A wheat genotype developed for rapid leaf growth copes well with the physical and biological constraints of unploughed soil

Functional Plant Biology : FPB
Michelle WattGregory J Rebetzke

Abstract

Conventional wheat (Triticum aestivum L.) cultivars grow slowly in unploughed soil because of physical and biological constraints. Here a conventional cultivar (Janz) is compared with a novel experimental line (Vigour 18), bred for high leaf vigour, to explore the hypothesis that a vigorous wheat grows better in unploughed soil. Roots of both genotypes in unploughed soil were three times more distorted with 30% shorter apices and 60% shorter expansion zones than roots in ploughed soil, because of voids between blocky peds and packed sand particles that impeded root apices. More than half the root length contacted dead, remnant roots. Vigour 18 roots grew 39% faster, were thicker and distorted less than Janz roots in unploughed soil, but developed similarly in ploughed soil. Vigour 18 shoots grew 64% faster in unploughed soil, but 15% faster in ploughed soil. Fumigation of unploughed soil improved the growth of Janz only. We suggest that faster root growth, different exudates promoting a more beneficial rhizosphere microflora, or modified shoot responses are possible mechanisms to explain Vigour 18's superior growth. Vigorous genotypes may present a new opportunity for increased productivity with conservation farming.

References

Feb 14, 2002·Plant, Cell & Environment·J. B. Passioura
Mar 1, 2004·Functional Plant Biology : FPB·Mingtan LiaoJairo A Palta
Nov 1, 2003·The New Phytologist·Rich Zobel
Sep 1, 2004·The New Phytologist·David L JonesYakov Kuzyakov

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Citations

Jan 29, 2008·The New Phytologist·Michelle WattMargaret E McCully
Nov 10, 2009·Plant, Cell & Environment·Rosemary G White, John A Kirkegaard
Feb 26, 2020·Annual Review of Plant Biology·Michelle WattUlrich Schurr
Mar 1, 2013·Functional Plant Biology : FPB·Maryse BourgaultScott C Chapman
May 1, 2006·Functional Plant Biology : FPB·Linda C EnnsMartin J Canny
Nov 1, 2009·Functional Plant Biology : FPB·Michelle WattIain W Wilson
Aug 19, 2007·The New Phytologist·Susan J SpragueBarbara J Howlett
Mar 19, 2014·Environmental Microbiology·Suzanne DonnMichelle Watt
Aug 17, 2010·Journal of Experimental Botany·J A Kirkegaard, J R Hunt
Apr 3, 2012·Journal of Experimental Botany·Vincent ChochoisMichelle Watt
Mar 19, 2013·Journal of Experimental Botany·Sarah M Rich, Michelle Watt
Nov 1, 2012·Functional Plant Biology : FPB·J B Passioura
Jan 25, 2012·Journal of Experimental Botany·Richard J FlavelIain M Young
Jan 15, 2015·Journal of Experimental Botany·Jonathan P Lynch, Tobias Wojciechowski
Dec 2, 2010·Journal of Experimental Botany·Afrasyab RahnamaMichelle Watt
Jun 1, 2012·Functional Plant Biology : FPB·Abdelhalim ElazabJos Luis Araus
Dec 25, 2012·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Julien BonneauDiane Mather
Dec 15, 2020·Physiologia Plantarum·Jitendra KumarKadambot H M Siddique

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Methods Mentioned

BETA
dissecting

Software Mentioned

Zeiss AxioVision
AxioVision
Genstat
Adobe Photoshop
Photoshop
WINRhizo

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