Possible origin of Triticum petropavlovskyi based on cytological analyses of crosses between T. petropavlovskyi and tetraploid, hexaploid, and synthetic hexaploid (SHW-DPW) wheat accessions

Qian Chen,Li-Yuan Xu,Jun Song,Gui-Rong Yu,Wen-Ping Du

doi:10.5424/sjar/2016144-8476

Abstract

Intraspecific hybridization between Triticum petropavlovskyi Udacz. et Migusch., synthetic hexaploid wheat (SHW-DPW), and tetraploid and hexaploid wheat, was performed to collect data on seed set, fertility of F1 hybrid, and meiotic pairing configuration, aiming to evaluate the possible origin of T. petropavlovskyi. Our data showed that (1) seed set of crosses T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum cv. Chinese Spring was significantly high; (2) fertility of hybrids T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum ssp. yunnanense was higher than that of the other hybrids; (3) fertility of F1 hybrids SHW-DPW × T. dicoccoides and SHW-DPW×T. aestivum ssp. tibetanum was significantly high; and (4) c-value of T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum cv. Changning white wheat was also significantly high. The results indicate that the probable origin of T. petropavlovskyi is divergence from a natural cross between T. aestivum and T. polonicum, via either spontaneous introgression or breeding effort.

Highlights

IntroductionNumerous studies on morphology and cytogenetics indicated that these landraces have the primitive and stable chromosomal constitution AABBDD (Riley et al, 1967; Shao et al, 1980; Yao et al, 1983; Chen et al., 1985; Yang et al, 1992)
Twenty-nine accessions were used in this study (Table 1), which included: nine accessions of T. petropavlovskyi; six accessions of the other three unique Chinese endemic wheat landraces; one accession of T. carthlicum, T. dicoccoides, and T. turanicum; two accessions of T. durum, T. turgidum, T. polonicum, and T. compactum; T. aestivum cv
The relationship between T. petropavlovskyi and T. polonicum was found to be distant compared to other tetraploid wheat landraces (Yao et al, 1983; Chen et al, 1985)

Summary

Introduction

Numerous studies on morphology and cytogenetics indicated that these landraces have the primitive and stable chromosomal constitution AABBDD (Riley et al, 1967; Shao et al, 1980; Yao et al, 1983; Chen et al., 1985; Yang et al, 1992). Previous studies pointed out that T. petropavlovskyi has some primitive traits that distinguish it from Triticum spelta L. and the common wheat of East-Mediterranean origin (Yao et al, 1983; Chen et al, 1988; Yen et al, 1988). Phylogenetic analyses have indicated that T. petropavlovskyi originated from T. polonicum in Xinjiang and from the exotic landraces of T. aestivum via either spontaneous introgression or breeding effort (Kang et al, 2010; Chen et al, 2013)

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