Sanjay Kapoor

Friday Seminar by Dr. Poonam Mehra


AKT Lab/ Friday/ October 4, 2019/3.30 pm/ Local water cues modulate auxin signaling to instruct developmental decisions
Category: Research
Posted by: bedineel

 

 

Local water cues modulate auxin signaling to instruct root developmental decisions

 

 

Plants rely on their root architecture to efficiently absorb water and nutrients from soil. Roots often exhibit developmental plasticity and adapt their shape to the spatial availability of soil resources. Branching is a major root-shape trait that governs root foraging capacity. Earlier studies have focussed on the impact of excess or limited water availability (i.e. flooding or drought) on root branching. Very recently, it has been discovered that root branching can be regulated by soil moisture at much finer spatial scales than previously realised. It was observed that roots position their new branches in response to local availability of soil moisture. For instance, roots growing along a ‘soil-water and air interface’ favours lateral root initiation towards moist soil. This phenomenon is termed as hydropatterning and is regulated by differential post-translational modification of the transcription factor, ARF7 with SUMO (small ubiquitin-like modifier). SUMOylation blocks ARF7 activity on dry side of the root, thereby suppressing expression of its downstream target and key LR regulatory gene, LBD16. This pioneering study recently revealed important role of SUMOylation in regulating water-related root adaptive traits.

 

Suggested readings

Orosa-Puente B, Leftley N, von Wangenheim D, Banda J, Srivastava AK, Hill K, Truskina J, Bhosale R, Morris E, Srivastava M, Kümpers B, Goh T, Fukaki H, Vermeer JEM, Vernoux T, Dinneny JR, French AP, Bishopp A, Sadanandom A, Bennett MJ (2018) Root branching toward water involves posttranslational modification of transcription factor ARF7. Science 362:1407-1410.

 

Giehl RF, von Wirén N (2018) Hydropatterning-how roots test the waters. Science. 362:1358-1359.