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Published in Crop Sci 13:612-615 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relations Between Alpha-amylase Activity at and Growth of Rice Seedlings1

John F. Williams and Maurice L. Peterson2

A study was made of possible relationships between alpha-amylase activity (referred to as "activity") and rice (Oryza sativa L.) seedling vigor, particularly as to stand establishment from water-sown seeds. Relationships between activity and seedling weight (wt) during germination were noted for different cultivars and under different temperature and oxygen conditions.

The r values for activity x wt for ‘IR-8’ and ‘Italica Livorno’ were highly significant (0.99 and 0.96 respectively) from the 3rd through the llth days of germination. These two cultivars differed widely in seed weight, enzyme activity, and seedling weight increases. The r value among 20 cultivars was 0.60, significant at the 0.05 level. The range in activity units was from 121.2 (for Italica Livorno) to 16.2 (for ‘Colusa’). A comparison activity units at 30 C on rice germinated on moist blotters, under water, and in a N2 atmosphere showed that submergence had little effect on activity but the oxygen-free atmosphere cut AU in half. These same conditions greatly suppressed seedling weights. Low temperatures (18 C) severely reduced AU and weight. It was concluded that alpha-amylase activity was not an important limitation to seedling development of water-sown rice under cold-water conditions.

Key Words: Seedling vigor • Stand establishment • Germination

1 Contribution from the Department of Agronomy and Range Science, University of California, Davis, Calif. Includes a portion of a M.S, thesis by the senior author.

2 Formerly graduate student (now Farm Advisor, Agricultural Extension Service, Yuba City, Calif. 95991), and Professor of Agronomy, University of California, Davis, Calif. 95616.

Received for publication April 5, 1973.




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