抗倒酯对遮荫下狗牙根生长和草坪质量的影响

Effects of Trinexapac-Ethyl on Growth and Turf Quality of Baoding Bermudagrass Under Shade

以河北农业大学选育的‘保定狗牙根’为试验材料,在50%遮荫胁迫下,采用3种浓度抗倒酯60、120、240μL·m-2对盆栽草坪进行喷施处理,探讨抗倒酯对遮荫胁迫下‘保定狗牙根’生长及草坪质量的影响。结果表明:施用6周后,喷施抗倒酯处理的狗牙根植株高度较对照显著降低了49.7%~55.0%,叶片长度和节间长度分别较对照缩短了52.2%~57.9%和43.0%~49.5%,叶片宽度和茎粗分别较对照增加了60.1%~76.6%和37.6%~68.8%,且均以高浓度处理效果最明显;试验期间,抗倒酯处理的狗牙根草坪外观质量综合评分较对照提高了10.2%~25.3%,叶片可溶性糖含量有所增加,但叶片PSⅡ最大光化学效率(Fv/Fm)无明显变化。表明喷施抗倒酯有助于改善‘保定狗牙根’草坪在遮荫胁迫下的表现。

Taking‘Baoding bermudagrass’selected by Hebei Agricultural University as the plant material,the experiment was conducted to determine the influence of trinexapac-ethyl(TE)on the growth and turf quality of bermudagrass under 50%shade.Trinexapac-ethyl was applied at 60μL·m-2,120μL·m-2 and 240μL·m-2 by spraying on separate containers.The results showed TE had significant effects on plant height,leaf and internode length,leaf width,stem diameter and turf visual quality of‘Baoding bermudagrass’under shade.After 6 weeks,the height,leaf length and internode length of TE-treated plants reduced by 49.7%to 55.0%,52.2%to 57.9%and 43.0%to 49.5%compared with non-TE-treated plants respectively,but leaf width and stem diameter significantly increased by 60.1%to 76.6%and 37.6%to 68.8%respectively with increasing TE rate.Trinexapac-ethyl enhanced turf visual quality by 10.2%-25.3%and increased the soluble sugar content to some extent during the study,but had no significant influence on Fv/Fm of leaves.The results suggested that TE was conducive to improve the shade performance of‘Baoding bermudagrass’.