| タイトル |
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en
Light-dependent gravitropism and negative phototropism of inflorescence stems in a dominant Aux/IAA mutant of Arabidopsis thaliana, axr2
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| 作成者 |
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| アクセス権 |
open access |
| 権利情報 |
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en
The final publication is available at link.springer.com
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| 主題 |
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Other
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Arabidopsis thaliana
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Other
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Dominant Aux/IAA mutants
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Other
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Gravitropism
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Other
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Hypocotyl
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Other
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Inflorescence
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Other
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Phototropism
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NDC
470
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| 内容注記 |
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Abstract
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Gravitropism and phototropism of the primary inflorescence stems were examined in a dominant Aux/IAA mutant of Arabidopsis, axr2/iaa7, which did not display either tropism in hypocotyls. axr2-1 stems completely lacked gravitropism in the dark but slowly regained it in light condition. Though wild-type stems showed positive phototropism, axr2 stems displayed negative phototropism with essentially the same light fluence-response curve as the wild type (WT). Application of 1-naphthaleneacetic acid-containing lanolin to the stem tips enhanced the positive phototropism of WT, and reduced the negative phototropism of axr2. Decapitation of stems caused a small negative phototropism in WT, but did not affect the negative phototropism of axr2. p-glycoprotein 1 (pgp1) pgp19 double mutants showed no phototropism, while decapitated double mutants exhibited negative phototropism. Expression of auxin-responsive IAA14/SLR, IAA19/MSG2 and SAUR50 genes was reduced in axr2 and pgp1 pgp19 stems relative to that of WT. These suggest that the phototropic response of stem is proportional to the auxin supply from the shoot apex, and that negative phototropism may be a basal response to unilateral blue-light irradiation when the levels of auxin or auxin signaling are reduced to the minimal level in the primary stems. In contrast, all of these treatments reduced or did not affect gravitropism in wild-type or axr2 stems. Tropic responses of the transgenic lines that expressed axr2-1 protein by the endodermis-specific promoter suggest that AXR2-dependent auxin response in the endodermis plays a more crucial role in gravitropism than in phototropism in stems but no significant roles in either tropism in hypocotyls.
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| 出版者 |
en
Springer
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
AM |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/59753
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| 関連 |
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isVersionOf
DOI
https://doi.org/10.1007/s10265-014-0643-1
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PMID
24938853
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| 収録誌情報 |
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PISSN
0918-9440
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EISSN
1618-0860
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en
Journal of Plant Research
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巻127
号5
開始ページ627
終了ページ639
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
