Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield

This study investigated changes in stem and spike characteristics resulting from breeding in Iranian wheat cultivars, and their relationship with grain yield. Eighty-one wheat cultivars released between 1930 and 2006 were examined under well-watered (WW) and terminal drought stress (DS) conditions i...

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Main Authors: Mehdi JOUDI, Ali AHMADI, Valiollah MOHAMMADI
Format: Article
Language:English
Published: Czech Academy of Agricultural Sciences 2017-09-01
Series:Czech Journal of Genetics and Plant Breeding
Subjects:
Online Access:https://cjgpb.agriculturejournals.cz/artkey/cjg-201703-0003_changes-in-stem-and-spike-related-traits-resulting-from-breeding-in-iranian-wheat-cultivars-associations-with.php
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author Mehdi JOUDI
Ali AHMADI
Valiollah MOHAMMADI
author_facet Mehdi JOUDI
Ali AHMADI
Valiollah MOHAMMADI
author_sort Mehdi JOUDI
collection DOAJ
description This study investigated changes in stem and spike characteristics resulting from breeding in Iranian wheat cultivars, and their relationship with grain yield. Eighty-one wheat cultivars released between 1930 and 2006 were examined under well-watered (WW) and terminal drought stress (DS) conditions in Karaj during 2007-2008 and 2008-2009 and under WW condition at Parsabad in Moghan region during 2010-2011. A genetic improvement over time in stem specific weight (SSW) along with significant positive correlations between this trait and grain yield were found at Karaj under DS conditions and at Parsabad, suggesting that SSW could be used as an indirect selection criterion for yield in these environments. Time-dependent changes in spike dry weight showed that the magnitude of partitioned photoassimilates to the spike during the phase anthesis - 16 days after anthesis (16 DAA) was not changed by breeding. However, during the 16 DAA ‒ maturity phase, modern cultivars had more photoassimilates allocated to the spike than the old ones. This suggests that the sink is more limited during early grain growth than during the end of grain filling.
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spelling doaj.art-33f66f443be1491cab0d4b267033a5d72023-02-23T03:30:38ZengCzech Academy of Agricultural SciencesCzech Journal of Genetics and Plant Breeding1212-19751805-93252017-09-0153310711310.17221/178/2016-CJGPBcjg-201703-0003Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yieldMehdi JOUDI0Ali AHMADI1Valiollah MOHAMMADI2Meshkinshahr Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, IranDepartment of Agronomy and Plant Breeding, University College of Agriculture and Natural Resources, University of Tehran, Karaj, IranDepartment of Agronomy and Plant Breeding, University College of Agriculture and Natural Resources, University of Tehran, Karaj, IranThis study investigated changes in stem and spike characteristics resulting from breeding in Iranian wheat cultivars, and their relationship with grain yield. Eighty-one wheat cultivars released between 1930 and 2006 were examined under well-watered (WW) and terminal drought stress (DS) conditions in Karaj during 2007-2008 and 2008-2009 and under WW condition at Parsabad in Moghan region during 2010-2011. A genetic improvement over time in stem specific weight (SSW) along with significant positive correlations between this trait and grain yield were found at Karaj under DS conditions and at Parsabad, suggesting that SSW could be used as an indirect selection criterion for yield in these environments. Time-dependent changes in spike dry weight showed that the magnitude of partitioned photoassimilates to the spike during the phase anthesis - 16 days after anthesis (16 DAA) was not changed by breeding. However, during the 16 DAA ‒ maturity phase, modern cultivars had more photoassimilates allocated to the spike than the old ones. This suggests that the sink is more limited during early grain growth than during the end of grain filling.https://cjgpb.agriculturejournals.cz/artkey/cjg-201703-0003_changes-in-stem-and-spike-related-traits-resulting-from-breeding-in-iranian-wheat-cultivars-associations-with.phppartitioned photoassimilatessink limitationstem specific weighttriticum aestivumtriticum durum
spellingShingle Mehdi JOUDI
Ali AHMADI
Valiollah MOHAMMADI
Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
Czech Journal of Genetics and Plant Breeding
partitioned photoassimilates
sink limitation
stem specific weight
triticum aestivum
triticum durum
title Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
title_full Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
title_fullStr Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
title_full_unstemmed Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
title_short Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield
title_sort changes in stem and spike related traits resulting from breeding in iranian wheat cultivars associations with grain yield
topic partitioned photoassimilates
sink limitation
stem specific weight
triticum aestivum
triticum durum
url https://cjgpb.agriculturejournals.cz/artkey/cjg-201703-0003_changes-in-stem-and-spike-related-traits-resulting-from-breeding-in-iranian-wheat-cultivars-associations-with.php
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AT aliahmadi changesinstemandspikerelatedtraitsresultingfrombreedinginiranianwheatcultivarsassociationswithgrainyield
AT valiollahmohammadi changesinstemandspikerelatedtraitsresultingfrombreedinginiranianwheatcultivarsassociationswithgrainyield