Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)




Chlorophyll deficient mutants have been useful in studying the actions of genes determining the submicroscopic structure of the chloroplast and in analyzing the genetic control of the formation of macromolecular cell structures. Normal chlorophyll development is probably controlled by a large number of genetic factors, most of which are inherited as recessives when mutated. Each of the chlorophyll deficiency phenotypic groups seems to be determined by many genes. The chlorophyll mutations were produced. They could be divided into nine different types (Gustafsson, 1940), according to their appearance at certain stages of development of the plants: albino, xantha, albovridis (alboxantha, xanthalba, virdidoalbina, albovirdis), tigrina, viridis, striata, maculata, undefined mutations, and plasmic mutations. Linkage studies on the usually sublethal chlorophyll mutations are in most cases based on progeny tests of F2 families. The purpose of this experiment is to study the linkage relationships in a material of chlorophyll mutations in barley. For the progeny tests at South Dakota State University, 2336 F2 plants, obtained from Sweden, were selected. The results obtained include some of the crosses made by Holm 91966b) and verify corresponding cross-over values and localization. A number of new combinations were analyzed which confirm certain localizations in chromosomes 1 and 2. (see more in text)

Library of Congress Subject Headings

Barley -- Breeding
Variation (Biology)
Barley -- Genetics




South Dakota State University