Abstract
The stability of chromosome number was investigated in cultures of roots from Swainsona galegifolia. Roots from germinated seeds or plants grown in vitro when cultured in liquid medium showed 90% or more cells with the diploid number of 2n=32. The remaining cells showed aneuploidy mostly below 32. The stability of chromosome numbers was not affected by transformation with Agrobacterium rhizogenes although when roots were transformed with A. rhizogenes LBA 9042 the range of chromosome numbers in the few aneuploid cells present was higher than in roots for which strain A4 was used
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