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Reduced height (Rht) and photoperiod insensitivity (Ppd) allele associations with establishment and early growth of wheat in contrasting production systems

Near isogenic lines (NILs) varying for genes for reduced height ( Rht ) and photoperiod insensitivity ( Ppd-D1a ) in a cv. Mercia background ( rht (tall), Rht-B1b , Rht-D1b , Rht-B1c , Rht8c + Ppd-D1a , Rht-D1c , Rht12 ) were compared at one field site but within contrasting (‘organic’ vs. ‘conventi...

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Published in:Euphytica 2009-03, Vol.166 (2), p.249-267, Article 249
Main Authors: Addisu, M., Snape, J. W., Simmonds, J. R., Gooding, M. J.
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description Near isogenic lines (NILs) varying for genes for reduced height ( Rht ) and photoperiod insensitivity ( Ppd-D1a ) in a cv. Mercia background ( rht (tall), Rht-B1b , Rht-D1b , Rht-B1c , Rht8c + Ppd-D1a , Rht-D1c , Rht12 ) were compared at one field site but within contrasting (‘organic’ vs. ‘conventional’) rotational and agronomic contexts, in each of 3 years. In the final year, further NILs ( rht (tall), Rht-B1b , Rht-D1b , Rht-B1c , Rht-B1b  +  Rht-D1b , Rht-D1b + Rht-B1c ) in both Maris Huntsman and Maris Widgeon backgrounds were added together with 64 lines of a doubled haploid (DH) population [Savannah ( Rht-D1b ) × Renesansa ( Rht-8c  +  Ppd-D1a )]. Assessments included laboratory tests of germination and coleoptile length, and various field measurements of crop growth between emergence and pre jointing [plant population, tillering, leaf length, ground cover (GC), interception of photosynthetically active radiation (PAR), crop dry matter (DM) and nitrogen accumulation (N), far red: red reflectance ratio (FR:R), crop height, and weed dry matter]. All of the dwarfing alleles except Rht12 in the Mercia background and Rht8c in the DHs were associated with reduced coleoptile length. Most of the dwarfing alleles (depending on background) reduced seed viability. Severe dwarfing alleles ( Rht-B1c , Rht-D1c and Rht12 ) were routinely associated with fewer plant numbers and reduced early crop growth (GC, PAR, DM, N, FR:R), and in 1 year, increased weed DM. In the Mercia background and the DHs the semi-dwarfing allele Rht-D1b was also sometimes associated with reductions in early crop growth; no such negative effects were associated with the marker for Rht8c . When significant interactions between cropping system and genotype did occur it was because differences between lines were more exaggerated in the organic system than in the conventional system. Ppd-D1a was associated positively with plant numbers surviving the winter and early crop growth (GC, FR:R, DM, N, PAR, height), and was the most significant locus in a QTL analysis. We conclude that, within these environmental and system contexts, genes moderating development are likely to be more important in influencing early resource capture than using Rht8c as an alternative semi-dwarfing gene to Rht-D1b .
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Assessments included laboratory tests of germination and coleoptile length, and various field measurements of crop growth between emergence and pre jointing [plant population, tillering, leaf length, ground cover (GC), interception of photosynthetically active radiation (PAR), crop dry matter (DM) and nitrogen accumulation (N), far red: red reflectance ratio (FR:R), crop height, and weed dry matter]. All of the dwarfing alleles except Rht12 in the Mercia background and Rht8c in the DHs were associated with reduced coleoptile length. Most of the dwarfing alleles (depending on background) reduced seed viability. Severe dwarfing alleles ( Rht-B1c , Rht-D1c and Rht12 ) were routinely associated with fewer plant numbers and reduced early crop growth (GC, PAR, DM, N, FR:R), and in 1 year, increased weed DM. 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In the final year, further NILs ( rht (tall), Rht-B1b , Rht-D1b , Rht-B1c , Rht-B1b  +  Rht-D1b , Rht-D1b + Rht-B1c ) in both Maris Huntsman and Maris Widgeon backgrounds were added together with 64 lines of a doubled haploid (DH) population [Savannah ( Rht-D1b ) × Renesansa ( Rht-8c  +  Ppd-D1a )]. Assessments included laboratory tests of germination and coleoptile length, and various field measurements of crop growth between emergence and pre jointing [plant population, tillering, leaf length, ground cover (GC), interception of photosynthetically active radiation (PAR), crop dry matter (DM) and nitrogen accumulation (N), far red: red reflectance ratio (FR:R), crop height, and weed dry matter]. All of the dwarfing alleles except Rht12 in the Mercia background and Rht8c in the DHs were associated with reduced coleoptile length. Most of the dwarfing alleles (depending on background) reduced seed viability. Severe dwarfing alleles ( Rht-B1c , Rht-D1c and Rht12 ) were routinely associated with fewer plant numbers and reduced early crop growth (GC, PAR, DM, N, FR:R), and in 1 year, increased weed DM. In the Mercia background and the DHs the semi-dwarfing allele Rht-D1b was also sometimes associated with reductions in early crop growth; no such negative effects were associated with the marker for Rht8c . When significant interactions between cropping system and genotype did occur it was because differences between lines were more exaggerated in the organic system than in the conventional system. Ppd-D1a was associated positively with plant numbers surviving the winter and early crop growth (GC, FR:R, DM, N, PAR, height), and was the most significant locus in a QTL analysis. 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Severe dwarfing alleles ( Rht-B1c , Rht-D1c and Rht12 ) were routinely associated with fewer plant numbers and reduced early crop growth (GC, PAR, DM, N, FR:R), and in 1 year, increased weed DM. In the Mercia background and the DHs the semi-dwarfing allele Rht-D1b was also sometimes associated with reductions in early crop growth; no such negative effects were associated with the marker for Rht8c . When significant interactions between cropping system and genotype did occur it was because differences between lines were more exaggerated in the organic system than in the conventional system. Ppd-D1a was associated positively with plant numbers surviving the winter and early crop growth (GC, FR:R, DM, N, PAR, height), and was the most significant locus in a QTL analysis. We conclude that, within these environmental and system contexts, genes moderating development are likely to be more important in influencing early resource capture than using Rht8c as an alternative semi-dwarfing gene to Rht-D1b .</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s10681-008-9838-7</doi><tpages>19</tpages></addata></record>
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language eng
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source Springer Nature
subjects Agronomy
Agronomy. Soil science and plant productions
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Cropping systems
Crops
Dry matter
Fundamental and applied biological sciences. Psychology
Genetics
Genetics and breeding of economic plants
Ground cover
Interception
Laboratory tests
Life Sciences
Plant Genetics and Genomics
Plant growth
Plant Pathology
Plant Physiology
Plant populations
Plant reproduction
Plant Sciences
Wheat
title Reduced height (Rht) and photoperiod insensitivity (Ppd) allele associations with establishment and early growth of wheat in contrasting production systems
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