Abstract
To clarify the diversity in funicular internal structures in Leguminosae, 59 legume species (classified into 46 genera, 20 tribes, and 3 subfamilies) were examined by a paraffin-sectioning method. The vascular bundles of legume funicles were clarified as collateral, amphicribral, or amphivasal. In species in which the funicular vascular bundle was collateral throughout the funicle, the xylem is positioned at the pericarpial side in the basal part of the funicle, and the xylem was always positioned at the micropylar side of the phloem in the apical end of the funicles. Whenever the seed direction (from hilum to the micropyle) faces the stylar side, the funicular vascular bundle appears to twist between the basal and the apical part of the funicle. This twist would involve a rotation of the seeds (ovules) during seed (ovule) development. This also may mean that the direction (from hilum to the micropyle) of legume seeds originally faces the pericarp.
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Acknowledgments
The author sincerely thanks to Em. Prof. Hiroyoshi Ohashi of Tohoku University of Japan for his comments on the manuscript and for his help to collect and identify the materials. The author sincerely thanks to Drs. Tomoyuki Nemoto of Ishinomaki Senshu University, Japan, Tadashi Kajita of Chiba University, Japan, Yu Iokawa of Joetsu University of Education, Japan, Byoung-Hee Choi of Inha University, Korea, and Xiang-Yun Zhu of Academia Sinica, Beijing, China, for their help to collect and identify the materials. This work was partially supported by a grant-in-aid for Scientific Research (C) 21570087 from the Japan Society for the Promotion of Science.
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Endo, Y. Anatomical diversity of funicles in Leguminosae. J Plant Res 125, 41–53 (2012). https://doi.org/10.1007/s10265-011-0404-3
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DOI: https://doi.org/10.1007/s10265-011-0404-3