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INVESTIGATION OF THE STRUCTURE OF REVERTED BLACK CURRANTS
Author(s) -
RIDLER WINIFRED F. F.
Publication year - 1924
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1924.tb05706.x
Subject(s) - biology , petiole (insect anatomy) , botany , horticulture , lenticel , ribes , vascular bundle , hymenoptera
GENERAL CONCLUSIONS AND SUMMARY. No actual qualitative differences in structure have been observed between normal and reverted plants of Ribes nigrum; those that have been observed being rather quantitative, i.e . differences in degree only, e.g . amount of gum present, and variations in the amount of wood and medullary ray tissue. Briefly the main differences showing to a greater or lesser extent practically all through the plant are a reduction in the amount of wood, and a consequent increase of medullary ray tissue, coupled with a tendency to produce more gum in the revert plant than in the normal. On the whole, it is very difficult to correlate the morphological evidences of the disease with any of the anatomical differences observed, as the latter seem quite inadequate to account for the comparatively large morphological effect. The general reduction in the amount of wood present, does not seem sufficient to account for the generally smaller and more unhealthy appearance of the revert bush; nor in the petiole even combined with a certain amount of blocking by gum, can it be held to account entirely for the typical reverted leaf. with fewer veins and reduced leaf surface. In the case of the fruit, although the vascular system is reduced, there seems no reason why some of the ovules at, least should not develop. It is probable that there is some physiological factor at work causing hypertrophy and abortion. My thanks are. due t o Mr A. H. Lees, who has supplied me with all material and given much valuable help and advice. I also thank 31r F. Summers and Professor O.V. Darbishire for their advice and interest in the work.