Pollen in hydrophilous angiosperms

Pettitt, J. M.; Jermy, A. C.

doi:10.1016/0047-7206(74)90023-5

Cited by 27 publications

(24 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ruppia maritima (Ruppiaceae) and Potamogeton pectinatus (Potamogetonaceae), which must be pollinated by bubbles under water (Verhoeven 1979), share a reticulate exine and a thin continuous foot layer. On the other hand, P. natans has a reticulate exine, as does P. pectinatus, in spite of being anemophilous (Pettitt and Jermy 1975). Moreover, Walker (1976) stated that elaborate pollen sculpture seems to correlate with entomophily and that psilate pollen grains may be characteristic of anemophilous plants.…”

Section: Introductionmentioning

confidence: 92%

“…There are the following cases in which exine sculpture would be correlated with pollination mechanisms. Extremely reduced exines have been reported in two groups of hypohydrophilous angiosperms with different origins, e.g., in the monocotyledonous species Halodule wrightii and Thalassodendron ciliatum (Cymodoceaceae) and in the dicotyledonous species Ceratophyllum demersum (Ceratophyllaceae) (Pettitt and Jermy 1975;Pettitt 1981;Takahashi 1995). Wodehouse (1935) suggested that the exine has been reduced in thickness during the course of evolution from a terrestrial ancestor to aquatic existence, since a thick exine is not necessary in hypohydrophilous pollination.…”

Section: Introductionmentioning

confidence: 98%

“…In the Hydrocharitaceae, the exine structures of the hypohydrophilous species Halophila decipiens, H. stipulacea, and Thalassia hemprichii (Pettitt and Jermy 1975;Pettitt 1980) and the male flower-epihydrophilous species Enhalus acoroides have been observed in transmission electron microscopy (TEM). Exine sculptures of Egeria , Elodea (Cook and Urmi-Koenig 1985), Hydrilla (Cook 1988), Hydrocharis (Scribailo and Posluszny 1984;Cook and Luond 1982b), Limnobium (Cook and Urmi-Konig 1983), and Ottelia have been examined in scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation between pollen morphology and pollination mechanisms in the Hydrocharitaceae

2004

View full text Add to dashboard Cite

The pollen morphology of 11 genera and 11 species of the Hydrocharitaceae and one species of the Najadaceae was studied using scanning and transmission electron microscopies, and the exine structures and sculptures are discussed in relation to pollination mechanisms and the molecular phylogeny. The pollen grains of the Hydrocharitaceae are spherical, inaperturate, and form monads or tetrads, while those of the Najadaceae are elliptical, inaperturate, and form monads. The entomophilous genera Egeria, Blyxa, Ottelia, Stratiotes, and Hydrocharis share pollen grains that have projections like spines or bacula. The anemophilous genus Limnobium has reticulate pollen grains. The hypohydrophilous genera Thalassia and Najas are characterized by pollen grains with reduced exine structures. The pollen-epihydrophilous genera Elodea and Hydrilla have tightly arranged small spinous pollen grains, and the male flower-epihydrophilous genera Enhalus and Vallisneria have reduced reticulate or gemmate exines. Character state reconstruction of the exine structures and sculptures using a molecular phylogenetic tree suggests that variation in the exine is generally correlated with the pollination mechanism; the selective pressures acting on the pollination mechanisms have reduced the exine structure in hypohydrophilous plants and resulted in various exine sculptures that are adapted to the different pollination mechanisms in entomophilous, anemophilous, and pollen-epihydrophilous plants.

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correlation between pollen morphology and pollination mechanisms in the Hydrocharitaceae

2004

View full text Add to dashboard Cite

show abstract

“…In some other Alismatales with hydrophilous pollination (e.g. Zostera: Zosteraceae; Pettitt & Jermy 1975), the elongated microsporocytes divide successively and filiform pollen develops by rapid elongation of the microspores following release from the tetrads. Pettitt and Jermy (1975) did however report that partitioning was difficult to observe in Zostera since the microsporocytes are arranged obliquely across the loculus.…”

Section: Microsporogenesismentioning

confidence: 99%

“…Zostera: Zosteraceae; Pettitt & Jermy 1975), the elongated microsporocytes divide successively and filiform pollen develops by rapid elongation of the microspores following release from the tetrads. Pettitt and Jermy (1975) did however report that partitioning was difficult to observe in Zostera since the microsporocytes are arranged obliquely across the loculus. Simultaneous division was recorded in Thalassia (Hydrocharitaceae) by Pettitt (1981) and he described the tetrads as isobilateral, linear and T-shaped; however he described the meiocytes as isodiametric cells.…”

Section: Microsporogenesismentioning

confidence: 99%

Microsporogenesis and pollen morphology in dioscoreales and allied taxa

Caddick

Furness

Stobart

et al. 1998

Grana

View full text Add to dashboard Cite

Reproductive ecology and postpollination development in the hydrophilous monocot Ruppia maritima

Taylor

Giffei

Dang

et al. 2020

American J of Botany

View full text Add to dashboard Cite

Premise Water‐pollination (hydrophily) is a rare but important pollination mechanism that has allowed angiosperms to colonize marine and aquatic habitats. Hydrophilous plants face unique reproductive challenges, and many have evolved characteristic pollen traits and pollination strategies that may have downstream consequences for pollen performance. However, little is known about reproductive development in the life history stage between pollination and fertilization (the progamic phase) in hydrophilous plants. The purpose of this study was to characterize reproductive ecology and postpollination development in water‐pollinated Ruppia maritima L. Methods Naturally pollinated inflorescences of R. maritima were collected from the field. Experimental pollinations using both putatively outcross and self pollen were conducted in the greenhouse and inflorescences were collected at appropriate intervals after pollination. Pollen reception, pollen germination, pollen tube growth, and carpel morphology were characterized. Results Ruppia maritima exhibits incomplete protogyny, allowing for delayed selfing. Pollen germinated within 15 min after pollination. The average shortest possible pollen tube pathway was 425 μm and pollen tubes first reached the ovule at 45 min after pollination. The mean adjusted pollen tube growth rate was 551 μm/h. Conclusions Ruppia pollen is adapted for rapid pollen germination, which is likely advantageous in an aquatic habitat. Small effective pollen loads suggest that pollen competition intensity is low. Selection for traits such as a long period of stigma receptivity, fast pollen germination, and carpel morphology likely played a larger role in shaping postpollination reproductive development in Ruppia than evolution in pollen tube growth rates.

show abstract

Pollen in hydrophilous angiosperms

Cited by 27 publications

References 7 publications

Correlation between pollen morphology and pollination mechanisms in the Hydrocharitaceae

Correlation between pollen morphology and pollination mechanisms in the Hydrocharitaceae

Microsporogenesis and pollen morphology in dioscoreales and allied taxa

Reproductive ecology and postpollination development in the hydrophilous monocot Ruppia maritima

Contact Info

Product

Resources

About