丁二醇对热胁迫下匍匐翦股颖内源激素及其相关基因表达水平的调控

This research investigated ways to improve the heat resistance of creeping bentgrass（Agrostis stolonifera）in the context of use as a turfgrass in a global warming environment. Potted seedlings of the variety Penn A4 were studied under a simulated high temperature environment （37 ℃/32 ℃ ，day/night） and subjected to treatments involving foliar spraying of 300 μmol ∙ L^-1 2，3-butanediol（BD） to examine effects on leaf endogenous hormone content and the related gene expression. Seedlings received a BD pretreatment before being exposed to heat stress for 0，7 or 42 days before BD pretreatment，and then were allowed to recover at optimal temperature for 10 days. For seedlings subject to 7 days of heat stress it was found that BD application increased the levels of cytokinin，gibberellins （GA₃） and jasmonic acid， decreased levels of auxin， salicylic acid， abscisic acid， and 1-aminocyclopropane carboxylic acid，and decreased the expression of related genes，thereby accelerating transpiration-driven cooling and plant vegetative growth. In addition，in plants subject to 42 days of stress，BD pre-treatment up-regulated the expression levels of various hormone-related genes，and reduced leaf hormone content by promoting endogenous hormone transport，thus inhibiting plant vegetative growth，and an energy saving whereby Penn A4 seedlings were able to resist long-term heat stress，and improving their survival probability. In summary，by regulating endogenous hormone metabolism to accelerate the growth rate and transpiration-induced cooling of Penn A4 under short-term stress，and by inhibiting the senescence and growth rate of plants under long-term stress，BD improved heat tolerance of Penn A4 creeping bentgrass. © 2022 Editorial Office of Acta Prataculturae Sinica. All rights reserved.

Regulatory effects of butanediol on the expression level of endogenous hormones and related genes in creeping bentgrass under heat stress

This research investigated ways to improve the heat resistance of creeping bentgrass （Agrostis stolonifera） in the context of use as a turfgrass in a global warming environment. Potted seedlings of the variety Penn A4 were studied under a simulated high temperature environment （37 ℃/32 ℃， day/night） and subjected to treatments involving foliar spraying of 300 μmol?L^-1 2，3-butanediol （BD） to examine effects on leaf endogenous hormone content and the related gene expression. Seedlings received a BD pretreatment before being exposed to heat stress for 0， 7 or 42 days before BD pretreatment， and then were allowed to recover at optimal temperature for 10 days. For seedlings subject to 7 days of heat stress it was found that BD application increased the levels of cytokinin， gibberellins （GA₃） and jasmonic acid， decreased levels of auxin， salicylic acid， abscisic acid， and 1-aminocyclopropane carboxylic acid， and decreased the expression of related genes， thereby accelerating transpiration-driven cooling and plant vegetative growth. In addition， in plants subject to 42 days of stress， BD pre-treatment up-regulated the expression levels of various hormone-related genes， and reduced leaf hormone content by promoting endogenous hormone transport， thus inhibiting plant vegetative growth， and an energy saving whereby Penn A4 seedlings were able to resist long-term heat stress， and improving their survival probability. In summary， by regulating endogenous hormone metabolism to accelerate the growth rate and transpiration-induced cooling of Penn A4 under short-term stress， and by inhibiting the senescence and growth rate of plants under long-term stress， BD improved heat tolerance of Penn A4 creeping bentgrass.