Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio

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97 Citations (Scopus)

Abstract

¿ Background and Aims The production of axillary shoots (tillering) in spring wheat (Triticum aestivum) depends on intraspecific competition. The mechanisms that underlie this competition are complex, but light within the wheat canopy plays a key role. The main objectives of this paper are to analyse the effects of plant population density and shade on tillering dynamics of spring wheat, to assess the canopy conditions quantitatively at the time of tillering cessation, and to analyse the relationship between the tiller bud and the leaf on the same phytomer. Methods Spring wheat plants were grown at three plant population densities and under two light regimes (25 % and 100 % light). Tiller appearance, fraction of the light intercepted, and red : far-red ratio at soil level were recorded. On six sampling dates the growth status of axillary buds was analysed. Key Results Tillering ceased earlier at high population densities and ceased earlier in the shade than in full sunlight. At cessation of tillering, both the fraction of light intercepted and the red : far-red ratio at soil level were similar in all treatments. Leaves on the same phytomer of buds that grew out showed more leaf mass per unit area than those on the same phytomer of buds that remained dormant. Conclusions Tillering ceases at specific light conditions within the wheat canopy, independent of population density, and to a lesser extent independent of light intensity. It is suggested that cessation of tillering is induced when the fraction of PAR intercepted by the canopy exceeds a specific threshold (0·40-0·45) and red : far-red ratio drops below 0·35-0·40
Original languageEnglish
Pages (from-to)649-658
JournalAnnals of Botany
Volume97
Issue number4
DOIs
Publication statusPublished - 2006

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tillering
spring wheat
population density
buds
canopy
shade
leaves
wheat
intraspecific competition
light intensity
soil
solar radiation
Triticum aestivum
photoperiod
shoots

Keywords

  • morphological responses
  • triticum-aestivum
  • neighbor plants
  • winter-wheat
  • wide-range
  • leaf
  • growth
  • barley
  • phytochrome
  • perception

Cite this

@article{31ef7b42272d4e9c980766784bd53aa4,
title = "Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio",
abstract = "¿ Background and Aims The production of axillary shoots (tillering) in spring wheat (Triticum aestivum) depends on intraspecific competition. The mechanisms that underlie this competition are complex, but light within the wheat canopy plays a key role. The main objectives of this paper are to analyse the effects of plant population density and shade on tillering dynamics of spring wheat, to assess the canopy conditions quantitatively at the time of tillering cessation, and to analyse the relationship between the tiller bud and the leaf on the same phytomer. Methods Spring wheat plants were grown at three plant population densities and under two light regimes (25 {\%} and 100 {\%} light). Tiller appearance, fraction of the light intercepted, and red : far-red ratio at soil level were recorded. On six sampling dates the growth status of axillary buds was analysed. Key Results Tillering ceased earlier at high population densities and ceased earlier in the shade than in full sunlight. At cessation of tillering, both the fraction of light intercepted and the red : far-red ratio at soil level were similar in all treatments. Leaves on the same phytomer of buds that grew out showed more leaf mass per unit area than those on the same phytomer of buds that remained dormant. Conclusions Tillering ceases at specific light conditions within the wheat canopy, independent of population density, and to a lesser extent independent of light intensity. It is suggested that cessation of tillering is induced when the fraction of PAR intercepted by the canopy exceeds a specific threshold (0·40-0·45) and red : far-red ratio drops below 0·35-0·40",
keywords = "morphological responses, triticum-aestivum, neighbor plants, winter-wheat, wide-range, leaf, growth, barley, phytochrome, perception",
author = "J.B. Evers and J. Vos and B. Andrieu and P.C. Struik",
year = "2006",
doi = "10.1093/aob/mcl020",
language = "English",
volume = "97",
pages = "649--658",
journal = "Annals of Botany",
issn = "0305-7364",
publisher = "Oxford University Press",
number = "4",

}

Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio. / Evers, J.B.; Vos, J.; Andrieu, B.; Struik, P.C.

In: Annals of Botany, Vol. 97, No. 4, 2006, p. 649-658.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio

AU - Evers, J.B.

AU - Vos, J.

AU - Andrieu, B.

AU - Struik, P.C.

PY - 2006

Y1 - 2006

N2 - ¿ Background and Aims The production of axillary shoots (tillering) in spring wheat (Triticum aestivum) depends on intraspecific competition. The mechanisms that underlie this competition are complex, but light within the wheat canopy plays a key role. The main objectives of this paper are to analyse the effects of plant population density and shade on tillering dynamics of spring wheat, to assess the canopy conditions quantitatively at the time of tillering cessation, and to analyse the relationship between the tiller bud and the leaf on the same phytomer. Methods Spring wheat plants were grown at three plant population densities and under two light regimes (25 % and 100 % light). Tiller appearance, fraction of the light intercepted, and red : far-red ratio at soil level were recorded. On six sampling dates the growth status of axillary buds was analysed. Key Results Tillering ceased earlier at high population densities and ceased earlier in the shade than in full sunlight. At cessation of tillering, both the fraction of light intercepted and the red : far-red ratio at soil level were similar in all treatments. Leaves on the same phytomer of buds that grew out showed more leaf mass per unit area than those on the same phytomer of buds that remained dormant. Conclusions Tillering ceases at specific light conditions within the wheat canopy, independent of population density, and to a lesser extent independent of light intensity. It is suggested that cessation of tillering is induced when the fraction of PAR intercepted by the canopy exceeds a specific threshold (0·40-0·45) and red : far-red ratio drops below 0·35-0·40

AB - ¿ Background and Aims The production of axillary shoots (tillering) in spring wheat (Triticum aestivum) depends on intraspecific competition. The mechanisms that underlie this competition are complex, but light within the wheat canopy plays a key role. The main objectives of this paper are to analyse the effects of plant population density and shade on tillering dynamics of spring wheat, to assess the canopy conditions quantitatively at the time of tillering cessation, and to analyse the relationship between the tiller bud and the leaf on the same phytomer. Methods Spring wheat plants were grown at three plant population densities and under two light regimes (25 % and 100 % light). Tiller appearance, fraction of the light intercepted, and red : far-red ratio at soil level were recorded. On six sampling dates the growth status of axillary buds was analysed. Key Results Tillering ceased earlier at high population densities and ceased earlier in the shade than in full sunlight. At cessation of tillering, both the fraction of light intercepted and the red : far-red ratio at soil level were similar in all treatments. Leaves on the same phytomer of buds that grew out showed more leaf mass per unit area than those on the same phytomer of buds that remained dormant. Conclusions Tillering ceases at specific light conditions within the wheat canopy, independent of population density, and to a lesser extent independent of light intensity. It is suggested that cessation of tillering is induced when the fraction of PAR intercepted by the canopy exceeds a specific threshold (0·40-0·45) and red : far-red ratio drops below 0·35-0·40

KW - morphological responses

KW - triticum-aestivum

KW - neighbor plants

KW - winter-wheat

KW - wide-range

KW - leaf

KW - growth

KW - barley

KW - phytochrome

KW - perception

U2 - 10.1093/aob/mcl020

DO - 10.1093/aob/mcl020

M3 - Article

VL - 97

SP - 649

EP - 658

JO - Annals of Botany

JF - Annals of Botany

SN - 0305-7364

IS - 4

ER -