The evolution of pollen germination timing in flowering plants: Austrobaileya scandens (Austrobaileyaceae).

AoB Plants
Joseph H Williams

Abstract

The pollination to fertilization process (progamic phase) is thought to have become greatly abbreviated with the origin of flowering plants. In order to understand what developmental mechanisms enabled the speeding of fertilization, comparative data are needed from across the group, especially from early-divergent lineages. I studied the pollen germination process of Austrobaileya scandens, a perennial vine endemic to the Wet Tropics area of northeastern Queensland, Australia, and a member of the ancient angiosperm lineage, Austrobaileyales. I used in vivo and in vitro hand pollinations and timed collections to study development from late pollen maturation to just after germination. Then I compared the contribution of pollen germination timing to progamic phase duration in 131 angiosperm species (65 families). Mature pollen of Austrobaileya was bicellular, starchless and moderately dehydrated-water content was 31.5 % by weight and volume increased by 57.9 % upon hydration. A callose layer in the inner intine appeared only after pollination. In vivo pollen germination followed a logarithmic curve, rising from 28 % at 1 hour after pollination (hap) to 97 % at 12 hap (R(2) = 0.98). Sufficient pollen germination to fertilize all ov...Continue Reading

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Citations

Feb 24, 2016·Frontiers in Plant Science·Jorge LoraMaría Herrero
Mar 11, 2016·American Journal of Botany·Ana Maria Vieira, José A Feijó
Oct 24, 2014·Frontiers in Plant Science·Thomas E Marler, Anders J Lindström
Nov 25, 2016·Frontiers in Plant Science·Juliana A Pérez Di GiorgioGabriela Amodeo
Jul 30, 2021·Current Biology : CB·Shawn M ChristensenRachel L Vannette

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Methods Mentioned

BETA
fluorescence microscopy
electron microscopy

Software Mentioned

Axiovision
Adobe Photoshop

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