Adaptation of root growth to increased ambient temperature requires auxin and ethylene coordination in Arabidopsis

TY - JOUR

T1 - Adaptation of root growth to increased ambient temperature requires auxin and ethylene coordination in Arabidopsis

AU - Fei, Qionghui

AU - Wei, Shaodong

AU - Zhou, Zhaoyang

AU - Gao, Huanhuan

AU - Li, Xiaofeng

PY - 2017

Y1 - 2017

N2 - Key message: A fresh look at the roles of auxin, ethylene, and polar auxin transport during the plant root growth response to warmer ambient temperature (AT). Abstract: The ambient temperature (AT) affects plant growth and development. Plants can sense changes in the AT, but how this change is transduced into a plant root growth response is still relatively unclear. Here, we found that the Arabidopsis ckrc1-1 mutant is sensitive to higher AT. At 27 °C, the ckrc1-1 root length is significantly shortened and the root gravity defect is enhanced, changes that can be restored with addition of 1-naphthaleneacetic acid, but not indole-3-acetic acid (IAA). AUX1, PIN1, and PIN2 are involved in the ckrc1-1 root gravity response under increased AT. Furthermore, CKRC1-dependent auxin biosynthesis was critical for maintaining PIN1, PIN2, and AUX1 expression at elevated temperatures. Ethylene was also involved in this regulation through the ETR1 pathway. Higher AT can promote CKRC1-dependent auxin biosynthesis by enhancing ETR1-mediated ethylene signaling. Our research suggested that the interaction between auxin and ethylene and that the interaction-mediated polar auxin transport play important roles during the plant root growth response to higher AT.

AB - Key message: A fresh look at the roles of auxin, ethylene, and polar auxin transport during the plant root growth response to warmer ambient temperature (AT). Abstract: The ambient temperature (AT) affects plant growth and development. Plants can sense changes in the AT, but how this change is transduced into a plant root growth response is still relatively unclear. Here, we found that the Arabidopsis ckrc1-1 mutant is sensitive to higher AT. At 27 °C, the ckrc1-1 root length is significantly shortened and the root gravity defect is enhanced, changes that can be restored with addition of 1-naphthaleneacetic acid, but not indole-3-acetic acid (IAA). AUX1, PIN1, and PIN2 are involved in the ckrc1-1 root gravity response under increased AT. Furthermore, CKRC1-dependent auxin biosynthesis was critical for maintaining PIN1, PIN2, and AUX1 expression at elevated temperatures. Ethylene was also involved in this regulation through the ETR1 pathway. Higher AT can promote CKRC1-dependent auxin biosynthesis by enhancing ETR1-mediated ethylene signaling. Our research suggested that the interaction between auxin and ethylene and that the interaction-mediated polar auxin transport play important roles during the plant root growth response to higher AT.

KW - Ambient temperature

KW - Auxin

KW - CKRC1

KW - Ethylene

KW - Polar auxin transport

KW - Root growth

U2 - 10.1007/s00299-017-2171-7

DO - 10.1007/s00299-017-2171-7

M3 - Journal article

C2 - 28660363

AN - SCOPUS:85025143886

SN - 0721-7714

VL - 36

SP - 1507

EP - 1518

JO - Plant Cell Reports

JF - Plant Cell Reports

IS - 9

ER -