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<meta content="Botwright, Tina L." name="eprints.creators_name" />
<meta content="Condon, A.G." name="eprints.creators_name" />
<meta content="Rebetzke, G.J." name="eprints.creators_name" />
<meta content="Richards, R.A." name="eprints.creators_name" />
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<meta content="Field evaluation of early vigour for genetic improvement of grain yield in wheat" name="eprints.title" />
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<meta content="Improved early vigour in wheat (Triticum aestivum L.) has been proposed as an important trait for increasing grain yield through greater water-use efficiency in rainfed, Mediterranean-type environments. Three years offield trials were undertaken in Western Australia at 2 sites, Merredin (low rainfall, 244 mm in the growing season) and Wongan Hills (medium rainfall, 308 mm), to examine the influence of increased early vigour on crop growth and yield. The effect of breeding for greater early vigour was tested in 1998 and 1999 using 3 high vigour and 3 low vigour BC2:F5 lines of the cultivar Amery backcrossed to a 'high vigour' donor. Averaged across environments, the high vigour backcross lines had a 10% increase in early vigour (i.e. leaf area/plant) at 50 DAS compared with the low vigour lines. Differences in yield across environments were associated with variation in total rainfall, rainfall distribution, and soil properties. In the wetter ofthe 2 years (1999), greater early vigour translated to increased yield of c. 12%, averaged across environments, but there was no difference in yield in either environment in the drier year (1998). Potential deleterious effects ofthe recurrent parent on yield were eliminated in field trials in 1999 and 2000 by manipulating early vigour through varying grain size (25,35, or 50 mg) or seeding density (50, 200, or 400 plants/nr') of Amery at sowing. Large grain increased the embryo size and early vigour at 50 DAS in both environments in 1999. This translated to greater biomass production at anthesis and maturity to increase grain yield at Wongan Hills in 1999. In contrast, there was no relationship between grain size, biomass production, and yield at Merredin in 1999 or at either site in 2000. Sowing density treatments also had no effect on yield in 2000. In conclusion, there is potential to increase yield of wheat by selecting for greater early vigour in a wheat breeding program. The expression of vigour in field conditions and the translation of this improvement to higher yields is, however, dependent on the environment. Current yield limitations arising through backcrossing with a high vigour, yet poor yielding donor, need to be addressed." name="eprints.abstract" />
<meta content="2002" name="eprints.date" />
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<meta content="Australian Journal of Agricultural Research" name="eprints.publication" />
<meta content="53" name="eprints.volume" />
<meta content="10" name="eprints.number" />
<meta content="1137-1145" name="eprints.pagerange" />
<meta content="10.1071/AR02007" name="eprints.id_number" />
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<meta content="0004-9409" name="eprints.issn" />
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<meta content="AssengS,TurnerNC,BotwrightTL,CondonAG(2002) Evaluatingthe impact of an early vigour trait on wheat yields using a crop simulation model. Agronomy Journal (in press).
Brownie C, Bowman DT, Burton JW (1993) Estimating spatial variation in analysis of data from yield trials: a comparison of methods. Agronomy Journal 85, 1244-1253.
Condon AG, Richards RA, Farquhar GD (1987) Carbon isotope discrimination is positively correlated with grain yield and dry matter production in field grown wheat. Crop Science 27, 996-1001.
Condon AG, Richards RA, FarquharGD (1992) The effect of variation in soil water availability, vapour pressure deficit and nitrogen nutrition on carbon isotope discrimination in wheat. Australian Journal ofAgricultural Research 43, 935-947.
Fischer RA (1979) Growth and water limitation to dryland wheat yield in Australia: a physiological framework. The Journal of the Australian Institute ofAgricultural Science 45, 83-94.
Fischer RA ( 1980) Influence of water stress on crop yield in semiarid regions. In 'Adaption of plants to water and high temperature stress'. (Eds NC Turner, PJ Kramer) (John Wiley and Sons: New York)
Fischer RA, Maurer R (1978) Drought resistance in spring wheat cultivars. I. Grain yield responses. Australian Journal of Agricultural Research 29, 897-912.
Holliday R (1960) Plant population and crop yield. Part I. Field Crops Abstracts 13, 159-167.
Kerr NJ, Siddique KHM, Delane RJ (1992) Early sowing with wheat cultivars of suitable maturity increases grain yield of spring wheat in a short season environment. Australian Journal ofExperimental Agriculture 32, 717-733.
Lopez-Castaneda C, Richards RA, Farquhar GD, Williamson RE (1996) Seed and seedling characteristics contributing to variation in early vigour among temperate cereals. Crop Science 36, 1257-1266.
Nix HA (1975) The Australian climate and its effects ofgrain yield and quality. In 'Australian field crops. Wheat and other temperate cereals. Vol. I'. (Eds A Lazenby, EM Matheson) (Angus and Robertson: Sydney)
Rebetzke GJ, Richards RA (1996) Improving the establishment and early vigour of wheat. In 'Agronomy-Science with its Sleeves Rolled Up. Proceedings of the 8th Australian Agronomy Conference'. (Ed. M Asghar) pp. 466-469 (Agronomy Society of Australia: Carlton)
Rebetzke GJ, Richards RA (1999) Genetic improvement ofearly vigour in wheat. Australian Journal ofAgricultural Research 50, 291-30l.
Rebetzke GJ, Richards RA (2000) Gibberellic acid-sensitive dwarfing genes reduce plant height to increase kernel number and grain yield ofwheat. Australian Journal ofAgricultural Research 51, 235-245.
Regan KL, Siddique KHM, Turner NC, Whan BR (1992) Potential for increasing early vigour and total biomass in spring wheat. Ir. Characteristics associated with early vigour. Australian Journal of Experimental Agriculture 43,541-553.
Richards RA, Lukacs Z (2002) Seedling vigour in wheat-sources of variation for genetic and agronomic improvement. Australian Journal ofAgricultural Research 53,41-50.
Richards RA, Rebetzke GJ, Condon AG, van Herwaarden AF (2002) Breeding opportunities for increasing the efficiency of water use and crop yield in temperate cereals. Crop Science 42, 111-121.
Richards RA, Townley-Smith TF (1987) Variation in leaf area development and its effect on water use, yield and harvest index of droughted wheat. Australian Journal ofAgricultural Research 38, 983-992.
SAS Institute Inc. (1990) 'SAS/STAT user's guide, Version 6.' 4th Edn. Vol. I. (SAS Institute: Cary, NC)
Siddique KHM, Tennant D, Perry MW, Belford RK (1990) Water use and water use efficiency of old and modern wheat cultivars in a Mediterranean type environment. Australian Journal of Agricultural Research 41,431-447.
Turner NC, Nicolas ME (1987) Drought resistance of wheat for light-textured soils in a Mediterranean climate. In 'Drought tolerance in winter cereals'. Proceedings of an International Workshop 27-31 October 1985, Capri, Italy. (Eds JP Srivastava, E Porceddu, E Acevedo, S Varma) pp. 203-216. (John Wiley and Sons: Chichester)
Turner NC, Nicolas ME (1998) Early vigour: a yield-positive characteristic for wheat in drought-prone Mediterranean-type environments. In 'Crop improvement for stress tolerance'. (Eds RK Behl, DP Singh, GP Lodhi) pp. 47-62. (CCSHAU, Hisar and MMB: New.Delhi)
Whan BR, Carlton Gp, Anderson WK (1991) Potential for increasing early vigour and total biomass in spring wheat. I. Identification of genetic improvement. Australian Journal ofAgricultural Research 42,347-361." name="eprints.referencetext" />
<meta content="Botwright, Tina L. and Condon, A.G. and Rebetzke, G.J. and Richards, R.A. (2002) Field evaluation of early vigour for genetic improvement of grain yield in wheat. Australian Journal of Agricultural Research, 53 (10). pp. 1137-1145. ISSN 0004-9409" name="eprints.citation" />
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<meta content="Improved early vigour in wheat (Triticum aestivum L.) has been proposed as an important trait for increasing grain yield through greater water-use efficiency in rainfed, Mediterranean-type environments. Three years offield trials were undertaken in Western Australia at 2 sites, Merredin (low rainfall, 244 mm in the growing season) and Wongan Hills (medium rainfall, 308 mm), to examine the influence of increased early vigour on crop growth and yield. The effect of breeding for greater early vigour was tested in 1998 and 1999 using 3 high vigour and 3 low vigour BC2:F5 lines of the cultivar Amery backcrossed to a 'high vigour' donor. Averaged across environments, the high vigour backcross lines had a 10% increase in early vigour (i.e. leaf area/plant) at 50 DAS compared with the low vigour lines. Differences in yield across environments were associated with variation in total rainfall, rainfall distribution, and soil properties. In the wetter ofthe 2 years (1999), greater early vigour translated to increased yield of c. 12%, averaged across environments, but there was no difference in yield in either environment in the drier year (1998). Potential deleterious effects ofthe recurrent parent on yield were eliminated in field trials in 1999 and 2000 by manipulating early vigour through varying grain size (25,35, or 50 mg) or seeding density (50, 200, or 400 plants/nr') of Amery at sowing. Large grain increased the embryo size and early vigour at 50 DAS in both environments in 1999. This translated to greater biomass production at anthesis and maturity to increase grain yield at Wongan Hills in 1999. In contrast, there was no relationship between grain size, biomass production, and yield at Merredin in 1999 or at either site in 2000. Sowing density treatments also had no effect on yield in 2000. In conclusion, there is potential to increase yield of wheat by selecting for greater early vigour in a wheat breeding program. The expression of vigour in field conditions and the translation of this improvement to higher yields is, however, dependent on the environment. Current yield limitations arising through backcrossing with a high vigour, yet poor yielding donor, need to be addressed." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Field evaluation of early vigour for genetic improvement of grain yield in wheat</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Botwright, Tina L.</span> and <span class="person_name">Condon, A.G.</span> and <span class="person_name">Rebetzke, G.J.</span> and <span class="person_name">Richards, R.A.</span> (2002) <xhtml:em>Field evaluation of early vigour for genetic improvement of grain yield in wheat.</xhtml:em> Australian Journal of Agricultural Research, 53 (10). pp. 1137-1145. ISSN 0004-9409</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2488/1/Botwright_et_al_2002_AJAR.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2488/1/Botwright_et_al_2002_AJAR.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />189Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3268" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/AR02007">http://dx.doi.org/10.1071/AR02007</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Improved early vigour in wheat (Triticum aestivum L.) has been proposed as an important trait for increasing grain yield through greater water-use efficiency in rainfed, Mediterranean-type environments. Three years offield trials were undertaken in Western Australia at 2 sites, Merredin (low rainfall, 244 mm in the growing season) and Wongan Hills (medium rainfall, 308 mm), to examine the influence of increased early vigour on crop growth and yield. The effect of breeding for greater early vigour was tested in 1998 and 1999 using 3 high vigour and 3 low vigour BC2:F5 lines of the cultivar Amery backcrossed to a 'high vigour' donor. Averaged across environments, the high vigour backcross lines had a 10% increase in early vigour (i.e. leaf area/plant) at 50 DAS compared with the low vigour lines. Differences in yield across environments were associated with variation in total rainfall, rainfall distribution, and soil properties. In the wetter ofthe 2 years (1999), greater early vigour translated to increased yield of c. 12%, averaged across environments, but there was no difference in yield in either environment in the drier year (1998). Potential deleterious effects ofthe recurrent parent on yield were eliminated in field trials in 1999 and 2000 by manipulating early vigour through varying grain size (25,35, or 50 mg) or seeding density (50, 200, or 400 plants/nr') of Amery at sowing. Large grain increased the embryo size and early vigour at 50 DAS in both environments in 1999. This translated to greater biomass production at anthesis and maturity to increase grain yield at Wongan Hills in 1999. In contrast, there was no relationship between grain size, biomass production, and yield at Merredin in 1999 or at either site in 2000. Sowing density treatments also had no effect on yield in 2000. In conclusion, there is potential to increase yield of wheat by selecting for greater early vigour in a wheat breeding program. The expression of vigour in field conditions and the translation of this improvement to higher yields is, however, dependent on the environment. Current yield limitations arising through backcrossing with a high vigour, yet poor yielding donor, need to be addressed.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/300000.html">300000 Agricultural, Veterinary and Environmental Sciences</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300203.html">300000 Agricultural, Veterinary and Environmental Sciences > 300200 Crop and Pasture Production > 300203 Plant Improvement (Selection, Breeding and Genetic Engineering)</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300900.html">300000 Agricultural, Veterinary and Environmental Sciences > 300900 Land, Parks and Agriculture Management</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2488</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Tina LB Acuna</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">21 Nov 2007 09:46</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2488;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2488">item control page</a></p>
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