Harmony but Not Uniformity: Role of Strigolactone in Plants

These findings suggested that additional components rather than Pleiotropic Drug Resistance 1 may be involved in SLs transport in Arabidopsis

Naveed Ur Rehman; Xi Li; Peichun Zeng; Shaoying Guo; Saad Jan; Yunfeng Liu; Yifeng Huang; Qingjun Xie

2021

Scholarcy highlights

  • Published: 1 November 2021Plant hormones, known as phytohormones, are chemicals produced in very low concentrations to regulate the growth of almost all plant species
  • This newly defined phytohormone was discovered by the research of the parasitic plant Striga lutea in the 1960s; the witchweed used the SLs as a signal to initiate germination from the roots of host plants for survival due to the lack of photosynthetic capabilities
  • In Arabidopsis, mycorrhization is absent due to the absence of a transporter protein compared to the production and signaling components. These findings suggested that additional components rather than Pleiotropic Drug Resistance 1 may be involved in SLs transport in Arabidopsis
  • The repression of a key enzyme in the production of bioactive Gibberellic Acid, gibberellin 3-oxidase2, was significantly decreased at 32 ◦ C compared to the levels at the optimal temperature, and treatment with GR24 suppressed the transcript abundance of 9-cis-epoxycarotenoid dioxygenase9, one of the key enzymes for abscisic acid biosynthesis in seeds, similar to those seen at 24 ◦ C
  • Lateral root development, and adventitious rooting are all thought to be regulated by SLs; because of the interaction with other phytohormones, the nature of these actions differs across species and growth conditions
  • Striga species infest maize, rice, sorghum, and millet crops across Africa, lowering maize yields up to 80% in heavily infested fields and generating significant loss and food insecurity
  • Stress may have an impact on SL biosynthesis, signaling, and crosstalk with other plant hormones
  • With respect to SL biosynthesis, several hints have recently been reported but the bioactive form of SLs that regulates various aspects of plant growth and development is still uncertain

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