Regulation of tillering in sorghum: environmental effects

Kim, Hae Koo; Oosterom, Erik van; Dingkuhn, Michaël; Luquet, Delphine; Hammer, Graeme

doi:10.1093/aob/mcq079

Cited by 82 publications

(89 citation statements)

References 49 publications

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“…However, significant genotype Â season interactions, especially between earlier (October 2011-12) and later plantings (November 2010-11 and2012-13), indicated that variability in photoperiod or temperature sensitivity could have affected canopy development (e.g. Bos and Neuteboom 1998;Kim et al 2010aKim et al , 2010bvan Oosterom et al 2011). Leaf expansion is also known to be sensitive to VPD (e.g.…”

Section: Observed Variability In Traits Affecting Plant Water Usementioning

confidence: 99%

Modelling the effect of plant water use traits on yield and stay-green expression in sorghum

Kholová

Murugesan

Kaliamoorthy

et al. 2014

Functional Plant Biol.

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Abstract. Post-rainy sorghum (Sorghum bicolor (L.) Moench) production underpins the livelihood of millions in the semiarid tropics, where the crop is affected by drought. Drought scenarios have been classified and quantified using crop simulation. In this report, variation in traits that hypothetically contribute to drought adaptation (plant growth dynamics, canopy and root water conducting capacity, drought stress responses) were virtually introgressed into the most common post-rainy sorghum genotype, and the influence of these traits on plant growth, development, and grain and stover yield were simulated across different scenarios. Limited transpiration rates under high vapour pressure deficit had the highest positive effect on production, especially combined with enhanced water extraction capacity at the root level. Variability in leaf development (smaller canopy size, later plant vigour or increased leaf appearance rate) also increased grain yield under severe drought, although it caused a stover yield trade-off under milder stress. Although the leaf development response to soil drying varied, this trait had only a modest benefit on crop production across all stress scenarios. Closer dissection of the model outputs showed that under water limitation, grain yield was largely determined by the amount of water availability after anthesis, and this relationship became closer with stress severity. All traits investigated increased water availability after anthesis and caused a delay in leaf senescence and led to a 'stay-green' phenotype. In conclusion, we showed that breeding success remained highly probabilistic; maximum resilience and economic benefits depended on drought frequency. Maximum potential could be explored by specific combinations of traits.

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Section: Observed Variability In Traits Affecting Plant Water Usementioning

confidence: 99%

Modelling the effect of plant water use traits on yield and stay-green expression in sorghum

Kholová

Murugesan

Kaliamoorthy

et al. 2014

Functional Plant Biol.

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“…The final area of main shoot leaves 5 and 9 was obtained for the same plants from their final length and maximum width, multiplied by a shape factor of 0.69 (Kim et al 2010b). A generic measure of the increase in size of successive leaves between leaves 5 and 9 was obtained as the leaf length increase rate ) and leaf width increase rate ).…”

Section: Phenotypic Trait Measurementmentioning

confidence: 99%

QTL analysis in multiple sorghum populations facilitates the dissection of the genetic and physiological control of tillering

Alam

Mace²,

Oosterom

et al. 2014

Theor Appl Genet

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target environments. The aims of this study were to identify QTL for tillering and component traits associated with the S/D balance or PTT, to develop a framework model for the genetic control of tillering in sorghum. Four mapping populations were grown in a number of experiments in south east Queensland, Australia. The QTL analysis suggested that the contribution of traits associated with either the S/D balance or PTT to the genotypic differences in tillering differed among populations. Thirty-four tillering QTL were identified across the populations, of which 15 were novel to this study. Additionally, half of the tillering QTL co-located with QTL for component traits. A comparison of tillering QTL and candidate gene locations identified numerous coincident QTL and gene locations across populations, including the identification of common non-synonymous SNPs in the parental genotypes of two mapping populations in a sorghum homologue of MAX1, a gene involved in the control of tiller bud outgrowth through the production of strigolactones. Combined with a framework for crop physiological processes that underpin genotypic differences in tillering, the co-location of QTL for tillering and component traits and candidate genes allowed the development of a framework QTL model for the genetic control of tillering in sorghum.

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“…Similar increased vigour during early growth, evident in greater leaf appearance rate, has also been associated with a decrease in tiller number in ATx642, which is the donor parent of the Stg1-4 introgressions, compared to AQL39, a senescent hybrid (van Oosterom et al, 2011). It is thought that competition for carbon between early leaves and tillers lead to this suppression in tillering in genotypes with greater LAR or increased size of early leaves (Alam et al, 2014;Kim et al, 2010). In accordance with this, reducing carbon supply by removing leaves (and therefore photo-assimilate) also led to a reduction in tillering (Kebrom and Mullet, 2015).…”

Section: Discussionmentioning

confidence: 90%

Bigger is not always better: Reducing leaf area helps stay-green sorghum use soil water more slowly

George‐Jaeggli

Mortlock

Borrell

2017

Environmental and Experimental Botany

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A B S T R A C TStay-green, a trait that confers delayed leaf senescence and improved grain yield under post-anthesis drought, has been associated with smaller canopies at flowering and increased water uptake during the post-flowering period. It has been shown that the main stay-green quantitative trait loci reduce leaf area via reduced tiller number and smaller leaves. To show that these canopy characteristics are directly linked to water savings, we grew near-isogenic lines with and without stay-green introgressions in large lysimeter pots and measured their weekly pre-anthesis water use and main-stem and tiller leaf area. Paradoxically, age-related senescence of lower leaves in stay-green lines was accelerated before flowering, contributing to their smaller leaf area at flowering. This process of reducing leaf area by shedding old leaves lower in the canopy, has not previously been described for the stay-green introgressions. We found that tiller leaf area rather than transpiration efficiency, or transpiration per leaf area, was the main driver of weekly transpiration and the reduced pre-flowering water use in stay-green lines. In soils with good water-holding capacity, any water savings during the pre-anthesis period increases water availability during the post-anthesis period, therefore allowing plants to retain photosynthetic capacity for longer by "staying green" during grain filling.Crown

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Regulation of tillering in sorghum: environmental effects

Abstract: This result was consistent with the hypothesis that internal plant competition for assimilates regulates tillering in sorghum. Hence, the framework outlined has a predictive value that could provide the basis for dynamic simulation of tillering in crop growth models.

Cited by 82 publications

References 49 publications

Modelling the effect of plant water use traits on yield and stay-green expression in sorghum

Modelling the effect of plant water use traits on yield and stay-green expression in sorghum

QTL analysis in multiple sorghum populations facilitates the dissection of the genetic and physiological control of tillering

Bigger is not always better: Reducing leaf area helps stay-green sorghum use soil water more slowly

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