Breeding Strategies to Enhance Drought Tolerance in Crops

Rauf, Saeed; Al-Khayri, Jameel M.; Zaharieva, M.; Monneveux, Philippe; Khalil, Farghama

doi:10.1007/978-3-319-22518-0_11

Cited by 61 publications

(55 citation statements)

References 192 publications

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“…However, in a nonirrigated dryland cropping system, the changes in stomatal conductivity associated with the increased atmospheric CO 2 concentrations may help reduce drought stress and even increase PUE (Fischer et al, 1998; Yang et al, 2016). Similarly, recent developments in understanding breeding strategies and genetic engineering that can provide drought tolerant crop cultivars (Yang et al, 2010, Rauf et al, 2016) is beginning to show promise in helping producers adapt to climate change and improve yields (Thierfelder et al, 2016). These cultivars may also be designed around producing increased root biomass to access available soil water, adding the potential co‐benefit of increased C inputs to soil (e.g., Advanced Research Projects Agency‐Energy, 2016).…”

Section: Resultsmentioning

confidence: 99%

Climate Change Impacts on Yields and Soil Carbon in Row Crop Dryland Agriculture

Robertson

Zhang²,

Sherrod

et al. 2018

J of Env Quality

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Dryland agroecosystems could be a sizable sink for atmospheric carbon (C) due to their spatial extent and level of degradation, providing climate change mitigation. We examined productivity and soil C dynamics under two climate change scenarios (moderate warming, representative concentration pathway [RCP] 4.5; and high warming, RCP 8.5), using long-term experimental data and the DayCent process-based model for three sites with varying climates and soil conditions in the US High Plains. Each site included a no-till cropping intensity gradient introduced in 1985, with treatments ranging from wheat-fallow (Triticum aestivum L.) to continuous annual cropping and perennial grass. Simulations were extended to 2100 using data from 16 global circulation models to estimate uncertainty. Simulated yields declined for all crops (up to 50% for wheat), with small changes after 2050 under RCP 4.5 and continued losses to 2100 under RCP 8.5. Of the cropped systems, continuous cropping had the highest average productivity and soil C sequestration rates (78

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Section: Resultsmentioning

confidence: 99%

Climate Change Impacts on Yields and Soil Carbon in Row Crop Dryland Agriculture

Robertson

Zhang²,

Sherrod

et al. 2018

J of Env Quality

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“…Relationship between drought resistant traits and morphological traits such as SMH, OC and TSM were insignificant, which showed that drought resistant traits did not reduce seed yield under normal conditions. This, combined with a positive relationship with morphological traits under stressed conditions is the desirable outcome to benefit sunflower yield in both drought stressed and drought free years (Rauf et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Sunflower ( Helianthus annuus L.) is an important oilseed crop, but its yield is threatened due to various biotic and abiotic stresses, including drought stress (Hussain et al, ; Hussain, Rauf, Riaz, Al‐Khayri, & Monneveux, ; Shehbaz et al, ). Drought is a leading abiotic stress factor in field crops (Rauf, Al‐Khayri, Zaharieva, Monneveux, & Khalil, ). The continuous rise in air temperature due to increased greenhouse gases (climate change) may further increase risk of drought and water shortages, just as higher evaporation may increase canopy transpiration and thus crop water demand (Kalyar, Rauf, & Teixeira da Silva, ).…”

Section: Introductionmentioning

confidence: 99%

Development of drought‐tolerant breeding lines derived from Helianthus annuus × H. argophyllus interspecific crosses

2019

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Helianthus argophyllus is a wild species known as “silver sunflower”, which possesses several traits, including morphological traits that increase drought tolerance. Therefore, introgressions between chosen cultivated lines and two H. argophyllus accessions were made, and segregating generations were established. Important agronomic traits including single heading, high pollen fertility, silver canopy (indicating more cuticular wax), and content of cuticular waxes and oil were selected over six segregating generations. The resulting F6 lines showed introgression of water saving traits, as they had lower excise leaf water loss, with comparable yield to standard checks. However, these F6 lines were late maturing and showed poor flowering synchronization between the cultivated and introgressed lines. Introgressed line “D‐22” was particularly promising as a breeding line, with superior agronomic and drought resistance traits. This line had the potential to be used as an inbred parental line for introgression of drought resistance traits into elite sunflower germplasm. Combining ability analysis of the introgressed lines further showed their potential for heterosis breeding or to be used as parental lines in breeding programme.

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“…According to Rauf et al (2016), this dehydration avoidance mechanism was brought by two possible ways by altering the leaf tissue structure. They are by bulliform cells which are adaxial cells in the epidermis of the leaf and large hypodermal cells shrinking due to loss of water or to a differential distribution of schlerenchyma cells.…”

Section: Resultsmentioning

confidence: 99%