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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 659454 | Tx3361 | Sorghum bicolor (L.) Moench | Texas, United States | NLGRP | | Not Available | 2010 | DEVELOPED | 2010 | | | | | Breeding material | The Iap (Inhibition of Alien Pollen) locus is one cause of reproductive isolation between cultivated sorghum and wild sorghum species outisde the Eu-Sorghum section. In the homozygous recessive condition, the iap iap genotype eliminates this reproductive isolation barrier and allows hybrids to be recovered between S. bicolor and wild Sorghum relatives. Tx3361 is an agronomically improved S. bicolor germplasm possessing the iap iap genotype and segragating at the Ms3 genetic male sterility locus to facilitate hybridization. Tx3361 was selected, evaluated and increased in the TX Agrilife Res. sorghum breeding program at Collegte Station, TX. The germplasm was developed from a cross between genetic male-sterile BTx623, an unreleased derivative of BTx623 containing the ms3 allele for genetic male-sterility, and NR481, an unreleased line homozygous for the iap allele . The hybrid was backcrossed once to the BTx623ms3 parent. BC1F2 progeny were grown in a greenhouse and tested for maize pollen tube growth to identify iap iap genotypes. Selected iap iap individuals were self pollinated and evaluated for lodging, height, awns, and segragation of the ms3 allele. Selected male-fertile and sterile plants (BC1F3) within ms3 segragating rows were sib-mated. Individual sib crosses were evaluated for stable backcross segragation of ms3, lodging, height, maturity, and the iap iap genotype. Selected sib crosses were bulk sib-mated between male-sterile and fertile plants to produce breeder's seed of Tx3361. Maintains sterility in the A1 cytoplasmic male sterility system. Genetically a three dwarf with height similar to most grain sorghum parental lines. Is 10-12 d earlier than BTx623 in all environments and lodging in Tx3361 and BTx623 were similar. Penetrance of the iap iap genotype, based on maize pollen tube growth to the base of the style is environmentally influenced. | 1840169 | PI 659454 |