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Annals of Botany 20: 553-562, 1956
© 1956 Annals of Botany Company

RESEARCH-ARTICLE

Comparative Physiology of Apple Rootstocks

II. The Effect of pH and Aeration on the Growth of Malling Apple Rootstocks in Water Cultures

I. F. BIRD and H. C. RUCK

Research Institute of Plant Physiology, Imperial College London

Three Malling apple rootstocks, M.IX, M.II, and M.XVI, were grown in aerated and non-aerated nutrient solutions at pH 3·6, 4·0, and 5·5, and their growth and survival compared with rootstocks grown in sand and in soil. No plants survived in the non-aerated cultures due to severe bacterial and fungal attack on the roots. In the aerated series a marked difference in susceptibility of rootstocks to root infection was found, M.XVI being considerably more resistant than M.II or M.IX. More rootstocks survived at the lower pH's (4·0 and 3·6) but among surviving plants of M.XVI growth was much less than at pH 5·5. It would appear therefore that factors making for survival do not of necessity make for optimum growth. In sand and soil cultures all plants survived.


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