Abstract：
:The corolla of Brassica rapa has an UV-absorbing zone in its center, known as the nectar guide for attracting pollinating insects. The pigment which plays the role of the nectar guide was isolated from the petals and identified to be isorhamnetin 3,7-O-di-beta-D-glucopyranoside on the basis of MS and NMR spectroscopic data. The D-, L-configurations of the sugar moieties were determined by the fluorometric HPLC method. In plants raised in open field, there was a 13-fold higher content of the compound in the basal parts of the petals compared with the apical parts. This difference in flavonoid content is presumed to contribute to the visual attractiveness of B. rapa flowers to insect pollinators.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Sasaki K,Takahashi Tdoi
10.1016/s0031-9422(02)00237-6subject
Has Abstractpub_date
2002-10-01 00:00:00pages
339-43issue
3eissn
0031-9422issn
1873-3700pii
S0031942202002376journal_volume
61pub_type
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