A tillering inhibition gene influences root–shoot carbon partitioning and pattern of water use to improve wheat productivity in rainfed environments

Hendriks, Pieter‐Willem; Kirkegaard, John A.; Lilley, Julianne M.; Gregory, P. J.; Rebetzke, G. J.

doi:10.1093/jxb/erv457

Cited by 47 publications

(47 citation statements)

References 47 publications

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“…Genetic studies in wheat indicate that mutation in the Tiller inhibition ( Tin ) gene results in lower numbers of tillers but a higher ratio of productive tillers, to total tiller number, as well as larger spikes and grains (Moeller et al and references therein; Hendriks et al ). Duggan et al () proposed tiller reduction with the tin gene to improve production under terminal drought conditions, taking advantage of the reduction in non‐productive tillers and a limited consumption of soil water before anthesis.…”

Section: Implications For Breedingmentioning

confidence: 99%

Genetics of barley tiller and leaf development

Shaaf

Bretani

Biswas

et al. 2019

JIPB

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In cereals, tillering and leaf development are key factors in the concept of crop ideotype, introduced in the 1960s to enhance crop yield, via manipulation of plant architecture. In the present review, we discuss advances in genetic analysis of barley shoot architecture, focusing on tillering, leaf size and angle. We also discuss novel phenotyping techniques, such as 2D and 3D imaging, that have been introduced in the era of phenomics, facilitating reliable trait measurement. We discuss the identification of genes and pathways that are involved in barley tillering and leaf development, highlighting key hormones involved in the control of plant architecture in barley and rice. Knowledge on genetic control of traits related to plant architecture provides useful resources for designing ideotypes for enhanced barley yield and performance.

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Section: Implications For Breedingmentioning

confidence: 99%

Genetics of barley tiller and leaf development

Shaaf

Bretani

Biswas

et al. 2019

JIPB

View full text Add to dashboard Cite

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“…Comparison among wheat cultivars with contrasting tillering has been addressed under several conditions, such as sowing dates and densities, plant nutrition and environmental stresses (Duggan et al 2005a, b;Ruan et al 2012;Mitchell et al 2013;Guo and Schnurbusch 2015;Hendriks et al 2016;Houshmandfar et al 2019). Despite all these studies, it remains difficult to dissect the interactions between main stem and tillers regarding source-sink relationships, mainly under stress conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Wheat lines with the Tiller Inhibition (Tin) gene are useful to understand the effects of intraspecific competition and source-sink relationships in wheat plants. However, artificial detillering usually presents more expressive results when compared to Tin plants (Hendriks et al 2016), enabling the determination of the number and the developmental conditions of emitted tillers.…”

Section: Introductionmentioning

confidence: 99%

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Role of nonproductive tillers as transient sinks of assimilates in wheat

et al. 2020

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Although source-sink relationships in wheat are well studied, the performance of tillers as transient sinks is still unclear, especially under stress conditions. Thus, this work aimed to study the yield relationships of wheat stems in contrasting genotypes as affected by tiller treatment under stress conditions. Two experiments were conducted under greenhouse conditions using BRS Guamirim (high tillering) and BRS Parrudo (low tillering) wheat cultivars. Four tillering treatments were applied on late tillers in the first growing season (2016) and three in the second (2017): (i) free-tillering, (ii) detillering, (iii) physical suppression (only in the first season) and (iv) "spikes removal". The main stem and the first four emitted tillers were considered as primary tillers. Plants were submitted to drought (2016) and defoliation stress (2017) at preanthesis. Intraspecific competition among tillers increased under drought stress conditions and decreased the plant performance. Nonproductive late tillers do not improve the performance of primary tillers of wheat plants under drought stress, mainly in high-tillering cultivars. The reduction on the thousand grain weight of only 'Parrudo' detillered plants indicates that assimilate remobilization from late tillers to primary tillers and main stem seems to be more effective in low-tillering cultivars.

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“…It is possible that selection for these secondary traits has also contributed to selection for below-ground traits. For example reduced tillering is has been associated with increased root length, root biomass, and root-to-shoot ratio (Hendriks et al, 2016).…”

Section: Trait-based Approachesmentioning

confidence: 99%

Breeding wheat for drought adaptation: Development of selection tools for root architectural traits

Richard¹

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A crop's ability to explore the soil profile and extract available water at different depths is largely determined by root system architecture. For instance in wheat (Triticum aestivum L.), it has been suggested that a narrow and deep root system can provide better access to deep soil moisture. Such root systems are particularly beneficial for rain-fed regions where crops rely heavily on stored soil moisture at depth, as encountered in the eastern Australian wheat belt. Thus, by targeting desirable root architectural traits, wheat breeders could increase genetic gain for yield in response to the growing demand for food. Yet, selection for these below-ground traits is challenging because roots are difficult to measure and are under complex genetic control. The aim of this project was to develop new phenotypic and molecular selection tools to facilitate selection for root architectural traits in Australian wheat breeding programs targeting terminal moisture stress adaptation. This project focuses on narrow seminal root angle and high number of seminal roots in wheat seedlings; two proxy traits for desirable mature root system architecture. Firstly, to overcome the lack of efficient root screening methods, a high-throughput and cost-effective method for phenotyping seminal root angle and number in wheat was developed, using clear pots in a controlled environment growth facility. Compared to pre-existing phenotyping methods, the newly developed method successfully provided higher heritability, greater repeatability, and better efficiency in terms of time, space, and labour. Further, the clear-pot method revealed a high degree of phenotypic variation for both seminal root traits. Subsequently, to test the ability to introgressed allelic variation for seminal root angle into elite Australian wheat cultivars via phenotypic selection, backcross tail populations for both narrow and wide root angle were developed, using the clear-pot method. Rapid shifts in both population distribution and allele frequency were observed after just two rounds of selection. Further, comparison of the tail populations revealed some genomic regions under selection, for which marker-assisted selection appeared successful. Hence, genetic diversity can be exploited via phenotypic and molecular selection to target desired root system architecture in wheat breeding programs.

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A tillering inhibition gene influences root–shoot carbon partitioning and pattern of water use to improve wheat productivity in rainfed environments

Cited by 47 publications

References 47 publications

Genetics of barley tiller and leaf development

Genetics of barley tiller and leaf development

Role of nonproductive tillers as transient sinks of assimilates in wheat

Breeding wheat for drought adaptation: Development of selection tools for root architectural traits

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