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Grain yield trade-offs in spike-branching wheat can be mitigated by elite alleles affecting sink capacity and post-anthesis source activity.
- Source :
-
Journal of Experimental Botany . 1/1/2024, Vol. 75 Issue 1, p88-102. 15p. - Publication Year :
- 2024
-
Abstract
- Introducing variations in inflorescence architecture, such as the 'Miracle-Wheat' (Triticum turgidum convar. compositum (L.f.) Filat.) with a branching spike, has relevance for enhancing wheat grain yield. However, in the spike-branching genotypes, the increase in spikelet number is generally not translated into grain yield advantage because of reduced grains per spikelet and grain weight. Here, we investigated if such trade-offs might be a function of source–sink strength by using 385 recombinant inbred lines developed by intercrossing the spike-branching landrace TRI 984 and CIRNO C2008, an elite durum (T. durum L.) cultivar; they were genotyped using the 25K array. Various plant and spike architectural traits, including flag leaf, peduncle, and spike senescence rate, were phenotyped under field conditions for 2 consecutive years. On chromosome 5AL, we found a new modifier QTL for spike branching, branched head t 3 (bh t -A3), which was epistatic to the previously known bh t -A1 locus. Besides, bh t -A3 was associated with more grains per spikelet and a delay in flag leaf senescence rate. Importantly, favourable alleles, viz. bh t -A3 and grain protein content (gpc-B1) that delayed senescence, are required to improve grain number and grain weight in the spike-branching genotypes. In summary, achieving a balanced source–sink relationship might minimize grain yield trade-offs in Miracle-Wheat. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GRAIN yields
*EMMER wheat
*ALLELES
*CHROMOSOMES
*GENOTYPES
*DURUM wheat
Subjects
Details
- Language :
- English
- ISSN :
- 00220957
- Volume :
- 75
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Experimental Botany
- Publication Type :
- Academic Journal
- Accession number :
- 174386652
- Full Text :
- https://doi.org/10.1093/jxb/erad373