000			01661nab a2200253 a 4500
003			AR-ReUNN
005			20260702003309.0
008			260630s2006 ag |||||||||||||||||eng
041	0		_aeng
100	1		_aYuhl, D. e. _9154524
700	1		_aMajumdar, S. K. _9154505
245	1	0	_aLight and electron microscope studies of Haworthia (Liliaceae) pollen / D. E. Yuhl; S. K. Majumdar
264		1	_c2006
300			_a7 páginas
500			_afot. byn.
520			_aPollen from 14 species of Haworthia (Family Liliaceae, Tribe Aloineae) were examined with the electron (scaning and transmission) and light microscopes. Optical microscope studies revealed a pollen size that depends upon the chromosome number; pollen grains of the diploid species are smaller than those from polyploid plants. Pollen grains are monoaperturate and, under the SEM, all 14 species display a perforated tectum. However, the proximal exine surface is smooth in some species and rough in others. The SEM study showed an identical tripartite ektexine composed of the foot layer, columellae and tectum in all species. The intine beneath the foot layer, however, exhibits certain variations in thickness. No differences in pollen fine structure of diploid and euploid plants could be detected. The need for further studies on the pollen ultrastructure was emphasized.
650		4	_aPolen _96254
650		4	_aHaworthia _9154525
650		4	_aLiliaceae _9115697
773	0		_tPhyton : Revista Internacional de Botánica Experimental = International Journal of Experimental Botany _x0031-9457 _gv. 41 n. 1-2 (1981) _w238927
942			_cART
035			_a(IBONE)34618
001			239018
999			_c239018 _d239018
040			_aAR-ReUNN _bspa _cAR-ReUNN _eaacr2