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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 702421 | Kronos platz-A1 platz-B1 combined knock-out | Triticum turgidum L. subsp. durum (Desf.) van Slageren | California, United States | NSGC |  | | 2023 | DEVELOPED | | | | | | Genetic material | Kronos is a spring durum wheat that carries a functional Vrn-A1 allele for spring growth habit and the Ppd-A1a allele for reduced photoperiodic response. We screened the sequenced EMS mutagenized population of tetraploid Kronos (Krasileva et al. 2017) for mutations in the TraesCS6A02G156600 (PLATZ-A1) and TraesCS6B02G282400LC (PLATZ-B1) genes. The platz-A1 mutant was developed from line K2557, which carries a mutation in the acceptor splice site of the 3rd intron (RefSeqv1.1 chromosome 6A: 145,651,705). This mutation results in a major transcript variant with a premature stop codon and a less abundant variant with 21 bp deletion of a very conserved region of the PLATZ1 gene. The platz-B1 mutant was developed from line K86, which carries a mutation predicted to change an arginine at position 69 to cysteine (R69C) in the second exon of gene PLATZ-B1 (RefSeqv1.1 chromosome 6B: 207,805,286). The R69C mutation is located within the PLATZ conserved domain and is expected to have a disruptive effect in protein structure and function based on a negative BLOSUM62 (-3) and very low SIFT score (0). Each mutation was backcrossed four times to the non-mutagenized Kronos to reduce the mutation load and then the A- and B- genome BC4F1 mutants were intercrossed to generate the combined platz-A1 platz-B1 loss-of-function mutant. Plants homozygous for both mutations were selected in the BC4F2 progeny using molecular markers (Zhang J. et al. 2023). The combined platz-A1 platz-B1 mutant showed reduced plant height (13%) and peduncle length (19%) relative to the wild type. The reductions were smaller in the single mutants. These mutations can be used to modulate wheat plant height (Zhang J et al. 2023). | 2141624 | PI 702421 |