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gender differentiation mechanism in Vitis species. In the present study, we 1) focused on the abortion of pistil and its recovery from the perspective of cytology and 2) aimed to provide a more theoretical basis for gender determination mechanism in

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pollen viability was low. Nonetheless, the structural events of anther development involved in petaloid-type male sterility in C. oleifera remain unknown. Therefore, in our study, we examined the anther structure and pollen morphology for a cytological

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pollen and cytological traits. The objectives of this study are to characterize fully the chromosome and pollen morphology, pollen stainability, and nuclear DNA content of gulf vervain. Materials and Methods Plant materials. Gulf vervain

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biomass and to improve medicinal and ornamental characteristics. In the present study, the induction of polyploid on feverfew was examined and morphological, physiological, cytological, and phytochemical characteristics of diploid and induced

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., 2012 ; Deng et al., 2017 ). The objective of this study was to assess morphological and cytological differences among eight trailing lantana varieties collected from different growers and a naturalized area in Texas and Australia. Information in these

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were examined by ESEM (Quanta 200; FEI, Eindhoven, The Netherlands) in their natural form without additional sample preparation. Results Cytological characteristics of embryonic callus cells. Histologically, embryonic calli were composed of two

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can provide greater insight into a genus and thus aid in developing breeding strategies. The base chromosome number of Acer is x = 13. Cytological reports for maples include a range of ploidy levels ( Darlington and Wylie, 1956 ). The greatest

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alter breeding strategy ( Fehr, 1991 ). Unfortunately, relative to the number of species in the genus, the cytological information is sparse for Callicarpa . The first beautyberry chromosome count reported was for C. japonica (2 n = 32) by Sugiura

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pair composition was calculated as GC% = 100 – AT%. Relative genome size was measured on a flow cytometer (CyFlow Ploidy Analyzer, Sysmex) with fluorescence excitation of 365 nm for DAPI-stained samples and 532 nm for PI-stained samples. Cytology

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Abstract

The pansy, Viola tricolor Hortensis, L. is a popular bedding plant, however, the problem of low seed set has hindered genetic studies, plant breeding efforts, and the production of Fl hybrids. Twenty-nine commercial inbred pansy lines were investigated cytologically to establish a possible relationship between chromosome number and pollen fertility. The somatic chromosome number of all lines studied was found to be 2n=48 and pollen fertility was above 90 percent. Preliminary hybridization investigations suggest the problem may be an incompatibility system.

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