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<meta content="Botwright, Tina L." name="eprints.creators_name" />
<meta content="Rebetzke, G.J." name="eprints.creators_name" />
<meta content="Condon, A.G." name="eprints.creators_name" />
<meta content="Richards, R.A." name="eprints.creators_name" />
<meta content="Tina.Acuna@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-11-20 22:56:20" name="eprints.datestamp" />
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<meta content="The effect of rht genotype and temperature on coleoptile growth and dry matter partitioning in young wheat seedlings" name="eprints.title" />
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Coleoptile length in wheat (Triticum aestivum L.) can be affected by several factors, including genotype, height-reducing genes and environmental factors, including temperature. There is little information on how these factors influence rate and duration of coleoptile growth to determine final coleoptile length in wheat. Coleoptile growth was determined for eight genotypes representing four different height-reducing genes: gibberellic acid (GA)-sensitive, standard height (rht), GA-sensitive semidwarfs (Rht8); and GA-insensitive, semidwarfs (Rht2). These were grown in the dark at three temperatures (12, 16 and 20˚C) and coleoptile lengths measured every 12˚Cd. Logistic growth curves were fitted to coleoptile growth data for each genotype with thermal time as the explanatory variable. Differences in final coleoptile length were largely attributable to differences in rate of coleoptile elongation although there were small differences in duration of growth between genotypes. The longer coleoptile of the rht wheats was achieved through the fastest rate of coleoptile elongation. Coleoptiles of Rht8 wheats were equivalent in final length to rht wheats at 107 mm, but achieved this through a slower growth rate (2.10 mm ˚Cd–1) combined with an increased duration of growth (57˚Cd). In contrast, the shorter coleoptiles of Rht2 wheats resulted from 25% slower rates of elongation than either Rht8 or rht. There were no interactions between the components of coleoptile growth and temperature, although a longer duration and a fast rate of growth combined to increase coleoptile length at 12˚C compared with either 16 or 20˚C. In a second experiment, dry matter partitioning and length of coleoptile, subcrown internode (SCI), shoot and roots were determined after 200˚Cd. In Rht2, the SCI and shoot were short while roots were longer than either Rht8 or rht. Reduced dry matter (DM) partitioning to the coleoptile and SCI and DM retention in the seed reduced the endosperm-use efficiency (EUE) of Rht compared with rht. EUE was poor also in Rht8, apparently through increased respiratory losses. Reduced partitioning of dry matter to coleoptiles and the SCI in Rht2 increased the root : shoot ratio compared with rht or Rht8. We conclude that either increased rate or duration of coleoptile growth could be targeted in a breeding program that aims to increase coleoptile length in wheat.
" name="eprints.abstract" />
<meta content="2001" name="eprints.date" />
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<meta content="Australian Journal of Plant Physiology" name="eprints.publication" />
<meta content="28" name="eprints.volume" />
<meta content="5" name="eprints.number" />
<meta content="417-423" name="eprints.pagerange" />
<meta content="10.1071/PP01010" name="eprints.id_number" />
<meta content="TRUE" name="eprints.refereed" />
<meta content="1445-4408" name="eprints.issn" />
<meta content="http://dx.doi.org/10.1071/PP01010" name="eprints.official_url" />
<meta content="Addae PC, Pearson CJ (1992) Thermal requirements for germination
and seedling growth of wheat. Australian Journal of Agricultural
Research 43, 585–594.
Allan RE (1989) Agronomic comparisons between Rht-B1b and
Rht-D1b semidwarf genes in winter wheat. Crop Science 29,
1103–1108.
Allan RE, Vogel OA, Burleigh JR, Peterson CJ (1961) Inheritance of
coleoptile length and its association with culm length in four winter
wheat crosses. Crop Science 1, 328–332.
Bhatt GM, Qualset CO (1976) Genotype-environment interactions in
wheat: effects of temperature on coleoptile length. Experimental
Agriculture 12, 17–22.
Bleiss W (1994) Time course of phytochrome-mediated changes in
growth gradients on coleoptiles of Triticum aestivum L. Planta 192,
340–346.
Blum A, Sinmena B (1994) Wheat seed endosperm utilization under
heat stress and its relation to thermotolerance in the autotrophic
plant. Field Crops Research 37, 185–191.
Botwright TL, Rebetzke GJ, Condon AG, Richards RA (2001)
Influence of variety, seed position and seed source on screening for
coleoptile length in bread wheat (Triticum aestivum L.). Euphytica
(in press)
Burleigh JR, Allan RE, Vogel OA (1965) Varietal differences in
seedling emergence of winter wheats as influenced by temperature
and depth of planting. Agronomy Journal 57, 195–198.Bush MG, Evans LT (1988) Growth and development in tall and dwarf
isogenic lines of spring wheat. Field Crops Research 18, 243–270.
Chowdhry AR, Allan RE (1966) Culm length and differential
development in the coleoptile, root and subcrown internode of
near-isogenic wheat lines. Crop Science 6, 49–51.
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length of wheat. Australian Journal of Experimental Agriculture 28,
521–523.
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shoot vs root growth and low temperatures and its relationship with
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Rht2 on cellular dimensions and rate of leaf elongation in wheat.
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wall extensibility in wheat (Triticum aestivum). Plant Physiology
92, 242–245.
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partitioning in near-isogenic wheat lines differing in plant height.
Canadian Journal of Plant Science 73, 679–689.
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near-isogenic lines of spring wheat for dwarfism. Plant and Soil
197, 79–86.
Radford BJ (1987) Effect of constant and fluctuating temperature
regimes and seed source on the coleoptile length of tall and
semidwarf wheats. Australian Journal of Experimental Agriculture
27, 113–117.
Rebetzke GJ, Richards RA (2000) Gibberellic acid-sensitive dwarfing
genes reduce plant height to increase kernel number and grain yield
of wheat. Australian Journal of Agricultural Research 51, 235–245.
Rebetzke GJ, Richards RA, Fischer VM, Mickelson BJ (1999)
Breeding long coleoptile, reduced height wheats. Euphytica 106,
159–168.
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pattern and of gibberellin sensitivity in relation to age, growth rate,
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427–440.
Tonkinson CL, Lyndon RF, Arnold GM, Lenton JR (1995). Effect of
the Rht3 dwarfing gene on dynamics of cell extension in wheat
levels, and its modification by gibberellic acid and paclobutrazol.
Journal of Experimental Botany 46, 1085–1092.
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development and growth of winter wheat roots. I. Controlled
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coleoptile (Triticum vulgare L.). 1. Estimation of cell number, cell
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Experimental Botany 12, 303–318." name="eprints.referencetext" />
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<meta content="Condon, A.G." name="DC.creator" />
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Coleoptile length in wheat (Triticum aestivum L.) can be affected by several factors, including genotype, height-reducing genes and environmental factors, including temperature. There is little information on how these factors influence rate and duration of coleoptile growth to determine final coleoptile length in wheat. Coleoptile growth was determined for eight genotypes representing four different height-reducing genes: gibberellic acid (GA)-sensitive, standard height (rht), GA-sensitive semidwarfs (Rht8); and GA-insensitive, semidwarfs (Rht2). These were grown in the dark at three temperatures (12, 16 and 20˚C) and coleoptile lengths measured every 12˚Cd. Logistic growth curves were fitted to coleoptile growth data for each genotype with thermal time as the explanatory variable. Differences in final coleoptile length were largely attributable to differences in rate of coleoptile elongation although there were small differences in duration of growth between genotypes. The longer coleoptile of the rht wheats was achieved through the fastest rate of coleoptile elongation. Coleoptiles of Rht8 wheats were equivalent in final length to rht wheats at 107 mm, but achieved this through a slower growth rate (2.10 mm ˚Cd–1) combined with an increased duration of growth (57˚Cd). In contrast, the shorter coleoptiles of Rht2 wheats resulted from 25% slower rates of elongation than either Rht8 or rht. There were no interactions between the components of coleoptile growth and temperature, although a longer duration and a fast rate of growth combined to increase coleoptile length at 12˚C compared with either 16 or 20˚C. In a second experiment, dry matter partitioning and length of coleoptile, subcrown internode (SCI), shoot and roots were determined after 200˚Cd. In Rht2, the SCI and shoot were short while roots were longer than either Rht8 or rht. Reduced dry matter (DM) partitioning to the coleoptile and SCI and DM retention in the seed reduced the endosperm-use efficiency (EUE) of Rht compared with rht. EUE was poor also in Rht8, apparently through increased respiratory losses. Reduced partitioning of dry matter to coleoptiles and the SCI in Rht2 increased the root : shoot ratio compared with rht or Rht8. We conclude that either increased rate or duration of coleoptile growth could be targeted in a breeding program that aims to increase coleoptile length in wheat.
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<h1 class="ep_tm_pagetitle">The effect of rht genotype and temperature on coleoptile growth and dry matter partitioning in young wheat seedlings</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Botwright, Tina L.</span> and <span class="person_name">Rebetzke, G.J.</span> and <span class="person_name">Condon, A.G.</span> and <span class="person_name">Richards, R.A.</span> (2001) <xhtml:em>The effect of rht genotype and temperature on coleoptile growth and dry matter partitioning in young wheat seedlings.</xhtml:em> Australian Journal of Plant Physiology, 28 (5). pp. 417-423. ISSN 1445-4408</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/2489/1/Botwright_AJPP.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/2489/1/Botwright_AJPP.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />193Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3270" 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/PP01010">http://dx.doi.org/10.1071/PP01010</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">
Coleoptile length in wheat (Triticum aestivum L.) can be affected by several factors, including genotype, height-reducing genes and environmental factors, including temperature. There is little information on how these factors influence rate and duration of coleoptile growth to determine final coleoptile length in wheat. Coleoptile growth was determined for eight genotypes representing four different height-reducing genes: gibberellic acid (GA)-sensitive, standard height (rht), GA-sensitive semidwarfs (Rht8); and GA-insensitive, semidwarfs (Rht2). These were grown in the dark at three temperatures (12, 16 and 20˚C) and coleoptile lengths measured every 12˚Cd. Logistic growth curves were fitted to coleoptile growth data for each genotype with thermal time as the explanatory variable. Differences in final coleoptile length were largely attributable to differences in rate of coleoptile elongation although there were small differences in duration of growth between genotypes. The longer coleoptile of the rht wheats was achieved through the fastest rate of coleoptile elongation. Coleoptiles of Rht8 wheats were equivalent in final length to rht wheats at 107 mm, but achieved this through a slower growth rate (2.10 mm ˚Cd–1) combined with an increased duration of growth (57˚Cd). In contrast, the shorter coleoptiles of Rht2 wheats resulted from 25% slower rates of elongation than either Rht8 or rht. There were no interactions between the components of coleoptile growth and temperature, although a longer duration and a fast rate of growth combined to increase coleoptile length at 12˚C compared with either 16 or 20˚C. In a second experiment, dry matter partitioning and length of coleoptile, subcrown internode (SCI), shoot and roots were determined after 200˚Cd. In Rht2, the SCI and shoot were short while roots were longer than either Rht8 or rht. Reduced dry matter (DM) partitioning to the coleoptile and SCI and DM retention in the seed reduced the endosperm-use efficiency (EUE) of Rht compared with rht. EUE was poor also in Rht8, apparently through increased respiratory losses. Reduced partitioning of dry matter to coleoptiles and the SCI in Rht2 increased the root : shoot ratio compared with rht or Rht8. We conclude that either increased rate or duration of coleoptile growth could be targeted in a breeding program that aims to increase coleoptile length in wheat.
</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">Additional Information:</th><td valign="top" class="ep_row">Journal name change to :Functional Plant Biology</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/300203.html">300000 Agricultural, Veterinary and Environmental Sciences > 300200 Crop and Pasture Production > 300203 Plant Improvement (Selection, Breeding and Genetic Engineering)</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2489</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 09:56</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=2489;">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=2489">item control page</a></p>
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