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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 | | |
|---|
| 0 | PI 698812 | Kronos-vrn1vrn2-null | Triticum turgidum L. subsp. durum (Desf.) van Slageren | California, United States | NSGC |  | | 2021 | DEVELOPED | | | | | | Genetic material | Wild type Kronos (PI 576168) is a high yielding durum wheat line with a spring growth habit and excellent pasta
quality. The spring growth habit in wild type Kronos is determined by the dominant Vrn-A1 allele, which is
epistatic to the functional vrn-B1 allele for winter growth habit. In the absence of a functional Vrn-A1 locus the
plant requires vernalization for early flowering. The vrn1- null mutant flowers very late (Chen and Dubcovsky,
2012).
The Kronos vrn1-null mutant combines mutants vrn-A1 (Kronos T4-2268) and vrn-B1 (Kronos T4-2619). The vrn-
A1 allele has a splice site mutation at the end of intron 2 that resulted in a 1-bp frame shift mutation and a premature stop codon. The vrn-B1 allele has a splice site mutation that generates an immediate stop codon after the first exon (Chen and Dubcovsky, 2012). To accelerate flowering, the vrn1-null plants were crossed twice with the Kronos vrn2-null mutant developed before (Distelfeld et al. 2009). The selected plants deposited here are homozygous for loss-of-function alleles in both VRN1 and VRN2 homeologs (vrn1 vrn2-null) and head in approximately 80 days without vernalization. The phenotype of this mutant and its combinations with ful2 and ful3 mutants are described in Li et al. (2019). | 2116452 | PI 698812 |