AustralieFrV1, Main, Curation, bibRecord, 007068

Regulation of tillering in sorghum: environmental effects

Identifieur interne : 007068 ( Main/Curation ); précédent : 007067; suivant : 007069

Regulation of tillering in sorghum: environmental effects

Auteurs : Hae Koo Kim [Australie, France] ; Erik Van Oosterom [Australie] ; Michael Dingkuhn [France] ; Delphine Luquet [France] ; Graeme Hammer [Australie]

Source :

Annals of Botany [ 0305-7364 ] ; 2010-07.

RBID : ISTEX:5B16CB6B6BFC86D159BE5B5DDF038013638E0189

Abstract

Background and Aims Tillering has a significant effect on canopy development and, hence, on resource capture, crop growth and grain yield in sorghum. However, the physiological basis of tillering and its regulation by environmental effects are not fully understood. The objective of this study was to understand and quantify the environmental effects on tillering in sorghum using a carbohydrate supply–demand framework. Methods A series of five experiments with a wide range of radiation and temperature conditions was conducted and details of the tillering responses of a single representative hybrid were monitored. The concept of internal plant competition for carbohydrate was developed for analysis of these responses. Key Results Tiller appearance was highly synchronized with main shoot leaf appearance, with a consistent hierarchy for tillering across environments. The main environmental effect was on the frequency of tiller appearance, in particular of the lower-rank tillers. This explained some of the observed environmental differences in the onset of tillering. A generalized index of internal plant competition, which took account of plant assimilate supply and demand (S/Dindex) during the critical period for tillering, explained most of the variation in maximum tiller number observed across the five experiments. Conclusions 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.

Url:

DOI: 10.1093/aob/mcq079

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Graeme Hammer

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Le document en format XML

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<front><div type="abstract">Background and Aims Tillering has a significant effect on canopy development and, hence, on resource capture, crop growth and grain yield in sorghum. However, the physiological basis of tillering and its regulation by environmental effects are not fully understood. The objective of this study was to understand and quantify the environmental effects on tillering in sorghum using a carbohydrate supply–demand framework. Methods A series of five experiments with a wide range of radiation and temperature conditions was conducted and details of the tillering responses of a single representative hybrid were monitored. The concept of internal plant competition for carbohydrate was developed for analysis of these responses. Key Results Tiller appearance was highly synchronized with main shoot leaf appearance, with a consistent hierarchy for tillering across environments. The main environmental effect was on the frequency of tiller appearance, in particular of the lower-rank tillers. This explained some of the observed environmental differences in the onset of tillering. A generalized index of internal plant competition, which took account of plant assimilate supply and demand (S/Dindex) during the critical period for tillering, explained most of the variation in maximum tiller number observed across the five experiments. Conclusions 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.</div>
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<sourceDesc><biblStruct><analytic><title level="a">Regulation of tillering in sorghum: genotypic effects</title>
<author><name sortKey="Kim, Hae Koo" sort="Kim, Hae Koo" uniqKey="Kim H" first="Hae Koo" last="Kim">Hae Koo Kim</name>
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<wicri:regionArea>The University of Queensland, School of Land, Crop and Food Sciences, Brisbane, QLD 4072</wicri:regionArea>
<wicri:noRegion>QLD 4072</wicri:noRegion>
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<placeName><region type="region" nuts="2">Occitanie (région administrative)</region>
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<settlement type="city">Montpellier</settlement>
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<author><name sortKey="Luquet, Delphine" sort="Luquet, Delphine" uniqKey="Luquet D" first="Delphine" last="Luquet">Delphine Luquet</name>
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<wicri:regionArea>The University of Queensland, School of Land, Crop and Food Sciences, Brisbane, QLD 4072</wicri:regionArea>
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<author><name sortKey="Hammer, Graeme" sort="Hammer, Graeme" uniqKey="Hammer G" first="Graeme" last="Hammer">Graeme Hammer</name>
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<wicri:regionArea>The University of Queensland, School of Land, Crop and Food Sciences, Brisbane, QLD 4072</wicri:regionArea>
<wicri:noRegion>QLD 4072</wicri:noRegion>
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<affiliation wicri:level="1"><country wicri:rule="url">Australie</country>
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<series><title level="j">Annals of Botany</title>
<idno type="ISSN">0305-7364</idno>
<idno type="eISSN">1095-8290</idno>
<imprint><publisher>Oxford University Press</publisher>
<date type="published" when="2010-07">2010-07</date>
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<front><div type="abstract">Background and Aims Genotypic variation in tillering can be caused by differences in the carbon supply–demand balance within a plant. The aim of this study was to understand and quantify the effects of genotype on tillering as a consequence of the underlying internal competition for carbohydrates. Methods Five sorghum hybrids, derived from inbred lines with a common genetic background and with similar phenology and plant height but contrasting tillering, were grown in five experiments. The experiments covered a wide range in radiation and temperature conditions, so that number of tillers produced varied significantly. Data on leaf area, tiller number, and biomass accumulation and partitioning were collected at regular intervals. To quantify internal plant competition for carbohydrates, a carbohydrate supply–demand index (S/Dindex) was developed and related to variation in tillering. Key Results The appearance of main shoot leaves and tillers was highly co-ordinated across genotypes. High-tillering hybrids had a greater appearance frequency of early tiller ranks than low-tillering hybrids, and this was associated with narrower and hence smaller main shoot leaves. A generalized S/Dindex of internal plant competition accounted for most of the observed variation in maximum tiller number (Ntiller,max) across genotypes. However, genotypic differences in the relationship between the S/Dindex and Ntiller,max suggested that high-tillering hybrids also had a lower S/D threshold at which tillers appeared, possibly associated with hormonal effects. Conclusions The results support the hypothesis that genotypic differences in tillering were associated with differences in plant carbon S/D balance, associated with differences in leaf size and in the threshold at which tillers grow out. The results provide avenues for phenotyping of mapping populations to identify genomic regions regulating tillering. Incorporating the results in crop growth simulation models could provide insight into the complex genotype-by-management-by-environment interactions associated with drought adaptation.</div>
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Regulation of tillering in sorghum: environmental effects

Regulation of tillering in sorghum: environmental effects

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