Tillering in Grain Sorghum over a Wide Range of Population Densities: Identification of a Common Hierarchy for Tiller Emergence, Leaf Area Development and Fertility

Lafarge, Tanguy; Broad, Ian; Hammer, Graeme

doi:10.1093/aob/mcf152

Cited by 97 publications

(71 citation statements)

References 46 publications

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“…The higher tiller mortality rates (located on last developed tillers) along with the negative correlation between maximum tiller number and tiller efficiency despite similar maximum tiller density, suggests that more intense within-plant competition was set likely because of the longer and eventual excessive vegetative development. Since last developed tillers show higher mortality ratios and less yield potential, which is in line with Jaffuel & Dauzat (2005) and for rice and with Lafarge et al (2002) for sorghum, we hypothesize that early start of vegetative development along with inhibition of late tiller emergence might decrease internal competition so that superiority of early vegetative growth could be maintained until reproductive and grain filling stages resulting in higher grain yield. Then, our study indicates that the regulation of rice tillering through promotion of early tillering followed by inhibition of late tillering might optimize rice crop productivity.…”

Section: Discussionsupporting

confidence: 53%

“…Temporal pattern is also relevant for grain yield (Miller et al, 1991) as earlier tiller emergence is advantageous for resource capture (Lafarge et al, 2002) whereas late tillers may cause significant waste of assimilates and thus limit overall yield plant potential . On the other hand, excessive tillering induces tiller abortion, low seed set and small panicle size, leading to reduced grain yield (Peng et al, 1998) as opposed to low tillering which may lead to suboptimal tiller and panicle densities and eventually, reduced grain yield.…”

Section: Methodsmentioning

confidence: 99%

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Tillering and yield formation of a temperate Japonica rice cultivar in a Mediterranean rice agrosystem

Martínez-Eixarch¹,

Catala²,

Tomás³

et al. 2015

Span. j. agric. res.

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Rice tillering is a crucial stage for yield formation. Deep understanding of the relationship between tillering dynamics and yield formation in a particular agrosystem is crucial to boost rice productivity. Research on rice tillering is mainly focused on tropical agrosystems whereas less is done in the Mediterranean, with direct water-seeding and Japonica cultivars. This study aims at characterizing tillering dynamics and identifying the main explanatory tillering traits of yield in a Mediterranean rice agrosystem, Ebro Delta (Northern Spain). A temperate Japonica cultivar grown in Spain, Gleva, was utilized. Plants and tillers were tagged to assess emergence and fertility ratios and grain yield; while changes in tillering number over time, yield and yield components for unit area were measured. Plant and tillering dynamics in the Ebro Delta rice fields can be accurately predicted through equations herein provided, which are based either on thermal time or leaf development. Plants grown under regional standard agricultural practices produced up to eight primary tillers of which two or three become productive. Maximum tiller number was the main explanatory variable of yield while high-yielding tillers within a plant are located on nodes with the highest emergence ratios and, after the main stem, they are the major contributors to yield. The decisive role of tiller development on yield along with the predictability of tiller dynamics raises options to optimize grain yield through tillering modulation. In this sense, results from this study suggests the promotion of early tillering followed by inhibition of late tillering as a strategy of tillering regulation.Additional key words: Oryza sativa L.; tillering dynamics; tiller order; yield formation; emergence; fertility; curve fitting; synchrony

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Section: Discussionsupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Tillering and yield formation of a temperate Japonica rice cultivar in a Mediterranean rice agrosystem

Martínez-Eixarch¹,

Catala²,

Tomás³

et al. 2015

Span. j. agric. res.

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“…Most cereal crops have a stable yield for wide range of plant density because they can respond to availability of resources by adjusting the number of productive tillers (Darwinkel, 1978;Lafarge et al, 2002). Unlike most cereals, corn does not have the same ability to adjust yield for possible occasional inadequacy or availability of resources because modern corn hybrids cannot effectively tiller and often produce one ear per plant (Tokatlidis, 2013).…”

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confidence: 99%

Yield Responses to Planting Density for US Modern Corn Hybrids: A Synthesis‐Analysis

et al. 2016

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Identifying an optimal plant density is a critical management decision for corn (Zea mays L.) production. The main objectives of this study were to: (i) investigate the grain yield responses to plant density (yield–density relationship), (ii) identify best fitted yield–density response curves, and (iii) explore genotype (G) × environment (E) interaction effect on yield–density response models. Analysis was conducted on meta‐data (124,374 observations) gathered from 22 US states and 2 Canadian provinces, diverse sites (E), for years from 2000–2014 on multiple hybrids (G). Yield data were further grouped into four yield environments (low [LY], <7 Mg ha−1; medium [MY], 7–10 Mg ha−1; high [HY], 10–13 Mg ha−1; and very high [VHY], >13 Mg ha−1 yielding groups). Primary outcomes from this analysis were: (1) strong G × E interaction; (2) a quadratic model best fitted yield–density relationship; (3) four contrasting yield–density responses identified as dominant in each yield productivity environment, i.e., a declining, a constant, an increasing, and ever‐increasing type; (4) the yield productivity environment varied for the different corn comparative relative maturity (CRM) groups, i.e., the LY environment for long‐maturing hybrids matched with a MY or HY environment for short maturing hybrids; and (5) maximum yielding plant density (MYPD) was lower but maximum yield was greater for long‐ versus short‐maturing hybrids. In summary, optimal plant density should be decided based on detailed G × E analysis of production conditions that include factors such as CRM, yield productivity environment (weather–soil × management practices), and site information.

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“…We observed variations in tillering ability among the cultivars (Table 1 and 3); however, the occurrence was not consistent within cultivars at different sampling periods. Studies done by Lafarge et al (2002) could not associate tillers with either yield of drought tolerance. However, it is likely that emergence of tillers is genetically controlled and partly serve as a survival mechanism in stress conditions.…”

Section: Resultsmentioning

confidence: 95%

Phenotypic and physiological aspects related to drought tolerance in sorghum

Mutisya¹,

Sitieney²,

Gichuki³

2011

African Crop Science Journal

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Drought is one of the major limitations to crop productivity worldwide. Identifying suitable screening tools and quantifiable traits would facilitate the crop improvement process for drought tolerance in sorghum. This study evaluated phenotypic characteristics and physiological parameters determine which cultivars are more drought tolerant. Signs of drought intolerance in sorghum include leaf rolling, death of lower leaves, stunted growth and low yields. Experiments were conducted using 8 and 25 sorghum accessions planted at two sites in Kenya, namely; Biotechnology Centre and Kiboko Research site, respectively, for evaluation and seeds maintenance. Based on phenotypic characteristic of the 25 cultivars evaluated, the best drought tolerant cultivars were, IS.13615, KAK1950, KBM078, E-36.1, B-35, KBM-003 and IE SV 92036. These observations were specifically deduced from their performance, root characteristics, tillering ability and leaf parameters as drought tolerance indicators. B 35 and E-36 ranked the highest relative water content in leaves, hence more drought tolerant.Key Words: Pre-anthsis, post-anthesis, Sorghum bicolor RÉSUMÉLa sécheresse est l'une des contraintes majeures à la productivité des cultures dans le monde. L'identification des outils d'étude et des caractères quantifiables pourrait faciliter le processus d'amélioration de la culture de sorgho pour la tolérance à la sécheresse. Cette étude avait pour but l'évaluation des caractéristiques phénotypiques et des paramètres physiologiques pour déterminer les cultivars les plus tolérants à la sécheresse. Les signes de l'intolérance à la sécheresse englobent l'enroulement de la feuille, la mort des feuilles les plus basses, croissance rabougrie et réduction de rendement. Les essais étaient conduits en utilisant 8 et 25 accessions de sorgho plantées dans deux sites au Kenya, à savoir le centre de Biotechnologie et le site de recherche de kiboko, respectivement, pour l'évaluation et la maintenance des semences. Basé sur les caractéristiques phénotypiques de 25 cultivars évalués, les meilleurs cultivars en terme de tolérance à la sécheresse étaient: IS.13615, KAK1950, KBM078, E-36.1, B-35, KBM-003 et IE SV 92036. Ces observations étaient spécifiquement déduites de leur performance, caractéristiques des raciness, la capacité de tallage et les paramètres des feuilles comme indicateurs de tolérance à la sécheresse. B 35 et E-36 avaient une teneur relative plus élevée en eau et par conséquent les plus tolérants à la sécheresse.

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Tillering in Grain Sorghum over a Wide Range of Population Densities: Identification of a Common Hierarchy for Tiller Emergence, Leaf Area Development and Fertility

Cited by 97 publications

References 46 publications

Tillering and yield formation of a temperate Japonica rice cultivar in a Mediterranean rice agrosystem

Tillering and yield formation of a temperate Japonica rice cultivar in a Mediterranean rice agrosystem

Yield Responses to Planting Density for US Modern Corn Hybrids: A Synthesis‐Analysis

Phenotypic and physiological aspects related to drought tolerance in sorghum

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