Induction of isoflavonoid biosynthesis in Lotus japonicus after UV-B irradiation.

08:00 EDT 23rd March 2019 | BioPortfolio

Summary of "Induction of isoflavonoid biosynthesis in Lotus japonicus after UV-B irradiation."

Enhanced ultraviolet radiation (UV) is an important environmental factor that may cause reductions in the growth and productivity of plants. In the present work we studied the response to UV-B radiation in leaves of the model legume Lotus japonicus. After UV-B treatment, induction of phenyalanine-ammonia lyase gene expression and enzyme activity was detected. Among the ten genes encoding for PAL found in the L. japonicus genome, LjPAL1 was both the most expressed and the most induced. All the genes encoding for enzymes of the isoflavonoid pathway were also strongly induced; this was paralleled by a marked accumulation of vestitol and isoliquiritigenin. Moreover, accumulation of several other isoflavonoids was also detected. In vitro measurements of the free radical scavenging capacity of vestitol indicated that this compound can be an appropriate free radical scavenger, suggesting a possible role for this molecule in the response to abiotic stress. On the other hand, an increase of flavonol levels was not observed while the expression of the key enzymes for flavonol biosynthesis flavanone-3-hydroxylase and flavonol synthase was decreased. Taken together, these results indicate that L. japonicus follows a peculiar strategy in its response to UV radiation by accumulating isoflavonoids as an possible alternative to accumulation of flavonols as observed in other plant species.


Journal Details

This article was published in the following journal.

Name: Journal of plant physiology
ISSN: 1618-1328
Pages: 88-95


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Medical and Biotech [MESH] Definitions

A plant genus of the family NELUMBONACEAE. The common name of lotus is also for LOTUS and NYMPHAEA.

A plant genus of the family NYMPHAEACEAE. The common name of lotus is also used for LOTUS and NELUMBO.

Irradiation of one half or both halves of the body in the treatment of disseminated cancer or widespread metastases. It is used to treat diffuse metastases in one session as opposed to multiple fields over an extended period. The more frequent treatment modalities are upper hemibody irradiation (UHBI) or lower hemibody irradiation (LHBI). Less common is mid-body irradiation (MBI). In the treatment of both halves of the body sequentially, hemibody irradiation permits radiotherapy of the whole body with larger doses of radiation than could be accomplished with WHOLE-BODY IRRADIATION. It is sometimes called "systemic" hemibody irradiation with reference to its use in widespread cancer or metastases. (P. Rubin et al. Cancer, Vol 55, p2210, 1985)

A tribe of the PEA FAMILY. The genus Lotus, a member of this tribe and formerly known as Tetragonolobus, is unrelated to other plants with the common name of lotus (NELUMBO and NYMPHAEA).

A plant genus of the family FABACEAE. This genus was formerly known as Tetragonolobus. The common name of lotus is also used for NYMPHAEA and NELUMBO.

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