| root hydraulic conductivity and whole-plant water balance in tropical saplings following a shade-to-sun transfer. | we hypothesized that pioneer and late successional species show different morphological and physiological responses in water use after gap formation. the magnitude of the responses was compared between two pioneer species (macaranga gigantea and trema orientalis) and four late successional species (shorea sp.), in an experiment in which saplings were transferred from shade to sun. although transpiration demand increased following the transfer, root hydraulic conductivity (lp(r)) decreased. lp(r) ... | 2004 | 15619094 |
| ontogenetic transition of leaf physiology and anatomy from seedlings to mature trees of a rain forest pioneer tree, macaranga gigantea. | in a field study, we compared anatomy and diurnal gas exchange and chlorophyll fluorescence in sunlit mature leaves of macaranga gigantea (reichb. f. and zoll.) muell. seedlings, saplings, an adult tree and suckers originating from stumps. we tested the hypothesis that the pattern of resource use shifts across various life stages with ontogenetic changes in leaf anatomy and physiology. among leaves of different developmental stages, seedling leaves were the smallest and thinnest, whereas adult t ... | 2005 | 15741149 |
| macagigantin, a farnesylated flavonol from macaranga gigantea. | a new farnesylated flavonol derivative, macagigantin (1), together with two known flavonoids, glyasperin a (2) and apigenin (3), had been isolated from the acetone extract of the leaves of macaranga gigantea. the structure of the new compound was elucidated as 6-farnesylkaempferol based on its spectroscopic data, including uv, ir, 1d and 2d nmr, and hr-ei-ms spectra. compounds 1-3 were evaluated for their cytotoxic properties against p-388 cells, their ic(50) values being 11.3, 6.0, and 5.1 micr ... | 2009 | 20183255 |