HYBRIDIZATION, GENOMIC CONSTITUTION AND GENERIC DELIMITATION IN ELYMUS SL (POACEAE, TRITICEAE)

被引:44
作者
ASSADI, M [1 ]
RUNEMARK, H [1 ]
机构
[1] LUND UNIV,DEPT SYSTEMAT BOT,S-22361 LUND,SWEDEN
关键词
POACEAE; TRITICEAE; ELYMUS; ELYTRIGIA; AGROPYRON; PSEUDOROEGNERIA; THINOPYRUM; LOPHOPYRUM; TRICHOPYRUM; HYBRIDIZATION; GENOME ANALYSIS; GENERIC DELIMITATION;
D O I
10.1007/BF00982855
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Intergeneric crosses were made between representatives of the genomically-defined genera Elymus, Agropyron, Elytrigia, Pseudoroegneria, and Thinopyrum. The genomic constitution of Elytrigia repens, the type species of Elytrigia, is shown to be SSH, a genomic combination otherwise found only in Elymus. The S genome of Pseudoroegneria has almost always a dominant influence on the morphology of the taxa of which it is a component. Wang (1989) showed that the J genome in Thinopyrum and the S genome have considerable homoeology, with a mean c-value of 0.35 in diploid SJ hybrids. A genetic coherence from S to SJ(e), J(e), J(e),J(b), and J(b) can be expected, agreeing with the continuous morphologic variation pattern observed. Because of the absence of morphological discontinuities between the taxa, Pseudoroegneria (S), Elymus (SH, SY, sometimes with additional genomes), Elytrigia (SSH, SSHX), and Thinopyrum (SJ, SJJ, J) are best treated as a single genus, Elymus, following the generic concept of Melderis in Flora Europaea and Flora of Turkey. The basic genomic constituents of Elymus will then be the S and/or J genomes. Agropyron, with diploids, tetraploids, and hexaploids based on the P genome is morphologically distinct from other genera in Triticeae. In a few species of Elymus and Pseudoroegneria, a P genome is an additional constituent. In these cases the P genome has a negligible morphological influence. Therefore, it seems reasonable to maintain Agropyron as a separate genus.
引用
收藏
页码:189 / 205
页数:17
相关论文
共 59 条
[1]  
[Anonymous], 1986, KEW B ADDIT SER
[2]   A TAXONOMIC REVISION OF PSATHYROSTACHYS (POACEAE) [J].
BADEN, C .
NORDIC JOURNAL OF BOTANY, 1991, 11 (01) :3-26
[3]  
BARKWORTH ME, 1983, GREAT BASIN NAT, V43, P561
[4]   ASSESSMENT OF THE GENOMIC SYSTEM OF CLASSIFICATION IN THE TRITICEAE [J].
BAUM, BR ;
ESTES, JR ;
GUPTA, PK .
AMERICAN JOURNAL OF BOTANY, 1987, 74 (09) :1388-1395
[5]  
Bentham G., 1881, J LINN SOC BOT, V19, P14, DOI DOI 10.1111/J.1095-8339.1881.TB00355.X
[6]  
Bor N.L., 1970, FLORA IRANICA, V70
[7]  
BOTHMER R, 1983, HEREDITAS, V99, P219
[8]  
BOTHMER R, 1991, ECOGEOGRAPHICAL STUD, V7
[9]  
Cauderon Y., 1966, Hereditas, V2, P218
[10]  
DEWEY D R, 1984, P209