Fertility and vigour of apples in relation to chromosome number View Full Text


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Article Info

DATE

1930-05

AUTHORS

M. B. Crane, W. J. C. Lawrence

ABSTRACT

Odd multiple polyploids are relatively infertile, consequently in fruits such asRubus and.Prunus, where seed and fruit development are closely associated, triploid and other odd multiple forms are relatively unproductive. Triploid apples however are productive,e.g. Bramley’s Seedling, a triploid, is probably more widely cultivated in this country than any other apple. In apples a very low proportion of fruit to flowers is sufficient to give a yield. The apple has ten embryos, and often a single seed is sufficient for the development of a fruit, and even this seed may be imperfect. This approaches parthenocarpy and renders fruit production still less dependent on the formation of seeds. Fruitfulness in apples may therefore be maintained in spite of a high degree of generational sterility. Triploidy in apples is another example of the occurrence of sterile forms in species where a substitute has been found (either in nature or in cultivation) for normal seed and fruit production. The substitution in apples is more complex than usual for, while sexual reproduction is now replaced by grafting, the necessity for the stimulus of seed growth in the formation of a fruit is largely evaded. Therefore triploids are able to fruit although incapable as a rule of yielding offspring of any value. The offspring of triploids, whether derived from selling or crossing with diploids, lack vigour, presumably owing to their aneuploid constitution (cf. Darlington and Moffett). Consequently triploid varieties are likely to be of little value in practical breeding as the necessary vigour and fertility would rarely be obtained in the resulting offspring. More... »

PAGES

153-163

Journal

TITLE

Journal of Genetics

ISSUE

2

VOLUME

22

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02983844

DOI

http://dx.doi.org/10.1007/bf02983844

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037256551


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