Date

Stage of development

23rd April, 2002-2003, 2011;

5th May, 2004

Pollen mother cell (PMC)

23rd, 24th April-6th May 2002-2003, 2011;

24th April-13th May, 2004

Meiosis of PMC

26th April-8th May, 2002; 27th April-13th May, 2003, 2011; 5th-11th May, 2004

Formation of tetrads

6th-11th May, 2002, 2004;

25th April-8th May, 2003, 2011;

Free microspores without air sacs

6th-11thMay, 2002; 28th April-13th May, 2003, 2011 5th-11th May, 2004

Free microspores with air sacs

7th-14th May, 2002, 2003, 2011; 17th May, 2004

Uninucleate microspore with large vacuole

12th May, 2002-2003, 2011;

23rd May, 2004

Matured pollen grains