科研之友
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摘要
Investigation in 20 accessions of Citrullus lanatus (＆egusi＊ melon) revealed somatic chromosome counts ranging from 18 to 24 with 2n = 22 being the most frequent. Polyploid counts of 2n = 40 and 2n =44 were made for accessions DD98/4 and L6, respectively. Diploid chromosome counts varying from 2n = 22 suggest aneuploid changes in chromosome number or can be attributed to counting difficulties caused by the overlapping of the sticky small chromosomes. The polyploid counts were exact multiples of the diploid numbers, suggesting occurrence of polyploid forms/cultivars of the species. The high yield performance observed for L6 as reflected in the fruit size and weight is a reflection of gigas effect that is characteristic of polyploid genomes. The study reveals that knowledge of chromosome counts and character expression will be useful in the selection of genotypes for hybridization purposes.
