Plant Meristems: The Interplay of KNOX and Gibberellins
نویسندگان
چکیده
KNOX proteins are required for meristem activity in plants. Recent studies have identified potential targets of KNOX proteins, and in doing so suggested a possible mechanism for the generation of different leaf morphologies.
منابع مشابه
Ectopic expression of KNOTTED1-like homeobox protein induces expression of cytokinin biosynthesis genes in rice.
Some phytohormones such as gibberellins (GAs) and cytokinins (CKs) are potential targets of the KNOTTED1-like homeobox (KNOX) protein. To enhance our understanding of KNOX protein function in plant development, we identified rice (Oryza sativa) genes for adenosine phosphate isopentenyltransferase (IPT), which catalyzes the rate-limiting step of CK biosynthesis. Molecular and biochemical studies...
متن کاملThe maize transcription factor KNOTTED1 directly regulates the gibberellin catabolism gene ga2ox1.
KNOTTED1 (KN1)-like homeobox (KNOX) transcription factors are involved in the establishment and maintenance of plant meristems; however, few direct targets of KNOX proteins have been recognized. Using a combination of double mutant analysis and biochemistry, we found that in maize (Zea mays), KN1 negatively modulates the accumulation of gibberellin (GA) through the control of ga2ox1, which code...
متن کاملThe QTL GNP1 Encodes GA20ox1, Which Increases Grain Number and Yield by Increasing Cytokinin Activity in Rice Panicle Meristems
Cytokinins and gibberellins (GAs) play antagonistic roles in regulating reproductive meristem activity. Cytokinins have positive effects on meristem activity and maintenance. During inflorescence meristem development, cytokinin biosynthesis is activated via a KNOX-mediated pathway. Increased cytokinin activity leads to higher grain number, whereas GAs negatively affect meristem activity. The GA...
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All plant organs are derived from meristems. The shoot apical meristem (SAM) produces the aerial part of the plant. It has two main functions: the maintenance of a group of stem cells at the center of the meristem and the initiation of organs at its periphery. The organs are initiated in a regular spatial pattern, referred to as phyllotaxy, and are separated from the surrounding tissue by a bou...
متن کاملThe Maize Transcription Factor KNOTTED1 Directly Regulates the Gibberellin Catabolism Gene ga2ox1 W OA
KNOTTED1 (KN1)-like homeobox (KNOX) transcription factors are involved in the establishment and maintenance of plant meristems; however, few direct targets of KNOX proteins have been recognized. Using a combination of double mutant analysis and biochemistry, we found that in maize (Zea mays), KN1 negatively modulates the accumulation of gibberellin (GA) through the control of ga2ox1, which code...
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عنوان ژورنال:
- Current Biology
دوره 12 شماره
صفحات -
تاریخ انتشار 2002