Abstract:
:For several years, researchers working on the plant pathogen Botrytis cinerea and a number of other related fungi have routinely used the pLOB1 vector system, based on hygromycin resistance, under the control of the Aspergillus nidulans oliC promoter and what was reported to be the beta-tubulin (tubA) terminator. Recently, it has been demonstrated that this vector contains a 446-bp portion of the B. cinerea argininosuccinate synthase gene (bcass1) rather than the tubA terminator. As argininosuccinate synthase is essential for the production of L-arginine, inadvertent gene silencing of bcass1 may result in partial L-arginine auxotrophy and, indeed, may lead to altered phenotypes in planta. In this article, we report our findings relating to possible problems arising from this incorrect plasmid construction. As an absolute baseline, gene disruption of bcass1 was carried out and generated a strict auxotroph, unable to grow without exogenous arginine supplementation. The knockout displayed an alteration in host range in planta, showing a reduction in pathogenicity on strawberries, French bean leaves and tomatoes, but maintained wild-type growth on grape, which is in accordance with the reported arginine availability in such tissues. Deliberate gene silencing of bcass1 mirrored these effects, with strongly silenced lines showing reduced virulence. The degree of silencing as seen by partial auxotrophy was correlated with an observed reduction in virulence. We also showed that inadvertent silencing of bcass1 is possible when using the pLOB1 vector or derivatives thereof. Partial arginine auxotrophy and concomitant reductions in virulence were triggered in approximately 6% of transformants obtained when expressing enhanced green fluorescent protein, luciferase, monomeric red fluorescent protein or beta-glucuronidase using the pLOB1-based expression system, which inadvertently contains 446 bp of the bcass1 coding sequence. We recommend the testing of transformants obtained using this vector system for arginine auxotrophy in order to provide assurance that any observed effects on the development or virulence are a result of the desired genetic alteration rather than accidental bcass1 silencing.
journal_name
Mol Plant Patholjournal_title
Molecular plant pathologyauthors
Patel RM,Van Kan JA,Bailey AM,Foster GDdoi
10.1111/j.1364-3703.2010.00632.xsubject
Has Abstractpub_date
2010-09-01 00:00:00pages
613-24issue
5eissn
1464-6722issn
1364-3703pii
MPP632journal_volume
11pub_type
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2020-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2005-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:2018-02-09 00:00:00
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pub_type: 杂志文章
doi:10.1111/mpp.12468
更新日期:2017-10-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2018-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2020-12-29 00:00:00
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pub_type: 杂志文章
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更新日期:2001-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2018-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2017-01-01 00:00:00