Ph.D. Entrance - Selected Candidates 2021

Friday Seminar by Dr. Priyanka Agarwal

SR Lab/ Friday/ September 22,2017/ 3.30 pm/ Insights into the regulation of stomatal density and its pattern
Category: Research
Posted by: bedineel

Insights into the regulation of stomatal density and its pattern

Priyanka Agarwal

Stomata are composed of a pair of guard cells and a pore in between them. Stomata act as valves that promote gas exchange between the atmosphere and plant body. The majority of water loss from plants occurs via transpiration through stomata. Plants sense environmental cues in mature leaves and adjust stomatal density in newly forming leaves without hampering the yield. Cysteine-rich secretory peptides belong to EPIDERMAL PATTERNING FACTOR LIKE (EPFL) family function during stomatal development. EPF1 and EPF2 negatively regulate stomatal development at different steps. EPF1 regulates the direction of spacing division that generates satellite meristemoids while EPF2 regulates differentiation of the protodermal cell to the meristemoid mother cell. In contrast to the above factors, STOMAGEN/EPFL9 has been identified as positive signaling factor. Internal tissues regulate stomatal development in epidermis through STOMAGEN. The positive peptide, STOMAGEN, and negative peptides, EPFs, act antagonistically on the same receptors i.e. TOO MANY MOUTHS (TMM) and the ERECTA family (ERf) of receptor like kinases during stomatal development.  So, the recruitment of a unique set of signaling molecules and receptors reflect the innovation by plants to orient asymmetric cell divisions and coordinate pattern formation of stomata. This information can further be used to reduce stomatal density by using genetic manipulation.