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首页> 外文期刊>Journal of Turfgrass Management >Effects of plant growth regulators on tall fescue rooting and water use.
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Effects of plant growth regulators on tall fescue rooting and water use.

机译：植物生长调节剂对高羊茅根系和水分利用的影响。

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The effects of the plant growth regulators mefluidide, paclobutrazol, trinexapac-ethyl (4-(cyclopropyl-alpha-hydroxymethylene)-3,5-dioxo-cyclohexanecarboxylic acid methylester) and ethephon on rooting characteristics, root water extraction from soilwith increasing depth, and evapotranspiration rate in tall fescue (Festuca arundinacea cv. Kentucky 31) were investigated for plants growing in a greenhouse. Ethephon had the most detrimental effect on maximum rooting depth (MRD), root length density (RLD) with increasing profile depth, total root length (TRL: the sum of root length densities at all depths) and root water extraction from soil. Paclobutrazol decreased MRD, TRL and RLD at 2 rooting depths. Trinexapac-ethyl had no effect on MRD, but decreased TRL and RLD at 10-20 cm depth in 1 of 2 experiments. Mefluidide had no effect on MRD or TRL, but decreased RLD at 10-20 cm depth in 1 of 2 experiments. Mefluidide, ethephon and trinexapac-ethyl reduced evapotranspiration rate over a 6 week period; paclobutrazol had no effect. Although ethephon reduced evapotranspiration, it also resulted in the shortest maximum rooting depths and lowest root length densities of all the plant growth regulators tested, increasing vulnerability to water stress. All plant growth regulators reduced shoot elongation rate and clipping weight.
机译：植物生长调节剂美氟肽，多效唑，苯克沙伯-乙基（4-（环丙基-α-羟基亚甲基）-3,5-二氧-环己烷甲酸甲酯）和乙烯利对生根特性，从深度不断增加的土壤中提取根水的影响以及对于温室中生长的植物，研究了高羊茅（Festuca arundinacea cv。Kentucky 31）的蒸散速率。乙烯利对最大生根深度（MRD），根部长度密度（RLD）（随剖面深度增加），总根部长度（TRL：所有深度处的根部长度密度之和）和从土壤中提取根水的危害最大。多效唑可降低2个生根深度的MRD，TRL和RLD。 Trinexapac-ethyl对MRD无影响，但在2个实验中的1个中，在10-20 cm深度处TRL和RLD降低。在2个实验中的1个中，甲氟肽对MRD或TRL无影响，但在10-20 cm深度降低了RLD。甲氟哌啶，乙烯利和抗倒酯在6周内降低了蒸散速率;多效唑没有作用。尽管乙烯利减少了蒸散量，但它也导致了所测试的所有植物生长调节剂的最大生根深度最短且根长密度最低，从而增加了对水分胁迫的脆弱性。所有植物生长调节剂均降低了枝条的伸长率和剪枝重量。

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