse1
- Outcome
- seed yielde1
- Direction
- decreasede1
- Setting
- semi-arid region of Irane0
Not reportedComparator
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e0“an experiment was conducted for two years (2015-2017) in a semi-arid region of Iran”
e1“delayed sowing and drought stress increased carbohydrate content and decreased seed yield”
Claim · model-written summary
Line L1112 had the highest carbohydrate content and highest yield loss.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e2“with the highest carbohydrate content and highest yield loss in L1112 and the lowest carbohydrate and lowest yield loss in the L1206 line”
Claim · model-written summary
Line L1206 had the lowest carbohydrate content and lowest yield loss.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e2“with the highest carbohydrate content and highest yield loss in L1112 and the lowest carbohydrate and lowest yield loss in the L1206 line”
Claim · model-written summary
Stomatal resistance had the highest degree of correlation with seed yield and the highest direct negative effect on it.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e3“stomatal resistance had the highest degree of correlation and the highest direct negative effect on seed yield”
Claim · model-written summary
Line L1112 had the highest stomatal resistance (52.76 s cm -1) under delayed sowing and drought stress.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e4“L1112 had the highest stomatal resistance (52.76 s cm -1 ) in delayed sowing and drought stress conditions”
Claim · model-written summary
Line L1206 was revealed to be drought resistant.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e5“L1206 and L1112 were revealed to be resistant and sensitive lines, respectively”
Claim · model-written summary
Line L1112 was revealed to be drought sensitive.
Verbatim
t0“promising lines of rapeseed (Brassica napus L.)”
e5“L1206 and L1112 were revealed to be resistant and sensitive lines, respectively”
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