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Plant and Cell Physiology, 1990, Vol. 31, No. 2 167-172
© 1990

Article

Lack of Functional Interrelationship between ß-amylase Photoregulation and Chloroplast Development in Mustard (Sinapsis alba L.) Cotyledons

V. A. Manga and R. Sharma1

School of Life Sciences, University of Hyderabad Hyderabad-500 134, India

1 To whom correspondence should be addressed.

In the cotyledons of mustard seedlings light mediates an increase in ß-amylase [EC 3.2.1.2 [EC] ] activity via agency of phytochrome. In order to understand the functional significance of above photoresponse, the relationship between light induced ß-amylase increase, chloroplast development and starch content of cotyledon was investigated. The application of SAN 9789 a chlorosis inducing inhibitor to mustard seedlings, though destroyed chloroplast, had no effect on light mediated increase in ß-amylase indicating the lack of functional interrelationship between chloroplast development and ß-amylase increase. The subcellular localization studies revealed that ß-amylase is a cytosolic enzyme. Additionally, the increase in the level of ß-amylase had no relationship with in vivo starch level, which was present only in trace amounts. The noncorrelation of the photoregulated ß-amylase increase with the starch content and its extra-chloroplastic localization indicates that ß-amylase does not participate in the mobilization of plastidic starch in mustard cotyledon.

(Received December 28, 1988; Accepted September 8, 1989)
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