Abstract
The use of Aegilops speltoides Tausch cytoplasm in fertility restorer line breeding was evaluated by comparing the male fertility restoration and agronomic performance of segregating population pairs in Ae. speltoides and Triticum timopheevi Zhuk. cytoplasms. Each of 15 restorer/restorer (R/R), eight restorer/cultivar (R/B), and two male‐sterile/restorer (A/R) F1's was crossed onto ms(timopheevi)‘Butte’ and ms(speltoides)Butte or ms(timopheevi)ND537 sib and ms(speltoides)ND537 sib to obtain populations with comparable nuclear gene segregation in the two cytoplasms. There was no significant difference between F1 seed set of populations with T. timopheevi cytoplasm and those with Ae. speltoides cytoplasm (82% vs. 76%). F3 bulks from fertile plants in each population were evaluated in replicated yield trials. Populations in the two cytoplasms performed similarly for all agronomic and seed quality traits except anther extrusion. Populations with T. timopheevi cytoplasm had 10% higher mean anther extrusion than populations with Ae. speltoides cytoplasm. We believe Ae. speltoides cytoplasm can be used interchangeably with T. timopheevi cytoplasm in hybrid wheat breeding and provides an alternative which can effectively broaden cytoplasmic variability.
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