Table I.

Dynamics of microspore mother cells and meiotic products in tam anthers^a

Developmental Stage	MMC	2N 2C	3N 2C	3N 3C	4N 2C	4N 3C	4N 4C	(4–8)N (3–7)C
	%
Class 1 (4)b	15–46	54–64	0–9	0–4	0–5	0–5	0–3	0–4
Class 2 (6)	2–3	85–100	0–3	0–4	2–14	0–1	0–1	0–3
Class 3 (3)	–	48–62	2–9	0–8	2–42	3–17	2–13	3–4
Class 4 (5)	–	8–36	3–10	5–12	0–6	2–32	24–70	3–6

MMC, Microspore mother cells, which had one to two nuclei; N, nuclear no. in meiotic products; C, cell no. in meiotic products.

^a Anthers were assigned to four classes based on their developmental stages, as judged by the distribution of microspore mother cells and meiotic products. Class 1 was the least advanced in development because it had the highest percentage of microspore mother cells (one cell, one–two nuclei). Class 2 was more advanced than class 1 because it had a higher percentage of dyads (two cells) and a lower percentage of microspore mother cells. Class 3 was more advanced than class 2 because it no longer had microspore mother cells and had more tetrads than class 2. Class 4 was the most advanced because it had the highest percentage of tetrads. 

^b No. of anthers examined.