Fig. 1 Changes in microspore/pollen contents of anthers with
respect to bud/flower size and length. Note the close correlation
between bud/flower stage and microspore/pollen developmental
stages. Figures a–g show buds/flowers representative of the
ranges considered for this study. a 8–9 mm; b 10–11 mm;
c 12–13 mm; d 14–15 mm; e 16–17 mm; f 17–18 mm;
g 19 mm and beyond. Figures a0–g0 show the stages of
microspore/pollen development corresponding to bud/flowers
shown in a–g. a0 tetrads (t). b0 Young microspores. c0: Midvacuolate
microspores; note the progressive increase in size, the
adoption of a rounded shape and the presence of a central
vacuole (v) and a peripheral nucleus (n) in vacuolate microspores.
d0 Vacuolate microspores and YBP grains with a
generative (gn) and a vegetative nucleus (vn). e0 YBP. f0 Mid
bicellular pollen. g0 Mid-late, mature pollen; note the progressive
volume loss of maturing grains, becoming very dense, ovalshaped
mature pollen grains (asterisks). Bars a–g 1 cm; a0–g0
30 lm