SWEETs, MAX4, BRC1, and CLE44 genes are crucial players in the definition of Arabidopsis stem architecture impacting seed yield

RAMINGER, B LORENA; CHAN RAQUEL L.; CABELLO JULIETA V.

Rosario

Congreso; XXXIV Argentinian Meeting of Plant Physiology RAFV Conference 2023; 2023

The size and number of vascular bundles have an impact on final seed production in Arabidopsis and sunflower (Cabello & Chan, 2019). Multiple phytohormones and complex molecular pathways are involved in the development and maintenance of the vascular pattern. In this work, we study the impact of brassinosteroids and strigolactones on the generation of secondary vascular tissue mediated by mechanical treatment and the participation in this response of genes that regulate branching, activate the proliferation of the vascular cambium and mediate the loading and unloading to the phloem. Furthermore, we evaluated the implications of this treatment on characteristics directly related to yield such as the expression of enzymes that regulate photoassimilate accumulation pathways, the arrival of these from source to sink tissues, and the speed of transport through the phloem.Elucidate which hormonal and molecular pathways participate in the development of the response to mechanical treatment and how this impacts the plant architecture and its ability to mobilize photosynthates.Evaluate whether these effects are reproducible in other crops that generate fruits or seeds