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Plant and Cell Physiology, 1997, Vol. 38, No. 10 1111-1117
© 1997

Development of Potato Minitubers in Microgravity

Elizabeth Kordyum1, Valentina Baranenko1, Elena Nedukha1 and Vladimir Samoilov2

1 Institute of Botany, National Academy of Sciences of Ukraine 2 Tereschenkovskaya str., 252004 Kiev, Ukraine
2 Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine 148 Zabolotnogo str., 252143 Kiev, Ukraine

Stem segments of aseptically grown potato {Solatium tuberosum L. cv. Zarevo) were cultivated for 4 weeks under laboratory conditions and were then grown for 8 d on board the "Mir" orbital space station. Timing was such that minitubers initiated and developed during the 8 d on the "Mir". Under space flight and stationary conditions, spherical minitubers were formed with no statistically significant differences in either the frequency of tuber formation or tuber size. These observations are the first to document the formation of vegetative reproductive organs and of well developed amylogenic storage tissue during the microgravity conditions of orbital space flight. In these minitubers, a majority of the starch was stored in parenchyma, with numerous amyloplasts per cell. In space flight tissue, however, grain size of starch was decreased and lamellae within the amyloplasts was locally enlarged. Furthermore, mitochondria of these tissues were characterized by increased matrix density and well developed cristae.

(Received June 17, 1996; Accepted July 9, 1997)
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