著者

樋口 正視 岡田 稔 MASAMI HIGUCHI MINORU OKADA ツムラ中央研究所 ツムラ中央研究所 Tsumura Central Research Laboratories Tsumura Central Research Laboratories

雑誌

生薬學雜誌 = Natural medicines (ISSN:13403443)

巻号頁・発行日

vol.50, no.2, pp.170-175, 1996-04-20

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The relationship between the developmental stages of spadix and the developments of pollen grains and the embryo sacs of Pinellia ternata BREIT. was morphologically studied. When the limb of the spathe began to loosen, about 24% of the embryo sac in the female flower were in matured stage, with the anthers in the same spadix still remained in dehiscens. When the anthers began to dehisce and the pollen grains were shedding, most of the embryo sacs in the female flowers were in matured state. When self- or cross-pollinations with other female flowers were performed while the anthers were still undehisce, all spadixs formed fruits. The rate of fructification and the number of fruits in fructificated spadix obtained by these early stage pollinations was definitely higher than those obtained in isolated culture field by the open pollination system. Over 90% of the fruit thus obtained by the early stage pollinations were germinated. Some morphological characters of the progeny obtained by cross-pollination segrigated. The protogyny, or the senility of the female flower when the pollen grains start shedding, may be a cause of rare fruit formation of the plant in nature.