Publications by authors named "Iris Tal"
The plant hormone gibberellin (GA) regulates multiple developmental processes. It accumulates in the root elongating endodermis, but how it moves into this cell file and the significance of this accumulation are unclear. Here we identify three NITRATE TRANSPORTER1/PEPTIDE TRANSPORTER (NPF) transporters required for GA and abscisic acid (ABA) translocation.
View Article and Find Full Text PDFGibberellins (GAs) are ubiquitous plant hormones that coordinate central developmental and adaptive growth processes in plants. Accurate movement of GAs throughout the plant from their sources to their destination sites is emerging to be a highly regulated and directed process. We report on the development of novel photocaged gibberellins that, in combination with a genetically encoded GA-response marker, provide a unique platform to study GA movement at high-resolution, in real time and in living, intact plants.
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- Transport of signaling molecules is crucial for plant growth, with auxin being a key example that is regulated by transporters affecting development.
- Researchers tackled the challenge of identifying redundancies in transporter functions by creating a transportome multi-targeted forward-genetic screen using artificial-microRNAs (amiRNAs).
- They developed a library of 3000 plant lines with 1777 amiRNAs, identifying 80 lines with notable shoot growth differences, and discovered important redundant roles for the previously unexamined genes ABCB6 and ABCB20 in auxin transport.
As sessile organisms, plants must respond to the environment by adjusting their growth and development. Most of the plant body is formed post-embryonically by continuous activity of apical and lateral meristems. The development of lateral adventitious roots is a complex process, and therefore the development of methods that can visualize, non-invasively, the plant microstructure and organ initiation that occur during growth and development is of paramount importance.
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- The Aux/IAA proteins are important repressors in plants that influence various growth and developmental processes, with 29 unique genes identified in Arabidopsis.
- Limited genetic studies have hindered our understanding of individual Aux/IAA gene functions and their regulatory mechanisms.
- Research found that transcription factors (especially from the DREB/CBF family) promote certain Aux/IAA genes under stress, linking the auxin signaling network with plant responses to abiotic stress.
The potato tuber is a swollen underground stem that can sprout under dark conditions. Sprouting initiates in the tuber apical bud (AP), while lateral buds (LTs) are repressed by apical dominance (AD). Under conditions of lost AD, removal of tuber LTs showed that they partially inhibit AP growth only at the AD stage.
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- Gibberellins (GAs) are crucial plant hormones involved in various developmental processes, but their transport and distribution mechanisms are still not well understood.
- Using fluorescently labeled GAs (GA-Fl), the study identified the NPF3 transporter in Arabidopsis, which is responsible for the efficient transport of GA across cell membranes.
- NPF3 is regulated by GA itself, expressed in root endodermis, and also facilitates the transport of abscisic acid (ABA), indicating a possible interaction between GA and ABA during the transport process.