Claim · model-written summary
Pollen germination often showed disturbed growth direction.
- Outcome
- pollen grains germinate with disturbancese0
RibesNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Often, the pollen grains germinate with disturbances, which is reflected in the direction of their growth”
t0“RIBES”
Title
POLLEN GRAIN STRUCTURE AND POLLINATION IN THE RIBES (GROSSULARIACEAE) REPRESENTATIVES
L. F. Yandovka; I. V. Barabanov БОТАНИЧЕСКИЙ ЖУРНАЛ 2023. doi:10.31857/s000681362301009x
Other claims from this paper (19)
- Observation Ribes pollen was spherical or elliptical with concave sides and porate-colpate structure.
- Observation Currant pollen varied widely between and within species.
- Observation All studied Ribes species had pollen morphology deviations whose pollen did not germinate on artificial medium.
- Observation Five named Ribes species had the most deformed pollen, at 12.7–6.7%.
- Observation Medium pollen of 21–49 μm was most suitable for fertilization.
- Observation Four named Ribes species had the largest medium-pollen share, 91.8–94.6%.
- Observation Morphologically fertile stained pollen comprised 80.3–96.4%.
- Observation Pollen viability on artificial medium was relatively low.
- Observation Five Ribes species germinated better than others at 45–29%.
- Observation Pollen in some Ribes species germinated inside the anther.
- Observation Within-anther pollen germination was greatest in central-zone flowers.
- Observation Apis, Bombus and Chrysopa oculata pollinated Ribes in St. Petersburg.
- Observation Pollinator activity peaked at 10–11 a.m. and 5–6 p.m.
- Observation Ribes pollen germinated actively on the stigma.
- Observation At relatively high air temperature, pollen tubes reached ovules in 3–5 days.
- Observation First-day ovules had mature embryo sacs ready for fertilization.
- Observation Ovary walls bore four hemi-orthotropic ovules at 6–10 levels.
- Observation Pollen entered the stigma with two cells and the generative cell divided into two spermia in the tube.
- Recommendation The authors recommend R. sanguineum, R. spicatum, R. nigrum and R. aureum for breeding in St. Petersburg.