Intraspecific variation in the pollen exine sculpture of Jaborosa runcinata Lam. (Solanaceae)

Figures & data

Figure 1 LM ofJaborosa runcinata pollen. A‐C. Slightly tilted equatorial view of pollen with incomplete reticulum. (A) High focus. (B) Low focus. (C) Mid focus showing the thin exine. D‐F. Polar view of pollen with a gemmate‐granular ectexine. (D) High focus. (E) Mid focus. (F) Mid focus showing the aspidate pores. Scale bars – 8 µm.

Figure 2 SEM images of the pollen ofJaborosa runcinata. A. General view of within sample variation. B. Equatorial view of pollen with incomplete reticulum, note large Ubisch body (arrow). C, D. Polar views of pollen grains with incomplete reticulate areas interspersed with a few gemmae. E. Pollen grain with gemmate‐granular ectexine, equatorial view. F. Pollen grain with granular ectexine, polar view. Scale bars – 10 µm.

Figure 3 Close up SEM images of the pollen ofJaborosa runcinata. A. Equatorial view showing the expanding pore with expanding aperture membrane, and the rudimentary colpus with microgranular surface structures. B. Detail of incomplete reticulum showing very short columellae, in association with the muri, over pollen grain surface C. Equatorial view showing an aspidate pore with aperture membrane in place. D. Detail of gemmate‐granular exine. Scale bars – 2 µm.

Table I. Percentages of the three sculptural variants in the ten flowers from two populations of Jaborosa runcinata.

Populations	Flowers	Anthers‐whole	Individual anther sacs	IR %	IR + Ge‐Gr %	Ge‐Gr %
Montevideo	1	A	Ai	58	25	17
			Aii	64	27	9
		B		68	20	12
		C		37	36	27
	2			16	33	50
	3			15	29	56
Miramar	4			‐	‐	100
	5			‐	25	75
	6			‐	10	90
	7					100
	8			‐	70	30
	9			‐	44	56
	10			‐	‐	100
IR – incomplete reticulate; IR + Ge‐Gr – a combination of incomplete reticulate with gemmate‐granular; Ge‐Gr – gemmate‐granular.1(A‐C): counting from pollen sacs or an individual anther of the same flower;2‐10: pollen counted unselectively from anthers within the androecium of an individual flower.