Claim · model-written summary
Four named Ribes species had the largest medium-pollen share, 91.8–94.6%.
Ribes sanguineumVerbatim
e0“The largest share of the medium-sized pollen is found in Ribes sanguineum, R. ussuriense, R. saxatile and R. aureum (91.8–94.6%)”
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 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 germination often showed disturbed growth direction.
- 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.
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Drepanopeziza ribis