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Mol. Cells 2004; 17(1): 117-124

Published online February 29, 2004

© The Korean Society for Molecular and Cellular Biology

Altered Cell Shapes, Hyperplasia, and Secondary Growth in Arabidopsis Caused by Beet Curly Top Geminivirus Infection

Jongbum Park, Hyunsik Hwang, Haekyung Shim, Kyunghoan Im, Chung-Kyoon Auh, Sukchan Lee, Keith R. Davis

Abstract

Arabidopsis Sei-O ecotype was found to be hypersusceptible to the BCTV-Logan strain in that it developed very severe symptoms, including severely deformed inflorescences with the callus-like structure, and accumulated high level of viral DNA. Microscopic studies of the BCTV-induced cell divisions demonstrated that the activation of cell divisions was preceded by the phloem disruption and the callus-like structure seemed to be originated from the cortex nearby disrupted phloem. We have further defined the callus-like structure formed by BCTV infection using molecular and histochemical analyses. Results indicate that BCTV infection causes the phloem disruption, following by cell enlargement and elongation in cortex and even epidermis. Finally, BCTV induced symptomatic secondary growth in cortex by de novo anticlinal and periclinal cell divisions. Expression of cdc2 and saur from BCTV-infected Arabidopsis correlates with symptom development. These results suggest a critical role of auxin in symptom development in the interactions between Arabidopsis and BCTV.

Keywords Arabidopsis; Beet Curly Top Geminivirus; Callus-like Structure; Phleom Disruption; Secondary Growth.

Article

Research Article

Mol. Cells 2004; 17(1): 117-124

Published online February 29, 2004

Copyright © The Korean Society for Molecular and Cellular Biology.

Altered Cell Shapes, Hyperplasia, and Secondary Growth in Arabidopsis Caused by Beet Curly Top Geminivirus Infection

Jongbum Park, Hyunsik Hwang, Haekyung Shim, Kyunghoan Im, Chung-Kyoon Auh, Sukchan Lee, Keith R. Davis

Abstract

Arabidopsis Sei-O ecotype was found to be hypersusceptible to the BCTV-Logan strain in that it developed very severe symptoms, including severely deformed inflorescences with the callus-like structure, and accumulated high level of viral DNA. Microscopic studies of the BCTV-induced cell divisions demonstrated that the activation of cell divisions was preceded by the phloem disruption and the callus-like structure seemed to be originated from the cortex nearby disrupted phloem. We have further defined the callus-like structure formed by BCTV infection using molecular and histochemical analyses. Results indicate that BCTV infection causes the phloem disruption, following by cell enlargement and elongation in cortex and even epidermis. Finally, BCTV induced symptomatic secondary growth in cortex by de novo anticlinal and periclinal cell divisions. Expression of cdc2 and saur from BCTV-infected Arabidopsis correlates with symptom development. These results suggest a critical role of auxin in symptom development in the interactions between Arabidopsis and BCTV.

Keywords: Arabidopsis, Beet Curly Top Geminivirus, Callus-like Structure, Phleom Disruption, Secondary Growth.

Mol. Cells
Jul 31, 2022 Vol.45 No.7, pp. 435~512
COVER PICTURE
Mesenchymal stem cells (MSCs) are multipotent stem cells capable of differentiating into mesodermal lineages like adipogenic, osteogenic, and chondrogenic. Alcian blue-positive extracellular matrix secreted by chondrocytes in the lacuna confirmed the chondrogenic differentiation of MSCs (Bashyal et al., pp. 479-494).

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