Spatio-temporal accumulation and activity of calcium-dependent protein kinases during embryogenesis, seed development, and germination in sandalwood

Anil, Veena S. ; Harmon, Alice C. ; Sankara Rao, K. (2000) Spatio-temporal accumulation and activity of calcium-dependent protein kinases during embryogenesis, seed development, and germination in sandalwood Plant Physiology, 122 (4). pp. 1035-1044. ISSN 0032-0889

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Official URL: http://www.plantphysiol.org/content/122/4/1035.sho...

Related URL: http://dx.doi.org/10.1104/pp.122.4.1035

Abstract

Western-blot analysis and protein kinase assays identified two Ca2+-dependent protein kinases (CDPKs) of 55 to 60 kD in soluble protein extracts of embryogenic cultures of sandalwood (Santalum album L.). However, these sandalwood CDPKs (swCDPKs) were absent in plantlets regenerated from somatic embryos. swCDPKs exhibited differential expression (monitored at the level of the protein) and activity in different developmental stages. Zygotic embryos, seedlings, and endosperm showed high accumulation of swCDPK, but the enzyme was not detected in the soluble proteins of shoots and flowers. swCDPK exhibited a temporal pattern of expression in endosperm, showing high accumulation and activity in mature fruit and germinating stages; the enzyme was localized strongly in the storage bodies of the endosperm cells. The study also reports for the first time to our knowledge a post0translational inhibition/inactivation of swCDPK in zygotic embryos during seed dormancy and early stages of germination. The temporal expression of swCDPK during somatic/zygotic embryogenesis, seed maturation, and germination suggests involvement of the enzyme in these developmental processes.

Item Type:Article
Source:Copyright of this article belongs to American Society of Plant Biologists.
ID Code:54022
Deposited On:11 Aug 2011 12:07
Last Modified:11 Aug 2011 12:07

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