Nitric oxide modulates specific steps of auxin-induced adventitious rooting in sunflower.
Present work on indole-3-acetic acid (IAA)-induced adventitious rooting in sunflower hypocotyl highlights a clear demarcation of nitric oxide (NO)-dependent and NO-independent roles of auxin in this developmental process. Of the three phases of adventitious rooting, induction is strictly auxin-dependent though initiation and extension are regulated by an interaction of IAA with NO. A vital role of auxin-efflux transporters (PIN) is also evident from 1-napthylphthalamic acid (NPA)-triggered suppression of adventitious roots (AR). Use of actin depolymerizing agent, Latrunculin B (Lat B), has demonstrated the necessity of functional actin filaments in auxin-induced AR response, possibly through its effect on actin-mediated recycling of auxin transporter proteins. Thus, evidence for a linkage between IAA, NO and actin during AR formation has been established.
Laboratory of Plant Physiology and Biochemistry, Department of Botany, University of Delhi, Delhi, India.
Sunita
S
Yadav
Anisha
A
David
Satish C
SC
Bhatla
D006368:Helianthus / Q000187:drug effects* / Q000254:growth & development*; D018546:Hypocotyl / Q000187:drug effects / Q000254:growth & development; D007210:Indoleacetic Acids / Q000494:pharmacology*; D008954:Models, Biological; D009569:Nitric Oxide / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects* / Q000254:growth & development*; D014867:Water / Q000494:pharmacology
D007210:Indoleacetic Acids; D014867:Water; D009569:Nitric Oxide