S-RNases from Self-incompatible and -compatible Apple Cultivars: Purification, Cloning, Enzymic Properties, and Pollen Tube Growth Inhibitory Activity.

  • KATOH Naoki
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i> Present address: <i>Aomori Flower Center 21</i>
  • GOTO Kazunori
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • ASANO Junpei
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • FUKUSHIMA Kiyoe
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • YAMADA Kenji
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • KASAI Aya
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • LI Tian Zhong
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • TAKANOHA Makoto
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • MIYAIRI Kazuo
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>
  • OKUNO Toshikatsu
    <i>Laboratory of Biochemistry, Faculty of Agriculture and Life Science, Hirosaki University</i>

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  • S-RNases from Self-incompatible and -compatible Apple Cultivals: Purification, Cloning, Enzymic PRoperties, and Pollen Tube Growth Inhibitory Activity

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Abstract

  Four S-RNases (RNase associated with self-incompatibility) were purified from the styles of two apple cultivars (Malus domestica), a self-incompatible cv., Starking Delicious (SD), and a self-compatible cv., Megumi (MG). Each cultivar produced two S-RNases and their enzymatic properties such as specific activity, pH optimum, thermal stability, and molecular mass, were characterized. The four S-RNases inhibited the tube growth of apple pollen in an in vitro bioassay at 25 μg/ml (1.0 μM), but did not distinguish self from non-self pollen. The cDNAs of four S-RNases were cloned, and the nucleotide and deduced amino acid sequences were analyzed. The nucleotide sequence of SD-Se RNase was a new one and the other was identical to that of Sc-RNase of cv. Fuji. In MG one was identical to the sequence of SD-Sc RNase and the other to that of Sa-RNase of cv. Golden Delicious except for one base. From results of the isolation amounts and the Western blot analysis for stylar crude extracts the amount of S-RNases in MG was apparently less than that in SD.<br>

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