Relationships of pollen size, pistil length and pollen tube growth rates in Rhododendron and their influence on hybridization

1990 ◽  
Vol 3 (1) ◽  
Author(s):  
E.G. Williams ◽  
J.L. Rouse
Keyword(s):  
Pollen Tube ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Tube Growth ◽  
Pollen Size ◽  
Pistil Length

scholarly journals Economy, efficiency, and the evolution of pollen tube growth rates

2016 ◽  
Vol 103 (3) ◽  
pp. 471-483 ◽  
Author(s):  
Joseph H. Williams ◽  
Jacob A. Edwards ◽  
Adam J. Ramsey
Keyword(s):  
Pollen Tube ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Tube Growth

scholarly journals Pollen Viability and Vigor in Hybrid Southern Highbush Blueberries (Vaccinium corymbosum L. ×spp.)

HortScience ◽  
1992 ◽  
Vol 27 (5) ◽  
pp. 425-427 ◽  
Author(s):  
Gregory A. Lang ◽  
E. James Parrie
Keyword(s):  
Pollen Tube ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Pollen Viability ◽  
Pollen Tubes ◽  
Vaccinium Corymbosum ◽  
Tube Growth ◽  
Multiple Pollen ◽  
Southern Highbush

Pollen from six southern highbush blueberry cultivars derived from Vaccinium corymbosum L. and one or more other species (V. darrowi Camp, V. ashei Reade, and V. angustifolium Aiton) was incubated on nutrient agar to determine tetrad viability, pollen tube growth rates, and incidence of multiple pollen tube germinations. `Avonblue' pollen had a significantly lower tetrad germination percentage than `Georgiagem', `Flordablue', `Sharpblue', `Gulfcoast', or `O'Neal', all of which had >90% viable tetrads. The in vitro growth rate of `O'Neal' pollen tubes was significantly higher than the growth rates of `Sharpblue' and `Georgiagem pollen tubes. Of those tetrads that were viable, more than two pollen tubes germinated from 83% and 91% of the `Gulfcoast' and `Sharpblue' tetrads, respectively, while only 11% of the `Flordablue' tetrads produced more than two pollen tubes. The total number of pollen tubes germinated per 100 tetrads ranged from 157 (`Flordablue') to 324 (`Sharpblue'), resulting in actual pollen grain viabilities ranging from 39% to 81%. Genetic differences in pollen vigor, as indicated by pollen viability, pollen tube growth rates, and multiple pollen tube germinations, may influence blueberry growers' success in optimizing the beneficial effects of cross-pollination on fruit development.

Pollen Tube Growth Rates in Zea mays: Implications for Genetic Improvement of Crops

Science ◽  
1980 ◽  
Vol 210 (4468) ◽  
pp. 437-438 ◽  
Author(s):  
E. OTTAVIANO ◽  
M. SARI-GORLA ◽  
D. L. MULCAHY
Keyword(s):  
Zea Mays ◽  
Pollen Tube ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Genetic Improvement ◽  
Tube Growth

High temperature limits in vivo pollen tube growth rates by altering diurnal carbohydrate balance in field-grown Gossypium hirsutum pistils

2011 ◽  
Vol 168 (11) ◽  
pp. 1168-1175 ◽  
Author(s):  
John L. Snider ◽  
Derrick M. Oosterhuis ◽  
Dimitra A. Loka ◽  
Eduardo M. Kawakami
Keyword(s):  
High Temperature ◽  
Pollen Tube ◽  
Gossypium Hirsutum ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Tube Growth

Pollen tube growth in tristylous Pontederia cordata (Pontederiaceae)

1986 ◽  
Vol 64 (11) ◽  
pp. 2602-2607 ◽  
Author(s):  
J. M. Anderson ◽  
S. C. H. Barrett
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Pollen Tubes ◽  
Tube Growth ◽  
Pollen Size ◽  
Tube Length ◽  
Pontederia Cordata ◽  
Incompatible Pollen ◽  
Hand Pollination ◽  
Pollen Tube Length

Pollen tube growth rates in legitimate cross- and self-pollinations were compared by controlled hand pollination in two varieties of Pontederia cordata L. (Pontederiaceae). In each pollen–stigma combination pollen germinated readily on stigmas and pollen tubes penetrated stigmatic tissue. Pollen tube length in styles was positively correlated with pollen size. In most pollinations legitimate pollen tubes grew more rapidly in styles than self pollen tubes. This difference was statistically significant in most comparisons. Inhibition of incompatible pollen tubes was either in the style or ovary. It is suggested that the mechanisms of incompatibility may differ among the floral morphs and depend on the particular pollen size involved in pollinations. The observed differences in pollen tube growth of legitimate cross- and self-pollinations in P. cordata suggest that the species is primarily outbreeding.

scholarly journals Apple Pollen Tube Growth Rates Are Regulated by Parentage and Environment

2016 ◽  
Vol 141 (6) ◽  
pp. 548-554 ◽  
Author(s):  
Candace N. DeLong ◽  
Keith S. Yoder ◽  
Leon Combs ◽  
Richard E. Veilleux ◽  
Gregory M. Peck
Keyword(s):  
Growth Rate ◽  
Pollen Tube ◽  
Growth Rates ◽  
Pollen Tube Growth ◽  
Management Strategies ◽  
Pollen Tubes ◽  
Tube Growth ◽  
Load Management ◽  
Crop Load ◽  
Pollen Tube Growth Rate

A greater understanding of apple (Malus ×domestica) pollen tube growth rates can improve crop load management in commercial orchards. Specifically, applications of caustic bloom-thinning chemicals need to occur when enough, but not too many, flowers have been fertilized to achieve crop load densities that balance yields with marketable fruit sizes. In this study, the pollen tube growth rates of five crabapple (Malus sp.) cultivars were measured in the styles of three maternal cultivars at 12, 18, 24, and 30 °C after 24 hours in a growth chamber. Pollen tube growth rates were greatest for ‘Selkirk’ and ‘Thunderchild’ at 12 °C, and greatest for ‘Indian Summer’, ‘Selkirk’, and ‘Thunderchild’ at 24 °C. Pollen tube growth increased with increasing temperatures until 24 °C. There were minimal pollen tube growth rate increases between 24 and 30 °C. Overall, ‘Snowdrift’ had the slowest pollen tube growth rate of the five evaluated crabapple genotypes. At 24 and 30 °C, ‘Indian Summer’ and ‘Thunderchild’ pollen tubes reached the base of the style most frequently, and ‘Snowdrift’ pollen tubes the least frequently. Pollen tube growth rate was also influenced by the maternal cultivar, with Golden Delicious having relatively faster pollen tube growth than Fuji at 24 and 30 °C. Interactions among paternal and maternal genotypes as well as temperature after pollination reveal complex biological and environmental relationships that can be used to develop more precise crop load management strategies for apple orchards.

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