Abstract
Highlights- ES Hydromel as a new hybrid cultivar under late-season drought stress conditions is proposed in cold temperate regions with arid and semi-arid climates. - Late sowing date has extremely caused a negative effect on the winter rapeseed’s physiological traits during the cold season. - The result of cluster analysis based on grain yield loss led to the formation of two clusters, which ES Hydromel and ES Alonso with lower yield loss were grouped in the tolerant cluster. - ES Hydromel in the late planting date and irrigation interruption conditions obtained the lowest stomatal resistance. - ES Hydromel on regular date and normal irrigation conditions obtained the highest leaf relative water content. The adverse effects of abiotic stresses have always restricted oilseed crop production, particularly in arid and semi-arid regions. On the other side, global climate change has led us to adapt planting dates and select tolerant cultivars to encounter the new climatic conditions. To evaluate the effect of late-season drought stress under different planting dates on rapeseed cultivars, an experiment was conducted as a factorial split-plot based on randomised complete block design in Karaj region-Iran, during 2015-2017. Planting date and irrigation treatments were considered in the main plots as factorial and cultivars were placed in subplots. Two planting dates were regular date (October 7) (PD1) and late planting date (November 6). Irrigation was also carried out at two levels of normal irrigation (NI) and irrigation interruption from flowering stage onwards. Experimental cultivars included ES Hydromel, ES Alonso, ES Darko, ES Lauren, and Ahmadi. According to the results, late-season drought stress and delayed planting date reduced leaf relative water content (LRWC), total chlorophyll content, proline, and grain yield, and increased stomatal resistance (SR), canopy temperature, and leaf soluble carbohydrates (CLS) in rapeseed cultivars. The highest grain yield (4505.6 kg ha–1) was obtained in NI conditions and PD1. Significant interactions of planting date, irrigation, and cultivar on LRWC, SR, and CLS traits indicated that the ES Hydromel was the most tolerant hybrid cultivar with the highest LRWC and the lowest SR and CLS levels compared to other ones in unfavourable conditions of late-season drought stress and delayed planting. To confirm these results, cluster analysis led to the formation of two clusters, where ES Darko, Ahmadi, and ES Lauren cultivars were placed in the sensitive cluster and ES Hydromel and ES Alonso cultivars were assigned to the tolerant cluster. Therefore, ES Hydromel can be introduced as a superior cultivar to be selected as a genotype that presents acceptable resistance under drought stress and late sowing in arid and semi-arid regions.
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Claims 13
Claim · model-written summary
Late-season drought and delayed planting reduced leaf relative water content, total chlorophyll content and proline in rapeseed cultivars.
- Taxon
- rapeseedt0
- Treatment
- late-season drought stress and delayed planting datee0
- Outcome
- leaf relative water content (LRWC), total chlorophyll content, prolinee0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“late-season drought stress and delayed planting date reduced leaf relative water content (LRWC), total chlorophyll content, proline, and grain yield”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Late-season drought and delayed planting reduced rapeseed grain yield.
- Taxon
- rapeseedt0
- Treatment
- late-season drought stress and delayed planting datee0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“late-season drought stress and delayed planting date reduced leaf relative water content (LRWC), total chlorophyll content, proline, and grain yield”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Late-season drought and delayed planting increased stomatal resistance, canopy temperature and leaf soluble carbohydrates.
- Taxon
- rapeseedt0
- Treatment
- late-season drought stress and delayed planting datee1
- Outcome
- stomatal resistance (SR), canopy temperature, and leaf soluble carbohydrates (CLS)e0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased stomatal resistance (SR), canopy temperature, and leaf soluble carbohydrates (CLS) in rapeseed cultivars.”
e1“late-season drought stress and delayed planting date reduced”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Normal irrigation on the regular planting date produced the highest grain yield, 4505.6 kg ha–1.
Verbatim
e0“The highest grain yield (4505.6 kg ha–1) was obtained in NI conditions and PD1.”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Planting date, irrigation and cultivar interacted significantly for leaf relative water content.
Not reportedDirection
Verbatim
e0“Significant interactions of planting date, irrigation, and cultivar on LRWC, SR, and CLS traits”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Planting date, irrigation and cultivar interacted significantly for stomatal resistance.
Not reportedDirection
Verbatim
e0“Significant interactions of planting date, irrigation, and cultivar on LRWC, SR, and CLS traits”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Planting date, irrigation and cultivar interacted significantly for leaf soluble carbohydrates.
Not reportedDirection
Verbatim
e0“Significant interactions of planting date, irrigation, and cultivar on LRWC, SR, and CLS traits”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
ES Hydromel had the highest leaf relative water content under late drought and delayed planting.
Verbatim
e0“ES Hydromel was the most tolerant hybrid cultivar with the highest LRWC and the lowest SR and CLS levels compared to other ones in unfavourable conditions of late-season drought stress and delayed planting.”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
ES Hydromel had the lowest stomatal resistance under late drought and delayed planting.
Verbatim
e0“ES Hydromel was the most tolerant hybrid cultivar with the highest LRWC and the lowest SR and CLS levels compared to other ones in unfavourable conditions of late-season drought stress and delayed planting.”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
ES Hydromel had the lowest leaf soluble carbohydrate level under late drought and delayed planting.
Verbatim
e0“ES Hydromel was the most tolerant hybrid cultivar with the highest LRWC and the lowest SR and CLS levels compared to other ones in unfavourable conditions of late-season drought stress and delayed planting.”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Cluster analysis grouped ES Darko, Ahmadi and ES Lauren as drought-sensitive cultivars.
Not reportedDirection
Verbatim
e0“ES Darko, Ahmadi, and ES Lauren cultivars were placed in the sensitive cluster”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Cluster analysis grouped ES Hydromel and ES Alonso as drought-tolerant cultivars.
Not reportedDirection
Verbatim
e0“ES Hydromel and ES Alonso cultivars were assigned to the tolerant cluster”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
The authors propose ES Hydromel for drought stress and late sowing in arid and semi-arid regions.
Verbatim
e0“ES Hydromel can be introduced as a superior cultivar to be selected as a genotype that presents acceptable resistance under drought stress and late sowing in arid and semi-arid regions.”
t0“rapeseed (Brassica napus L.)”
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