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Studies on Flowering Habit, Pollen Morphology and Activity of Irwin Mango (Mangifera indica L.) |
Abstract
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| Flowering behavior | |
 Male
flowers
of Irwin mango opened mostly during 5 pm to 7 am and were fully opened
before 7 am. The few opening during the rest of the day usually were not
fully opened until the next morning. The yellowish petals of young fresh
flowers turned red when aging.
The redish-purple anthers darkened as well. Dehiscence occurred mainly
between 10 am to 2 pm. Dehiscence can be depressed by low temperature
(below 15 C). Flowers lasted up to 5 days. Hermaphrodite flowers
behaved similar to male flowers. However, the ovaries usually turned greenish
and enlarged as flowers aging. |
| Pollen morphology | |
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Sculpture of exine: mesocolpia striatoreticulate; apocolpia reticulate; lumina irregular. No significance between pollen from male flower and hermaphrodite flower was observed. |
Polar
view circular or semiangular 3-colporate; pollen grains from male flower
prolate to peroblate spheroidal, 29.7 to 39.6 um (average 32.4
um) x 23.7 to 29.7 um (average 27.4 um), P/E =
1.07 to 1.43 um (average 1.18 um);
pollen grains from hermaphrodite flower subprolate to spheroidal, 29.7
to 35.7 um (average 31.4 um) x 25.7 to 31.9 um
(average 28.4 um), P/E = 1.00 to 1.29 (average 1.11 um).
Significant differences in polar axis, equatorial axis, and P/E were
observed; pollen from male flower 12833 um3; pollen from hermaphrodite
flower 13277 um3, the later is 3.5 % larger.
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