Further Study on the Involvement of Cyanide-Resistant Respiration in the Germination of Cocklebur Seeds

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概要

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• The effect of propyl-gallate(PG) and benzohydroxamic acid(BHAM), inhibitors of cyanide-resistant, alternative respiration path (AP), on germination were examined using after-ripened upper and lower cocklebur (Xanthium pennsylvanicum Wallr.) seeds pre-soaked at 23℃ for various periods. Germination was strongly suppressed by PG or BHAM(0.25 or 0.5 mM) which reduced some portion of AP operation. Similarly, the high temperature-induced germination of pre-soaked upper seeds was promoted by the same low concentration range of PG or BHAM, in which PG and BHAM were effective only when applied at the start of high temperature incubation. The inhibition of germination by C_2H_4 at high temperature occurred only when seeds were exposed to C_2H_4 during the earlier period of high temperature incubation, and delayed application tended to promote their germination, although most of germinated seeds did not exhibit the normal germination behaviour of predominant radicle protrusion. If the upper seeds subjected to a short-time pre-soaking, the inhibition of high temperature-induced germination by C_2H_4 was prevented by the low concentration of PG or BHAM, although the germination restored was mostly an abnormal, predominantly contyldonary growth, suggesting that the germination inhibition by C_2H_4 may be involved in some step of axial growth or in the growth of some specific axial zone. The lower concentration of PG or BHAM were promotive to the axial growth even at 33℃. Based on these results, the involvement of AP in cocklebur seed germination is discussed in relation to the differential growth of axial of axial and cotyledonary tissues.

• 日本植物生理学会の論文

著者

• Esashi Y

  Japan Wood Seed Res. Inst. Ichihara Jpn

• Esashi Yohji

  Department Of Biological Science Tohoku University

• Abe Michikazu

  Department Of Biological Science Tohoku University

• Kurota Akiko

  Department of Biological Science, Tohoku University

• Fuwa Noritoshi

  Department of Biological Science, Tohoku University

• Kurota Akiko

  Department Of Biological Science Tohoku University

• Fuwa N

  Department Of Biological Science Tohoku University

• Fuwa Noritoshi

  Department Of Biological Science Tohoku University

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