Abstract
Oryza sativa and Luziola peruviana present a diploid chromosome number of 2n = 24 and basic number x = 12, confirmed by means metaphase chromosomes counts in young root tips of these species. Hybrid plants O. sativa × L. peruviana, with 2n = 24 chromosomes are originated from simple crosses and present abnormalities in the meiotic behavior, chromosomal aberrations and cytological alteration. This genetic incompatibility is caused by different factors as absence of pairing and recombination, different spindles arrangements, cytoskeleton instability, apoptosis process and chromosomal elimination, leading to micronuclei formation, unbalanced gametes and sterile pollen grains. The chromosome elimination is established as a dynamic process of stabilization of the genome that occurs during hybridization. It is a common phenomenon among intergeneric crosses and corresponds to cytoplasmic and nuclear bodies that reflect chromosomal aberrations resulting from the combination of two genomes with high genetic distance. The genomic conflict occurs in meiosis, possibly by asynchronism and cell cycle length of the genomes involved, or by time differences in replication between parental species leading to strand breaks and genomic rearrangements.
Highlights
Luziola genus presents unisexual flowers, the stamens and pistils in separate inflorescences [1]
The pollen mother cell (PMC) behavior in the progeny 2n = 24 chromosomes were varied; differences existing in the chromosome association degree (18-I, 3-II; 20-I, 2-II; 16-I, 4-II; 22-I, 1-II), multiples nucleoli, different spindles arrangements, cytoskeleton instability (Figure 2(D) and Figure 2(E)), loss of cytoplasm (Figures 2(A)-(H)), apoptosis process and pycnoticmasses (Figure 2(G) and Figure 2(H)), micronuclei formation (Figures 2(C)-(E)), unbalanced gametes and sterile pollen grains of different size were observed
Despite to all irregularities suffered by PMC, microsporogenesis occurred until pollen grains formation
Summary
Luziola genus presents unisexual flowers, the stamens and pistils in separate inflorescences [1]. Luziola peruviana presents a diploid chromosome number of 2n = 24 [2]. The Oryza genus presents bisexual flowers, sta-. (2014) Chromosome Elimination in Intergeneric Hybrid of Oryza sativa × Luziola peruviana. Mr Kuwada in 1910 reported by first time the chromosome number in O. sativa diploid, 2n = 24 chromosomes [5]. The metaphase chromosomes counts in young root tips of O. sativa and L. peruviana presented that are diploid species with a basic number x = 12, like other grass of the Oryzeae tribe, except Zizania, which presents a basic number x = 15, 17
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