Genomic constitution of the allo-octoploid Elymus tenuis (Poaceae: Triticeae) of New Zealand
Hai-Qin Zhang A B , Xue Bai A B , Bao-Rong Lu C , Henry E. Connor D E and Yong-Hong Zhou A B EA Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China.
B Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Yaan 625014, Sichuan, China.
C The Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, China.
D Department of Geography, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
E Corresponding authors. Email for Y.-H. Zhou: zhouyh@sicau.edu.cn
Australian Systematic Botany 23(5) 381-385 https://doi.org/10.1071/SB10014
Submitted: 29 March 2010 Accepted: 28 July 2010 Published: 3 November 2010
Abstract
Elymus tenuis (Buch.) Á.Löve et Connor is a perennial octoploid (2n = 56) wheatgrass endemic to New Zealand. To investigate its genomic constitution, four artificial interspecific hybrids between E. tenuis and E. enysii (2n = 4x = 28, HW), and E. solandri (2n = 6x = 42, StYW) and E. multiflorus (2n = 6x = 42, StYW) were studied cytologically. Meioses in pollen mother cells (PMCs) of the hybrids showed relatively high chromosome pairing, with an average of 13.50 in E. enysii × E. tenuis, 20.22 in E. solandri × E. tenuis, 19.62 in E. multiflorus × E. tenuis, and 20.00 in E. tenuis × E. multiflorus bivalents per cell, respectively. The results indicate that E. tenuis is an allo-octoploid species, with the new and unique genomic constitution StYHW. An autochthonous origin is proposed for it.
Ackowledgements
We thank J. B. Hair (1909–1979) at Botany Division, Department of Scientific and Industrial Research, Lincoln, New Zealand, for the assessment of interspecific crossability, prepared slides and of the fertility of the hybrids. We also thank the Director of the Allan Herbarium (CHR) New Zealand, for the loan of the permanent chromosome slides of species and hybrids. We are grateful to Dr Mary E. Barkworth for her valuable comments on the manuscript. This study was support by grants from the National Natural Science Foundation of China (Nos 30901052, 30870154), and the Natural Science Foundation for Young Scientists of Sichuan Province, China (No. 08ZQ026-036).
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