The behavior of pollination drop secretion in Ginkgo biloba L.

Biao Jin, Xiaoxue Jiang, Di Wang, Lei Zhang, Yinglang Wan, Li Wang

Plant signaling & behavior 2012 Sep 01

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Pollination drop (PD) secretion plays a critical role in wind pollination in many gymnosperms. We conducted detailed investigations on PD secretion in Ginkgo biloba, and found that PDs could not form when the micropyle was removed, but were able to form after removal of the shoot, leaves, ovular stalk, or ovular collar. The duration and volume of the PD increased under high relative humidity, but addition of salt or sugar did not affect PD secretion, its size, or its duration. Morphological and anatomical observations showed that many secretion cells at the nucellus tip contributed to secreting the PD after the formation of pollen chamber. Under laboratory conditions, the PD persisted for approximately 10 d if not pollinated, and re-formed five times after it was removed, with the total volume of PDs reaching approximately 0.4 μL. These results suggested that PDs can be continuously secreted by the tip of the nucellus cells during the pollination stage to increase the chance of capturing pollen from the air. Importantly, PD secretion is an independent behavior of the ovule and PDs were produced apoplastically.

Citation

Biao Jin, Xiaoxue Jiang, Di Wang, Lei Zhang, Yinglang Wan, Li Wang. The behavior of pollination drop secretion in Ginkgo biloba L. Plant signaling & behavior. 2012 Sep 01;7(9):1168-76