Microsporogenesis

Meiotic behavior and chromosome number of Urochloa adspersa (Trin.) R. D. Webster from the Brazilian Chaco

M. F. Felismino, Maior, R. L. S., Damasceno, Jr., G. A., Pott, A., and Pagliarini, M. S., Meiotic behavior and chromosome number of Urochloa adspersa (Trin.) R. D. Webster from the Brazilian Chaco, vol. 14, pp. 7455-7462, 2015.

This is the first report of meiotic division in Uro­chloa adspersa (Trin.) collected from the Brazilian Chaco. Meiotic analyses were performed on three specimens of U. adspersa named G10, G15, and G16. Inflorescences were collected and fixed in a mixture of ethanol and acetic acid (3:1, v/v) for 24 h and then stored in 70% alcohol. Diakinesis revealed different chromosome numbers and ploidy levels. All three plants were polyploids: G10 and G15 exhibited 2n = 6x = 54 chromosomes (arranged in 27 bivalents), while G16 exhibited 2n = 4x = 36 chromosomes (18 bivalents).

A cytological study of anther and pollen development in Camellia oleifera

C. Gao, Yuan, D. Y., Wang, B. F., Yang, Y., Liu, D. M., and Han, Z. Q., A cytological study of anther and pollen development in Camellia oleifera, vol. 14, pp. 8755-8765, 2015.

The plant species Camellia oleifera is an important producer of edible oil in China. However, it suffers from a low fruit-setting rate. This study used high resolution scanning electron microscopy of semi-thin tissue sections to investigate anther development and pollen formation, and to determine whether problems in forming functional pollen cause low seed setting rates. During anther development, cell sizes within the epidermis and end othecium gradually increase, and at the beginning of the microsporocyte phase, the cells become highly vacuolated.

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