Articles by Futa Yamaji in JoVE
Gli esperimenti sul campo di Ecologia: il caso di Futa Yamaji1, Takeshi A. Ohsawa1 1Department of Biology, Chiba University Per rivelare l'efficacia impollinatore di una data specie di piante, sono stati sviluppati diversi metodi di esperimenti sul campo. Questo studio dimostra i metodi di base di esperimenti sul campo per l'ecologia l'impollinazione utilizzando il caso di studio di Lycoris sanguinea var. Sanguinea e il meccanismo di impollinazione romanzo, rompendo con auricolari impollinazione.
Other articles by Futa Yamaji on PubMed
Breaking-bud Pollination: a New Pollination Process in Partially Opened Flowers by Small Bees Journal of Plant Research. Sep, 2015 | Pubmed ID: 26175010 Plant-pollinator interactions have usually been researched in flowers that have fully opened. However, some pollinators can visit flowers before full opening and contribute to fruit and seed sets. In this paper, we researched the pollination biology of flowers just starting to open in four field experiments. We observed the insect visitors to Lycoris sanguinea var. sanguinea for 3 years at five sites. These observations revealed that only small bees, Lasioglossum japonicum, often entered through tiny spaces between the tepals of 'breaking buds' (i.e. partially opened flowers) and collected pollen. We hypothesized that they can pollinate this species at the breaking-bud stage, when the stigma is located near the anthers. To measure the pollination effect of small bees at the breaking-bud stage, we bagged several breaking buds after small bees had visited them and examined whether these buds were pollinated. In bagging experiments, 30% of the breaking buds set fruit and seeds. Fruit-set ratios of the breaking buds did not differ significantly from those of the fully opened flowers, which had been visited by several insect species. We also counted the pollen grain numbers on the body of L. japonicum and on the anthers of randomly-selected and manipulated flowers. These experiments revealed that all of the captured bees had some pollen of target plants and that L. japonicum collected most of the pollen grains at the breaking-bud stage. Our results showed that the new pollination process, breaking-bud pollination, happened in breaking buds by L. japonicum, although there is no evidence to reveal that this is the most effective pollination method for L. sanguinea var. sanguinea. In principle, this new pollination process can occur in other flowering plants and our results are a major contribution to studies of plant-pollinator interactions.