Breeding relationships in the genus Brachypodium (Poaceae: Pooideae)

被引:49
作者
Khan, MA
Stace, CA
机构
[1] Quaid I Azam Univ, Dept Biol Sci, Islamabad, Pakistan
[2] Univ Leicester, Dept Biol, Leicester LE1 7RH, Leics, England
关键词
D O I
10.1111/j.1756-1051.1999.tb01108.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Results of hybridisation experiments involving five perennial European species of Brachypodium (B. sylvaticum, B. glaucovirens, B. pinnatum, B. phoenicoides and B. retusum), the annual B. distachyon, and the C. American perennial B. mexicanum are presented. Four of the European perennials are largely self-incompatible, whereas B. sylvaticum, B. distachyon and B. mexicanum are highly self-compatible. Despite their avowed ancient and relict status, the European species have mostly retained the ability to interbreed and produce viable F-1 hybrids: The F-1 hybrids obtained between the five European perennials all exhibit some degree of fertility. Hybrids between. distachyon and at least some of the European perennials are vigorous and long-lived, but show no evidence of fertility. No hybrids involving B. mexicanum could be raised. Success in raising hybrids, and the degree of fertility of such hybrids, partly agrees with closeness of taxonomic relationships as measured by morphological, anatomical, biochemical and molecular characteristics, but also with closeness in chromosome number irrespective of taxonomic affinity. Hence some interspecific hybrids are more easily produced and are more fertile than certain intraspecific hybrids involving parents of different chromosome number. All hybrids form good numbers of bivalents, but meiosis Varies from almost regular in hybrids between European perennials with the same chromosome number to very irregular in hybrids between B. distachyon and any perennial species.
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页码:257 / 269
页数:13
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