The signal transduction pathways controlling in planta tuberization in potato: an emerging synthesis.
Tuberization is one of the multiple outputs of a single-input phytochrome B sensory system, involving several regulatory genes. Phytochrome B- and GA-mediated photoperiodic perception occurs in the leaf, and then the RNA acts as a systemic signal in the long-distance signaling pathway to initiate tuberization in the subapical region of an underground stolon. There is good evidence that flowering and tuberizing signals might be similar. Is there a cross-talk with an oxidative burst-mediated redox signaling pathway during tuberization? Is the lipoxygenase cascade involved in the formation of the perimedullary tissue in a growing tuber? Do aquaporins regulate cell division, expansion and elongation during stolon growth and tuber induction in potato? Is the adaptive diversity for tuberization under varying photoperiods a micro-evolutionary indicator of differential transduction of cell-to-cell signal molecules under spatial and temporal expression of regulatory genes encoding transcriptional activators? Taking these views into consideration, the review presents an interim synthesis of a signaling network regulating in planta tuberization in potato.
Sarkar
Debabrata
D
Cell and Molecular Biology Laboratory, Division of Crop Improvement, Central Potato Research Institute (CPRI), Shimla, 171001, Himachal Pradesh, India. d.sarkar@excite.com
D008954:Models, Biological; D010834:Phytochrome / Q000235:genetics / Q000378:metabolism; D035281:Plant Tubers / Q000254:growth & development / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*; D011198:Solanum tuberosum / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
D018749:RNA, Plant; D010834:Phytochrome