Abstract
Starch was cytologically localized and biochemically assayed in different anther cell layers of Lilium cv. Enchantment during pollen development and its presence was correlated with anther growth. Two phases could be distinguished: the first, the growth phase, extends from the beginning of meiosis to the vacuolated microspore stage and corresponds to maximum increase in anther size and weight. During this period, microspores lack amyloplasts and starch is degraded in the outer staminal wall layers. The tapetum does not contain starch reserves but accumulates a PAS-positive substance in its vacuole. The second phase, the maturation phase, begins with the late vacuolated microspore stage and lasts until pollen maturation. Anther growth is slowed during this phase. A wave of amylogenesis/ amylolysis occurs first in the late vacuolated-microspores and young pollen grains and, next, in the staminal envelopes. In the pollen grain, the cytoplasm of the vegetative cell is filled with starch, but amyloplasts are not detected in the generative cell. When pollen grains ripen, amylaceous reserves are replaced with lipids. In the staminal envelopes, the second amylogenesis is particularly evident in the endothecium and the middle layers; the peak of starch is reached at the young bicellular pollen grain stage; starch disappears from the anther wall early during the maturation phase. The wave of amylogenesis/amylolysis occurring in the staminal envelopes during the maturation phase is peculiar to Lilium. It is interpreted as a sudden increase in carbohydrate level caused by lower anther needs when the growth is completed. Staminal envelopes may act as a physiological buffer and regulate soluble sugar level in the anther. Stages of anther growth correlate with starch content variations and this suggests that during the growth phase, products of starch hydrolysis in the staminal envelopes may be consumed partly by anther cell layers and partly by microspores.
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Clément, C., Chavant, L., Burrus, M. et al. Anther starch variations in Lilium during pollen development. Sexual Plant Reprod 7, 347–356 (1994). https://doi.org/10.1007/BF00230513
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DOI: https://doi.org/10.1007/BF00230513