TY - JOUR

T1 - Cross-regulation of Arabidopsis root growth by plant hormones auxins and ethylene

AU - Korobova, Alla

AU - Vasinskaya, Anna

AU - Kirpichnikova, Anastasia

AU - Shishova, Maria

AU - Kudoyarova, Guzel

PY - 2018

Y1 - 2018

N2 - We investigated the cross-talk between auxin (IAA) and ethylene in the control of root growth of Arabidopsis plants (Arabidopsis thaliana). The root growth of ethylene insensitive etr1-1 and auxin insensitive tir1 mutants under the effect of IAA and 1-methylcyclopropene (1-MCP, inhibitor of ethylene perception) was compared, respectively, with that of the wild type ecotype Columbia (Col-0). Roots of Col-0 were shorter than those of the etr1-1 mutant. The addition of IAA (5.7 × 10 –6 М) to the growth medium led to 20 % root shortening in Col-0 plants, but not in etr1-1 mutants. Thus, the capacity of plants for ethylene perception contributes to the control of root length and its sensitivity to IAA. Roots of etr1-1 were less heavy than in Col-0, indicating that ethylene maintains root mass accumulation. Treatment with IAA caused a decrease in root mass of both genotypes (resulting in a 25 and 10 % decline in the root mass of Col-0 and etr1-1 as compared to the corresponding control), suggesting that IAA may influence root biomass accumulation independently of ethylene. However, sensitivity to ethylene increases plant responsiveness to IAA. Mutation in the auxin receptor decreased the sensitivity of roots to inactivation of ethylene receptors: treatment with 1-MCP resulted in a 40 % decline in the root mass of Col-0 and only a 10 % decrease in tir1. The decrement in sensitivity to auxins in the tir1 mutant decreased the responsiveness of root biomass to 1-MCP-treatment. These data suggest an additive action of ethylene and auxins on accumulation of root biomass.

AB - We investigated the cross-talk between auxin (IAA) and ethylene in the control of root growth of Arabidopsis plants (Arabidopsis thaliana). The root growth of ethylene insensitive etr1-1 and auxin insensitive tir1 mutants under the effect of IAA and 1-methylcyclopropene (1-MCP, inhibitor of ethylene perception) was compared, respectively, with that of the wild type ecotype Columbia (Col-0). Roots of Col-0 were shorter than those of the etr1-1 mutant. The addition of IAA (5.7 × 10 –6 М) to the growth medium led to 20 % root shortening in Col-0 plants, but not in etr1-1 mutants. Thus, the capacity of plants for ethylene perception contributes to the control of root length and its sensitivity to IAA. Roots of etr1-1 were less heavy than in Col-0, indicating that ethylene maintains root mass accumulation. Treatment with IAA caused a decrease in root mass of both genotypes (resulting in a 25 and 10 % decline in the root mass of Col-0 and etr1-1 as compared to the corresponding control), suggesting that IAA may influence root biomass accumulation independently of ethylene. However, sensitivity to ethylene increases plant responsiveness to IAA. Mutation in the auxin receptor decreased the sensitivity of roots to inactivation of ethylene receptors: treatment with 1-MCP resulted in a 40 % decline in the root mass of Col-0 and only a 10 % decrease in tir1. The decrement in sensitivity to auxins in the tir1 mutant decreased the responsiveness of root biomass to 1-MCP-treatment. These data suggest an additive action of ethylene and auxins on accumulation of root biomass.

KW - 1-MCP

KW - Arabidopsis thaliana

KW - Ethylene

KW - Etr1-1

KW - IAA

KW - Root growth

KW - Tir1

UR - http://www.scopus.com/inward/record.url?scp=85064651859&partnerID=8YFLogxK

U2 - 10.21638/spbu03.2018.404

DO - 10.21638/spbu03.2018.404

M3 - Article

AN - SCOPUS:85064651859

VL - 63

SP - 256

EP - 260

JO - Biological Communications

JF - Biological Communications

SN - 2542-2154

IS - 4

ER -