Abstract
Plant height is an important agronomic trait for morphogenesis and grain yield formation in wheat. In this study, we performed both normal and multivariate conditional quantitative trait locus (QTL) analyses for plant height with spike length, internode number, length of the first internode to the sixth internode from the top during harvest, and photosynthesis traits at the seedling stage and heading stage based on a recombinant inbred line population. A total of 49 normal QTLs were detected, as well as 312 conditional QTLs. The genetic region Xbcd1970-Xbcd262 on chromosome 2D harbored the most QTLs, with 6 normal QTLs and 39 conditional QTLs. A comparison between the normal and conditional QTL mapping analyses suggested that the length of the third internode, fourth internode, and fifth internode from the top showed a high genetic association with plant height, whereas all photosynthesis traits showed weaker associations. This comparative analysis could serve as a platform for dissecting the genetic relation between objective traits and other phenotypic traits before manipulation of genes collocated with QTL clusters.
Highlights
Plant height is an important agronomic trait for morphogenesis and grain yield formation in wheat
Mao and coauthors demonstrated a negative association between plant height and Fusarium head blight resistance via a quantitative trait locus (QTL) metaanalysis of the results of fifty-six previous experiments[4]
The synthetic hexaploid parent of W7984 has more than six internodes, whereas Opata 85 has only five internodes
Summary
Plant height is an important agronomic trait for morphogenesis and grain yield formation in wheat. A comparison between the normal and conditional QTL mapping analyses suggested that the length of the third internode, fourth internode, and fifth internode from the top showed a high genetic association with plant height, whereas all photosynthesis traits showed weaker associations This comparative analysis could serve as a platform for dissecting the genetic relation between objective traits and other phenotypic traits before manipulation of genes collocated with QTL clusters. 25 Reduced height (Rht) genes have been identified across chromosomes 2A, 2B, 2D, 3B, 4A, 4B, 4D, 5A, 5D, 6A, 7A, and 7B in wheat[5,6] The introduction of these semidominant dwarfing alleles has reduced the plant height of modern wheat cultivars. We used a Scientific Reports | (2020) 10:12261
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