Research Article

Related GMR Articles

Calliandra; karyotypic evolution; Mimosoideae; Polyploidy

Most members of the subfamily Mimosoideae have pantropical distributions, variable habits, and a basic chromosome number x = 13. We examined karyotypic evolution of 27 species of this subfamily occurring principally in northeastern Brazil by examining chromosomes stained with Giemsa. All of the species had semi-reticulated interphase nuclei and early condensing segments in the ... more

E.C.X.R. Santos; R. Carvalho; E.M. Almeida; L.P. Felix
Cytomixis; Houttuynia cordata; Meiosis; Microsporogenesis; Polyploidy

Houttuynia cordata (Saururaceae) is a leaf vegetable and a medicinal herb througout much of Asia. Cytomixis and meiotic abnormalities during microsporogenesis were found in two populations of H. cordata with different ploidy levels (2n = 38, 96). Cytomixis occurred in pollen mother cells during meiosis at high frequencies and with variable degrees of chromatin/ ... more

J.Z. Guan; J.J. Wang; Z.H. Cheng; Y. Liu; Z.Y. Li
Cytomixis; Meiosis; Microsporogenesis; Pinellia ternata; Polyploidy

Pinellia ternata is an important traditional Chinese medicinal plant. Its different populations in China have various ploidy levels, based on x = 13, as well as extensive aneuploid series. The microsporogenesis process was observed in specimens from three populations from three regions of Hubei Province; they were characterized by normal and abnormal meiotic divisions in ... more

Y. Liu; R.K. Hui; R.N. Deng; J.J. Wang; M. Wang; Z.Y. Li
Microsatellite; Multiplex; Polyploidy; Puccinellia maritima; Saltmarsh

The grass Puccinellia maritima is an important saltmarsh ecosystem engineer exhibiting wide morphological variation, which is partially genetically determined. Nevertheless, nothing is known about its population genetics or how neutral genetic variation is distributed throughout its geographical range. Here, we describe 12 polymorphic microsatellites pooled into two multiplexes ... more

R. Rouger; M. Vallejo-Marin; A.S. Jump
Crucian carp; Distant hybridization; Gene expression; jnk1 gene; Molecular cloning; Polyploidy

c-Jun N-terminal kinase (JNK) is an important member of the mitogen-activated protein kinase superfamily. The allotetraploid crucian carp is a product of distant hybridization of female red crucian carp with male common carp. It is the first natural case of an allotetraploid with stable genetic characters, including fertility of both female and male animals. In this study, 2 jnk1 ... more

Y.M. Xiao; M.G. Jiang; Z.W. Luo; Y.H. Zhou; S. Wen; M. Wang; C. Zhang; S.J. Liu
Hexaploidy; Interspecific hybridization; Meiosis; Poaceae; Polyploidy

Cytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with both chromatids. After alignment at the metaphase plate ... more

R.A.Bernardo Filho; A.C.C. Santos; F.H.D. Souza; J.F.M. Valls; M.S. Pagliarini
Antlion; Chromatin; Endoreduplication; Malpighian tubules; Neuroptera; Polyploidy

Myrmeleon unifomis Malpighian tubules cells were analyzed under two aspects: chro­matin structure and total protein quantification in the three larval phases (L1, L2 and L3) and in adults. This insect Malpighian tubules present polyploid tissue resultant from endoreduplica­tion, which probably begins in the first larval phases. The Malpighian ... more

C.A. Pacheco; T.L. da Silva; M.K.H. Kobayashi
Ehd1-4; Intra-differentiation; Introgression; Oryza rufipogon; Oryza sativa

Twenty-five populations of Oryza rufipogon from China and 144 cultivars of Oryza sativa were selected for this study. Based on the DNA fragment of Ehd1-4 and subspecies-specific sequence-tagged site markers in different chromosomes, intraspecific differentiation in O. rufipogon from China was analyzed. The introgression from O. sativa to O. ... more

Y.B. Dong; F. Li; X.W. Pei; F. Wang; Q.H. Yuan; H.J. Wu; S.R. Jia; Y.F. Peng
Antixenosis; bph resistance gene; Brown planthopper [Nilaparvata lugens (Stål)]; Gene mapping; Oryza sativa

The brown planthopper [Nilaparvata lugens (Stål); BPH] has caused severe damage to rice production. The identification of resistance genes and the development of BPH-resistant varieties are economical and effective ways to manage this pest. Using an F2 population from a cross between the Indica cultivars 93-11 and Swarnalata, we mapped the Qbph-8 ... more

Y.F. Qiu; L. Cheng; F. Liu; R.B. Li
Cold tolerance; Oryza rufipogon; Oryza sativa; OsGI; Phylogenetic network; Seed dormancy

We analyzed intron 9 of the OsGI gene in Oryza rufipogon and Oryza sativa in order to investigate evolutionary relationships in rice and the relationship between intron variation and phenotype. OsGI-9 was cloned in 38 O. rufipogon populations and in 139 O. sativa cultivars and the phylogeny was reconstructed. Seed cold tolerance and ... more

Y. Dong; Z. Chen; X. Pei; F. Wang; Q. Yuan; H. Wu; S. Jia; Y. Peng