HOMOLOGY OF CHROMOSOMES OF THE X GENOMES IN COMMON AND URUGUAYAN DALLISGRASS, PASPALUM-DILATATUM

被引:20
作者
BURSON, BL
机构
关键词
MEIOSIS; INTRASPECIFIC HYBRIDIZATION; CHROMOSOME PAIRING; GENOME RELATIONS; APOMIXIS;
D O I
10.1139/g91-147
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Two biotypes of dallisgrass, Paspalum dilatatum Poir., designated common and Uruguayan, have chromosome numbers and genome formulas of 2n = 5x = 50 (IIJJX) and 2n = 6x = 60 (IIJJXX), respectively. The relationship between the X genomes in these two biotypes is unknown, and each was arbitrarily assigned the letter X to designate an unknown genome. This study was undertaken to determine the relationship between the X genomes in these two biotypes. Because both biotypes are apomicts and cannot be crossed, a sexual intraspecific F1 hybrid (2n = 45) between sexual yellow-anthered (2n = 4x = 40; IIJJ) and common dallisgrass biotypes was crossed with Uruguayan dallisgrass. This F1 hybrid has complete sets of the I and J genomes but only 5 of the 10 chromosomes of the X genome from common dallisgrass. Two hybrids were recovered. One had 52 and the other had 53 chromosomes, which associated at metaphase I as 22 bivalents + 8 univalents and 23 bivalents + 7 univalents, respectively. Twenty bivalents represent pairing of members of the I and J genomes, and those in excess of 20 represent pairing between members of the two X genomes. The remaining members of the X genome from the Uruguayan biotype were present as univalents at metaphase I. This demonstrates that those chromosomes of the X genome from the common biotype that were present are homologous to members of the X genome of the Uruguayan biotype. Both hybrids are aposporous facultative apomicts with some sterility.
引用
收藏
页码:950 / 953
页数:4
相关论文
共 13 条
[1]  
BASHAW E. C., 1958, AGRON JOUR, V50, P441
[2]  
BASHAW E. C, 1958, AGRON JOUR, V50, P753
[3]   INTRASPECIFIC HYBRIDIZATION IN DALLISGRASS, PASPALUM-DILATATUN POIR [J].
BENNETT, HW ;
BURSON, BL ;
BASHAW, EC .
CROP SCIENCE, 1969, 9 (06) :807-&
[4]   CHROMOSOME NUMBERS, MICROSPOROGENESIS, AND MODE OF REPRODUCTION OF 7 PASPALUM SPECIES [J].
BURSON, BL ;
BENNETT, HW .
CROP SCIENCE, 1971, 11 (02) :292-&
[5]   GENOME RELATIONS BETWEEN AN INTRASPECIFIC PASPALUM-DILATATUM HYBRID AND 2 DIPLOID PASPALUM SPECIES [J].
BURSON, BL ;
BENNETT, HW .
CANADIAN JOURNAL OF GENETICS AND CYTOLOGY, 1972, 14 (03) :609-&
[6]   GENOME RELATIONSHIPS BETWEEN TETRAPLOID AND HEXAPLOID BIOTYPES OF DALLISGRASS, PASPALUM-DILATATUM [J].
BURSON, BL .
BOTANICAL GAZETTE, 1991, 152 (02) :219-223
[7]   GENOME RELATIONS BETWEEN PASPALUM-CONSPERSUM AND 2 DIPLOID PASPALUM SPECIES [J].
BURSON, BL .
CANADIAN JOURNAL OF GENETICS AND CYTOLOGY, 1978, 20 (03) :365-372
[8]   CYTOLOGY OF PASPALUM-CHACOENCE AND PASPALUM-DURIFOLIUM AND THEIR RELATIONSHIP TO P-DILATATUM [J].
BURSON, BL .
BOTANICAL GAZETTE, 1985, 146 (01) :124-129
[9]   CYTOLOGY, REPRODUCTIVE-BEHAVIOR, AND FORAGE POTENTIAL OF HEXAPLOID DALLISGRASS BIOTYPES [J].
BURSON, BL ;
VOIGT, PW ;
EVERS, GW .
CROP SCIENCE, 1991, 31 (03) :636-641
[10]   GENOME RELATIONS BETWEEN TETRAPLOID PASPALUM-DILATATUM AND 4 DIPLOID PASPALUM SPECIES [J].
BURSON, BL ;
LEE, H ;
BENNETT, HW .
CROP SCIENCE, 1973, 13 (06) :739-743