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- W4386947366 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 RILs 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 two consecutive years. On Chr 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 RILs. In summary, achieving a balanced source-sink relationship might minimise grain yield trade-offs in Miracle-Wheat." @default.
- W4386947366 created "2023-09-23" @default.
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- W4386947366 date "2023-09-22" @default.
- W4386947366 modified "2023-10-03" @default.
- W4386947366 title "Grain yield trade-offs in spike-branching wheat can be mitigated by elite alleles affecting sink capacity and post-anthesis source activity" @default.
- W4386947366 doi "https://doi.org/10.1093/jxb/erad373" @default.
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- W4386947366 hasPublicationYear "2023" @default.
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