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Zhe Cao, Zhanao Deng, and Mike Mclaughlin

classification. The characteristics commonly examined in caladium include floral and inflorescence morphologies, leaf shape and coloration pattern, and tuber morphology. Cytogenetic information such as chromosome number has not been used in the classification of

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Min Deng, Jianjun Chen, Richard J. Henny, and Qiansheng Li

nation in croton production ( Brown, 1995 ). However, there is no information regarding the cytology of crotons cultivated in Florida. The objectives of this study were to examine the chromosome number and karyotype of selected crotons cultivated in

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A. Estilai, A. Hashemi, and K. Truman

Edible chia seeds, purchased from the local markets in Guatemala, Mexico, and southern California, were used for species identification, chromosome counts, karyotype construction, and meiotic analyses. Plants raised from those seeds had ovate leaves, dense racemose inflorescences, pale-blue flowers, and were identified from herbarium specimens as Salvia hispanica L. Mitotic analyses of root tips from 50 plants showed 2n = 12—the lowest chromosome number in the genus. Chromosomes were small, ranging from 2 to 3.5 pm. One pair of chromosomes was metacentric (with the long arm: short arm ratio, r = 1.5), four pairs were submetacentric (r = 2.6 to 3.6), and one pair was telocentric (r = 12). Meiosis was regular and six bivalents were observed at metaphase I. Ring and rod bivalents averaged 1.53 ± 1.05 and 4.47 ± 1.05, respectively;

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Pablo Bolaños-Villegas, Shih-Wen Chin, and Fure-Chyi Chen

-generation hybrids ( Kamemoto et al., 1999 ). Differences in ploidy are a challenge to the development of new hybrids, and differences in chromosome number may prevent zygote development after pollination ( Singh and Hymowitz, 1987 ). Chromosome doubling is often

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Yu-Chu Chang, Chou-Tou Shii, and Mei-Chu Chung

chromosome number and karyotypes, posing a considerable challenge in studying their phylogenetic relationships ( Kurita and Hsu, 1998 ). In natural habitats, interspecific hybridization is frequent and has been proven to be an important mode of speciation in

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Ryan N. Contreras and John M. Ruter

-values Database ( Bennett and Leitch, 2005 ) currently contains data for 5150 species; however, no genome size estimates have been reported for Callicarpa . Chromosome number has been a useful tool for researchers investigating evolutionary relationships ( Guerra

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Juan Chen, Nianhe Xia, Xiaoming Wang, Richard C. Beeson Jr., and Jianjun Chen

blue honeysuckle, is a shrub producing edible fruits ( Miyashita et al., 2011 ). Despite their economic importance, chromosome numbers have only been documented in less than 30% of the described species based on the index to plant chromosome number

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Juan Chen, Nianhe Xia, Jietang Zhao, Jianjun Chen, and Richard J. Henny

-Škorničková et al. (2007) , respectively. The chromosome number of C. aromatica was reported to be 2 n = 42 ( Leong-Škorničková et al., 2007 ; Raghavan and Venkatsubban, 1943 ), 63 ( Islam, 2004 ; Leong-Škorničková et al., 2007 ; Liu, 1985 ; Ramachandran

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S. Brooks Parrish, Renjuan Qian, and Zhanao Deng

have focused most attention on L. camara. Patermann (1938) was the first to report a chromosome number for the Lantana genus, identifying L. trifolia as 2 n = 48. Since then, a range of ploidy levels have been identified in L. camara , from 2

Open access

Renjuan Qian, S. Brooks Parrish, Sandra B. Wilson, Gary W. Knox, and Zhanao Deng

pollen grains. Chromosome number and ploidy level are important plant characteristics; the latter is an important factor in determining plant fertility and hybridization potential. It was previously reported that the porterweed genus has varying numbers