This book describes a detailed study of the genetic incompatibility
as represented by the DL system in Physiolus vulgaris. The DL
system is an excellent representative of the genetic
incompatibility between parents of the same species. Specific
hybrids between parents of Phaseolus vulgaris from different
origins exhibit reduced root growth plus shoot abnormalities in F1
plants and failed root growth in a certain proportion of F2 plants.
The phenomenon is attributed to two semi-dominant alleles at two
complementary loci, DL1 and DL2, which are expressed in the roots
and the shoots respectively. The study showed physiological and
anatomical evidences that the inhibitory action of the causative
signal from the DL2 shoot that affects the DL1 root is alleviated
by external supply of sugars. The sugar effect is suggested to be
of a metabolic nature may be via supplying carbohydrates that are
required for the growth as well as generating a signal that can
antagonise the inhibitory effect to some extent. The inhibitory
signal was extracted from the cotyledons of DL2 shoots and its
effect was shown on the DL1 roots, which is thought to be through
the phloem.
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