The results of a three-year study the self-fertility 15 varieties highbush blueberry and one variety lowbush are presented. fruiting indicators (berry setting, average berry weight, number seeds per berry) in case most self-pollinating varieties, as rule, lower than with natural cross-pollination. In accordance fruit set during self-pollination flowers, ranked into five groups corresponding to ...

For rare plants, self-pollination and inbreeding can increase in small populations, while unusual levels of outcrossing can occur through restoration efforts. To study both inbreeding and outcrossing, we performed experimental pollinations using Panax quinquefolius (American ginseng), a wild-harvested plant with a mixed mating system. For inbreeding, plants were either cross-pollinated within t...

Within a population of F hybrids between two genotypes ( L. Group Phureja DM 1-3 516 R44 [DM] and L. Group Tuberosum RH89-039-16 [RH]) used in the potato genome sequencing project, we observed fruit set after self-pollination on many plants. Examination of pollen tube growth in self-fertile and self-unfruitful F plants after controlled self-pollinations revealed no difference in the ability of ...

The role of pollinators in the evolution of the African-Malagasy orchid genus Brownleea (Brownleeinae) was investigated. Taxa show specialization for pollination by bees (B. parviflora, B. recurvata), short-proboscid flies (B. galpinii), and long-proboscid flies (B. macroceras, B. coerulea). All species in the genus produce nectar, but some (B. coerulea, B. galpinii) appear to mimic flowers of ...

Mature, self-incompatible stigmas exposed to cycloheximide for 2 h prior to pollination supported identical germination and growth of both cross and self pollen. Treatment of self-pollinated pistils with cycloheximide resulted in the germination of hitherto inactive pollen after some 2-4 h. Pollen germination and initial tube growth in an in vitro germination medium were not significantly affec...

François Jacob once facetiously lamented the arrangement in the human body whereby reproduction is the only function for which an individual is equipped with only one-half of the necessary organs, thus entailing the expenditure of a substantial amount of time and energy into finding the other half (10). The spatial separation of the sexual partners (or organs) is indeed an obligatory feature of...

Pollination services are critical in entomophilous crops. Relationships between pollinator visits and fruit set mass complex optimal strategies to improve pollination poorly defined. We often do not understand what proportions of the crop result from self- or cross-pollination, how cross-pollination affects quality far cross-pollen is transported. quantified cross-paternity nuts partially self-...

BACKGROUND AND AIMS Vigna caracalla has the most complex flower among asymmetrical Papilionoideae. The objective of this study was to understand the relationships among floral characteristics, specialization, mating system and the role of floral visitors under different ecological contexts. METHODS Five populations were studied in north-western Argentina, from 700 to 1570 m a.s.l. Anthesis, c...

BACKGROUND AND AIMS The genus Melocactus comprises 36 species of globose cacti with the most derived traits in the Cereeae tribe. It is the proper study system to examine what are the most derived reproductive strategies within that tribe. This study aims to characterize the reproductive biology and to estimate the mating system parameters of two Andean melocacti, Melocactus schatzlii and M. an...