HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Sadanaga, K. Search for Related Content PubMed Articles by Sadanaga, K. Agricola Articles by Sadanaga, K.

A Temperature-Sensitive Leaf Necrosis Mutation in Hexaploid Oats¹

An induced mutation in hexaploid oats (Avena sativa L.), characterized by necrosis of the leaf sheaths and blades, is temperature sensitive. In tests in a growth chamber, the mutant phenotype was inhibited at 4 C night and 5.5 C day, but not at 9 C night and 11 C day temperatures. The threshold temperature probably lies between 4 and 9 C. F₂ and F₃ data indicated that penetrance of the dominant allele of the mutant gene In was variable. Segregation of F₃ families fit a ratio of one normal to two segregating to 0.5 necrotic. The deficiency of the homozygous mutant genotype probably resulted from poor germination of In/In F₂ seeds and from weak In/In F₂ plants which produced few or no seeds. Necrosis began as a disorganization of mesophyll cells adjoining the epidermis.

Key Words: Avena sativa L. • Penetrance • X-ray

² Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Ames, Iowa 50010.

Received for publication November 9, 1970.