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 Rutger, J. N. Articles by Lehman, W. F. Search for Related Content PubMed Articles by Rutger, J. N. Articles by Lehman, W. F. Agricola Articles by Rutger, J. N. Articles by Lehman, W. F.

Induction of Useful Short Stature and Early Maturing Mutants in two Japonica Rice Cultivars¹

Short stature and early maturing mutants were induced in two japonica rice (Oryza sativa L.) cultivars by ⁶⁰Co gamma irradiation. Frequency of useful mutants in the M₂ generation grown from bulked seed of M₁ plants was 1.89% in ‘Calrose’ and only 0.62% in ‘Colusa.’ The most promising mutant was the short stature Calrose selection D7.

D7 was about 25 cm shorter than its parent cultivar Calrose. In 11 large-plot tests conducted over 2 years, D7 equaled the yield of the tall check cultivar ‘CS-M3’ (a cultivar similar to Calrose), was 35 cm shorter and had more lodging resistance. The short stature of D7 was controlled by a single recessive gene.

Two early maturing Calrose mutants, D18 and D31, may be useful as germplasm sources of early maturity. One short stature, early Colusa mutant, D38, may also be useful as germplasm.

Several different short stature phenotypes were induced in Calrose. When Calrose M₁ plants from the 25 kR treatment were handled in a pedigree fashion, nearly 10% of the M₁ plants produced mutants possessing some degree of short stature.

Key Words: Lodging resistance • Mutation breeding • Gamma irradiation • Oryza sativa L.

² Research geneticist, ARS, USDA, Davis, California; professor, Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616; professor, Dep. of Agronomy, National Chung-Hsing Univ., Taichung, Taiwan; and agronomist, Univ. of California, El Centro, CA 92243.

Received for publication January 12, 1976.