Journal of Genetics

, Volume 43, Issue 1–2, pp 223–236 | Cite as

Ueber die Verschiedenheit Reziproker Artbastarde in der GattungBegonia

  • Aleksandrs Villerts
Article

Summary

1. Plasma differences in reciprocal crosses between species ofBegonia lead to male sterility and the shedding of the male flowers.

2. The effect is most marked in crosses involving the plasma ofB. Schmidtiana: less so in those with the plasma ofB. manicata andB. heracleifolia.

3. The plasma ofB. Schmidtiana results either in the shedding of male buds at a very early stage (as withB. hirtella andB. subvillosa), at a half opened stage (as withB. acuminata), or else this particular effect is not produced (as withB. semperflorens).

4. The distribution ofB. Schmidtiana genoms inF 1 and back crosses injures theB. semperflorens genom and brings about male sterility.

5. In the back cross (B. Schmidtiana ♀ ×B. hirtella ♂) ♀ ×B. Schmidtiana appears a class of plants in which the male buds are at first shed, but later in the season retained. The ratio of approximate equality between this class and that in which the male buds are shed throughout suggests a single factor for this character. At the same time it is probable that several genes are concerned with male sterility.

6. Apparently the action of the plasma inBegonia does not lie in a general lack of growth stuff but in its unsuitability for the production of normal pollen. Lack of pollen leads to the shedding of the male flowers owing to the failure of the stimulating centres for the circulation of nutriment.

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Copyright information

© Indian Academy of Sciences 1942

Authors and Affiliations

  • Aleksandrs Villerts
    • 1
  1. 1.Botanischer Garten der UniversitätRiga, Lettland

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