Watermelon is one of the most important fruit crops in world, but their flowers require bees for pollination. In this study we determine bee species visiting watermelon flowers, daily visits and resource they forage during 84 observation days on Los Santos, Panama. Native bees, especially stingless represented visits, so probably play a very role pollination within zone. The frequent were N. pe...

Our research focused on the reproductive phenology of Mauritiella armata, a key veredas species in southeastern Brazil, and aspects its floral fruit morphology sexual system. We observed phenological patterns M. armata for 36 months, examined relationships between phenophases environmental variables to describe relation filters, as well morphologies, system (to evaluate dioecy), biometry parts....

Over three consecutive years in central Mississippi, sweetgum (Liquidambar styraci/lua L.) and sycamore (Platanus occidentalis L.) fruits had nearly reached fullsize by late June. Sweetgum seeds were physiologically mature by mid-August, but dry weight increased until late September. As sweetgum seeds matured, the crude fat level rose to 27 percent of seed dry weight. During maturation, concent...

Although "dry-type" stigmas are widely regarded as ancestral in angiosperms, the early-divergent family Annonaceae has copious stigmatic exudate. We evaluate three putative functions for this exudate: as a nutritive reward for pollinators; as a pollen germination medium; and as an extragynoecial compitum that enables pollen tube growth between carpels. Stigmatic exudate is fructose dominated (7...

HIGHLIGHTSIn an abortive ovary of hazel, an integument seldom differentiated and a mature embryo sac never developed.In an abortive ovary of hazel, pollen tube growth was arrested at the style base about 40 days after blooming. Thus, fertilization of the ovule was precluded.Ovary abortion in the four hybrid cultivars was indicated to be associated with insufficient resource availability to supp...

We investigated the basis for fruit drop in walnut (Juglans regia L.) following bloom period applications of streptomycin as a potential control treatment for walnut blight, a bacterial disease incited by Xanthomonas campestris pv. juglandis (Pierce) Dye. Experiments were conducted on streptomycin-treated field plots of ‘Vina’ walnut. Four streptomycin treatments were applied at different times...

The new species Cissampelos arenicola M. Nee & R. Ortiz, from the Bolivian and Paraguayan Chaco is described, its affinities are discussed, and its preliminary conservation status is evaluated. The species is at present known from 13 collections from sand dunes or dry forests. Cissampelos arenicola is distinguished from all other American species in the genus by its ovate- to subreniform-trilob...

Premise Floral rewards are essential in understanding floral function and evolution of the relationships between flowers pollinators. Whether sugars present stigmatic exudates Anthurium whether it has nectaries have remained controversial because scarcity structural studies. To solve these questions, we investigated anatomy A. andraeanum to elucidate (1) tepals secretory organs, (2) possess a s...

Cannabis is a mostly dioecious multi-use flowering plant genus. Sexual dimorphism an important characteristic in Cannabis-based commercial production systems, which has consequences for fibre, seed, and the yield of secondary metabolites, such as phytocannabinoid terpenes therapeutic uses. Beyond obvious morphological differences between male female plants, metabolic variation among flowers lar...