Root efficiency and water use regulation relating to rooting depth of winter wheat

Li, Haotian; Li, Lu; Liu, Na; Chen, Suying; Shao, Lei; Sekiya, Nobuhito; Zhang, Xiying

doi:10.1016/j.agwat.2022.107710

Cited by 19 publications

(9 citation statements)

References 60 publications

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“…There is a well-established link between root distribution in the soil, water access and water use (Robertson et al 1993; Li et al 2022). Further evidence on the role of PIN2 and gravitropism in directing RSA formation in barley comes from functional analysis.…”

Section: Discussionmentioning

confidence: 99%

ThePIN2ortholog in barley modifies root gravitropism and architecture without impacting the shoot

Aldiss,

Robinson,

Lam

et al. 2024

Preprint

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Roots provide the critical interface where plants acquire nutrients and water, but our limited understanding of the genetic controls modulating root system architecture (RSA) in crop species constrains opportunities to develop future cultivars with improved root systems. However, there is vast knowledge of root developmental genes in model plant species, which has the potential to accelerate progress in crops with more complex genomes, particularly given that genome editing protocols are now available for most species. PIN-FORMED2 (PIN2) encodes a root specific polar auxin transporter, where its absence resulted in roots being unable to orient themselves using gravity, producing a significantly wider root system. To explore the role of PIN2 in a cereal crop, we used CRISPR/Cas9 editing to knockout of PIN2 in barley (Hordeum vulgare). Like Arabidopsis, the roots of barley pin2 loss-of-function mutants displayed an agravitropic response at seedling growth stages, resulting in a significantly shallower and wider root system at later growth stages. Notably, despite the significant change in RSA, there was no change in shoot architecture or total shoot biomass. We discuss the future challenges and opportunities to harness the PIN2 pathway to optimise RSA in crops for a range of production scenarios without a shoot trade-off.

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Section: Discussionmentioning

confidence: 99%

ThePIN2ortholog in barley modifies root gravitropism and architecture without impacting the shoot

Aldiss,

Robinson,

Lam

et al. 2024

Preprint

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“…Cultivars that had the ability to reduce soil water use during vegetative stages can increase available soil water during anthesis and grain filling. Improved soil water availability during reproductive stages increased the photosynthetic rate and leaf chlorophyll, which enhanced biomass accumulation [20]. This explains why the higher soil water consumption after anthesis of high-yielding cultivars leads to greater post-anthesis dry matter accumulation than that of low-yielding cultivars, particularly in rainfed conditions.…”

Section: Increasing Soil Water Use In Deep Soil Layers After Anthesis...mentioning

confidence: 99%

“…Previous studies also indicated that water use during grain filling has a very high conversion efficiency into grain (water use efficiency) [31,54]. Some studies have indicated that most of the increase in grain yield from subsoil water use during the late growth stages was associated with increases in the harvest index (HI) of the crop [20,62]. High-yielding cultivars, which had a higher proportion of water use during the reproductive stage, not only increased dry matter accumulation but also promoted its transfer to the grain of winter wheat [12].…”

Section: Increasing Soil Water Use In Deep Soil Layers After Anthesis...mentioning

confidence: 99%

“…Our previous studies have revealed high variation in the root system traits of modern wheat cultivars [19]. A smaller root length density (RLD) in the deep soil profile can restrict crop water use, resulting in more soil water being left unused at harvest [20]. Cultivars with greater root biomass and greater RLD in deeper soil layers exhibited enhanced soil water absorption after anthesis, contributing to high grain yield [21], while, a large root system in top soil layers can result in excessive water use during vegetative stages, having a negative influence on grain yield [22].…”

Section: Introductionmentioning

confidence: 99%

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Water Use Strategies and Shoot and Root Traits of High-Yielding Winter Wheat Cultivars under Different Water Supply Conditions

Fang,

Zhang,

et al. 2024

Agronomy

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Drought is the most important factor limiting winter wheat yield in the North China Plain (NCP). Choosing high-yielding cultivars is an important measure to minimize the negative effects of drought stress. Field studies were conducted with 10 cultivars in the 2020–2022 seasons under three irrigation treatments (I0, without irrigation; I1, irrigated at jointing stage; I2, irrigated at jointing and anthesis stages) in the NCP to examine the water use strategies and root and shoot traits of high-yielding cultivars under different water supply conditions. The results showed that yield variation among cultivars was 21.2–24.6%, 23.7–25.9% and 11.6–15.3% for the I0, I1 and I2 treatments, respectively. Under water deficit conditions (I0 and I1), high-yielding cultivars reduced water use during vegetative stages and increased soil water use during reproductive stages, especially water use from deeper soil layers. Those cultivars with higher root length density (RLD) in deep soil layers exhibited higher water uptake. Each additional millimeter of water used after anthesis from the 100–200 cm soil layers increased grain yield by 23.6–29.6 kg/ha and 16.4–28.5 kg/ha under I0 and I1, respectively. This water use strategy enhanced dry matter accumulation after anthesis, decreased canopy temperature (CT) and increased relative leaf water contents (RLWC), which ultimately improved grain yield. For winter wheat grown under I2, cultivars that decreased water use after anthesis had higher water productivity (WP). Root length (RL), root weight (RW) and root:shoot ratio were each negatively correlated with grain yield, while above-ground biomass was positively correlated with grain yield. Therefore, higher dry matter accumulation and smaller root systems are two important traits of high-yielding cultivars under sufficient water supply conditions (I2) in the NCP.

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“…Root biomasses are essential for the balance between aboveground biomass and root biomass, which in turn affects yield (Bettembourg et al 2017;Cormier et al 2016). Root systems respond to different growing environments by changing their morphology and distribution in the soil, which in turn alter water and fertilizer use e ciency, lodging resistance and heat tolerance in wheat (Li et al 2022; Uga et al 2013). Thus, understanding the genetic basis of root architecture could enhance wheat breeding for many important traits.…”

Section: Introductionmentioning

confidence: 99%

Genetic dissection for seedling root-related traits using multiple-methods in bread wheat (Triticum aestivum L.)

Wei,

Hao,

Tao

et al. 2024

Preprint

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The root system of wheat affects water and fertilizer use efficiency, stress tolerance, and agronomic traits. Using association analysis and linkage mapping, QTL associated with 12 seedling-stage root traits were identified with SNPs and SCVs under both hydroponic nutrient solution culture experiment (NCE) and soil culture experiment (SCE). Except for MRL, the root traits of seedlings under NCE and SCE differed significantly. Several seedling indicators, including RFW, RDW and RS, were significantly correlated with adult plant agronomic traits. Identification of RFW, RDW, RS, and RV by NCE is equivalent to SCE for subsequent research. Under NCE, 29 stable loci and 9 SCVs of 12 root traits were detected respectively by SNPs and SCVs association analysis. Under SCE, association analysis detected 23 stable loci with SNPs and 26 loci with SCVs. In the DH population, 21 stable QTL were detected by SNPs linkage analysis, and 6 SCVs were found by SCVs analysis. Co-localization analysis revealed that NCE and SCE simultaneously detected QRdw.sxau-6A, QRd.sxau-1B.2, and QDw.sxau-6A (5.56%-8.76% of R2). Mr1B-3, Mr3A-3 and Mr3A-4 were detected in both NCE and SCE (4.74%-9.07% of R2). In the association panel, SNPs and SCVs co-localized to 14 MTAs, of which Mr5A-6 and QRd.sxau-5A were significantly associated with RD. The association panel and DH population co-located 10 QTL, of which QDw.sxau-1D was stably detected. QDw.sxau-6A and Mg6A-9 overlapped in same genomic location containing candidate genes TraesCS6A02G372300, TraesCS6A02G382900 and TraesCS6A02G365100. The present study contributes novel insights into the genetics of root architecture in wheat.

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Root efficiency and water use regulation relating to rooting depth of winter wheat

Cited by 19 publications

References 60 publications

ThePIN2ortholog in barley modifies root gravitropism and architecture without impacting the shoot

ThePIN2ortholog in barley modifies root gravitropism and architecture without impacting the shoot

Water Use Strategies and Shoot and Root Traits of High-Yielding Winter Wheat Cultivars under Different Water Supply Conditions

Genetic dissection for seedling root-related traits using multiple-methods in bread wheat (Triticum aestivum L.)

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