Volume 30 Number 1 Article 24 Pages: 23-24
Year 1976 Month 1
Title: Haploidy and Inbreeding as Tools in Fruit Breeding
Author: R.S. Bringhurst
Citation
Abstract:
Inbreeding has been employed significantly in possibly 3 of about 20 major fruit crops which have been worked with compentently, and only the peach inbreeding efforts have remotely approached achievements in the well known agronomic, vegetable and ornamental species.
There are formidable obstacles such as polyploidy, self-incompatibility, apomixis, extremely long life cycles and severe inbreeding depression which make the conventional inbreeding approach somewhat clumsy and overly expensive.
Furthermore, the Hansche analyses
indicate that most of the important
economic traits are moderately to
highly heritable with relatively large
amounts of additive variance, indicating
that the inbreeding approach encumbered
with the conventional aforementioned
obstacles is questionably
viable from a practical point of view.
The haploidy approach to relative
homozygocity is feasible as a possible
way of utilizing more sophisticated
breeding procedures in fruit crops,
but is hampered by lack of sufficient
haploids and/or simple methods of
generating them plus lack of efficient
procedures for routinely doubling
the chromosome number of haploids.
Considerable effort in solving the
above and other technical problems
is warranted for they may provide the
gateway to future clonar manipulation;
very likely to be the next important advance in plant breeding and directly
useful in clonally propagated
species.
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