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Research Summary:
We are studying how the stimuli of light and gravity alter patterns of plant development. In our studies of light-induced responses we have found that certain apyrases (NTPDases), whose expression is strongly regulated by the photoreceptor phytochrome, can modulate the levels of extracellular ATP [eATP], and that, surprisingly, changes in [eATP] can influence hormone transport, the growth of plant cells and organs (including pollen tubes, root hairs, hypocotyls, roots and leaves), wound responses, and toxin resistance in Arabidopsis and other plants. This indicates that eATP, which is a physiological regulator in animals, also influences plant growth and development. For our gravitational studies we are using two model systems, Arabidopsis and spores of the fern Ceratopteris richardii. In these plants, we study how gravity-induced gradients of eATP help mediate gravity-induced growth patterns, such as root and shoot gravitropism in Arabidopsis and polarized growth in Ceratopteri spores. In both plants, the activity of apyrases plays a major role in regulating the [eATP] and cellular growth. Specific apyrases function both in the nucleus, where they impact nucleotide concentrations and gene expression, and in the wall, where they hydrolyze ATP, and thus help control the [eATP]. We are using genetic and biochemical approaches to document the signaling steps whereby apyrases and eATP regulate cell growth. Because this regulation includes promoting an expanded root system architecture and increased seed yield in crop plants, our current focus is elucidating the molecular mechanisms by which apyrases control these events.
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Papers共 266 篇Author StatisticsCo-AuthorSimilar Experts
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PLANT PHYSIOLOGYno. 3 (2024): 1323-1335
Physiology and Molecular Biology of Plantsno. 12 (2023): 1875-1879
Ashley E Cannon,Tanya Sabharwal,Mari L Salmi, Ganesh Kumar Chittari,Valli Annamalai, Lindsey Leggett, Hope Morris,Cameron Slife,Greg Clark,Stanley J Roux
Frontiers in plant science (2023): 1150199
bioRxiv (Cold Spring Harbor Laboratory) (2023)
Frontiers in plant science (2023): 1265458
Gayani Weeraratne,Huan Wang, Tharindu P Weeraratne,Tanya Sabharwal,Han-Wei Jiang,Araceli Cantero,Greg Clark,Stanley J Roux
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCESno. 6 (2021): 3283
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