Jasmonate-regulated root growth inhibition and root hair elongation

Abstract

The phytohormone jasmonate is an essential endogenous signal to regulate multiple plant processes for environmental adaptations, such as primary root growth inhibition and root hair elongation. Perception of environmental stresses promotes the accumulation of jasmonate which is sensed by the CORONATINE INSENSITIVE1 (COI1)-JASMONATE ZIM-DOMAIN (JAZ) co-receptor, triggering the degradation of JAZ repressors and induction of transcriptional reprogramming. The basic helix-loop-helix (bHLH) subgroup IIIe transcription factors MYC2, MYC3, and MYC4 are the most extensively characterized JAZ-binding factors and together stimulate jasmonate-signaled primary root growth inhibition. Conversely, the bHLH subgroup IIId transcription factors (i.e. bHLH3 and bHLH17) physically associate with JAZ proteins and suppress jasmonate-induced root growth inhibition. For root hair development, JAZ proteins interact with and inhibit ROOT HAIR DEFECTIVE 6 (RHD6) and RHD6 LIKE1 (RSL1) transcription factors to modulate jasmonate-enhanced root hair elongation. Moreover, jasmonate also interacts with other signaling pathways (such as ethylene and auxin) to regulate primary root growth and/or root hair elongation. Here, we review the recent progresses that have provided insights into jasmonate-mediated primary root growth and root hair development.

The Roles of Hormone Signals Involved in Rhizosphere Pressure Response Induce Corm Expansion in Sagittaria trifolia

“…In addition, several types of JAs showed differential accumulation in the arrowhead samples from the two treatment groups. When plants were stressed, JA increased and interacted with other hormones, and inhibiting root elongation was also a typical trait [42]. Therefore, we speculated that JA may be involved in the rhizosphere pressure response in the underground parts, which provides new evidence of JA signals mediating rhizosphere pressure to change rhizosphere characteristics.…”

Jasmonate: A Hormone of Primary Importance for Temperature Stress Response in Plants

“…The term “jasmonates” generally refers to jasmonic acid and its derivatives, typically including jasmonyl isoleucine (JA-Ile) and methyl jasmonate (MeJA) [ 27 ]. In addition to its well-known role in growth and development, and in defense against pathogen attack and insect herbivory [ 28 , 29 , 30 , 31 , 32 ], a growing number of studies have highlighted the vital role of JA in the response to a variety of abiotic stresses, including drought, salinity, heat, and cold stress response [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. In the present review, we present recent findings regarding the role of JA in the response to cold and heat stress, and we elucidate the major components in the JA signaling pathway that are involved in cold and heat stress response.…”

Jasmonate: the Swiss army knife in the plant’s pocket

“…Roots and root hairs are unique organs for anchoring plants in the soil and absorbing water and nutrients, and Han et al (2023) review novel findings in the control of their development by jasmonate. Inhibition of root growth is a hallmark phenotype for screening of jasmonate-related mutants, and studies have shown that MYC2 is a positive regulator for this response ( Lorenzo et al , 2004 ).…”

“…bHLH3 and bHLH17) negatively regulate root growth inhibition through physically interacting with JAZ proteins. Jasmonate also stimulates root-hair development, and ( Han et al (2023) first ­introduce the research background and then highlight the recent finding that JAZ proteins interact with and inhibit the RHD6 and RSL4 transcription factors to control root-hair elongation. Previous reports have shown that two ethylene-activated transcription factors, EIN3 and EIL1, interact with JAZ proteins and participate in the regulation of root-hair growth ( Zhu et al , 2011 ).…”