Influence of Trinexapac‐Ethyl on Diamond Zoysiagrass in a Shade Environment
Influence of Trinexapac‐Ethyl on Diamond Zoysiagrass in a Shade Environment
复制标题
抗倒酯对遮荫环境下钻石结缕草的影响
DOI：
10.2135/cropsci1999.0011183x003900010031x
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. C. Engelke
中科院分区：
文献类型：
--
作者：
Y. Qian;M. C. Engelke
菱形结缕草（Zoysia matrella）稳定。与其他结缕草品种相比，具有优良的耐阴性。然而，当遮荫水平超过80%时，由于茎长过快和碳水化合物耗竭，草皮林分随着时间的推移而下降。两项独立的研究确定了植物生长调节剂trinexapac-ethyl （TE）是否可以改善遮荫条件下钻石结结草的草坪性能。在温室和混合温室中，成熟的草坪分别承受恒定的86%和88%的遮荫。Trinexapac-ethyl处理包括每月0.048 kg a.i. ha -1 （MTE）、每月0.096 kg a.i. ha -1 （BTE）、每月0.192 kg a.i. ha -1 （TTE）和未处理的对照。1997年的温室试验是在1月至8月进行的，而polyhouse试验是在4月至9月进行的。在整个研究过程中，接受MTE和BTE的钻石草坪的草坪质量保持在可接受的水平，而对照组的草坪质量在遮阳后<3个月恶化到不可接受的水平。TTE处理的金刚石草坪质量优于对照，但逊于MTE和BTE处理。与对照区相比，MTE和BTE处理的草坪(i)地上部垂直生长减少76 ~ 73%，剪枝减少77 ~ 75%；（ii）总非结构性碳水化合物含量增加40 ~ 38%；（iii）根质量增加60 ~ 50%，根系活力提高51 ~ 46%；（iv）光合作用提高48 ~ 42%。结果表明，每月或每月重复施用0.048或0.096 kg a.i. ha -1的TE可显著提高钻石结结草的耐阴性。
'Diamond' zoysiagrass [Zoysia matrella (L.) Merr.] has excellent shade tolerance when compared with other zoysiagrass cultivars. However, because of excessive shoot growth and carbohydrate depletion, turf stand declines with time when shade levels exceed 80%. Two separate studies were conducted to determine if the plant growth regulator trinexapac-ethyl (TE), which suppresses shoot growth, could improve turf performance of Diamond zoysiagrass under shade conditions. Well-established turf was subjected to a constant 86 and 88% shade in the greenhouse and polyhouse, respectively. Trinexapac-ethyl treatments included monthly applications at 0.048 kg a.i. ha -1 (MTE), bimonthly applications at 0.096 kg a.i. ha -1 (BTE), trimonthly applications at 0.192 kg a.i. ha -1 (TTE), and the untreated control. Treatments in 1997 were made from January through August for the greenhouse study and from April to September for the polyhouse study. Diamond receiving MTE and BTE maintained acceptable turf quality throughout the study, while turf quality of the control deteriorated to unacceptable levels <3 mo after shading. Diamond treated with TTE maintained better turf quality than that of the control, but was inferior to MTE and BTE treatments. Compared with control plots, turf receiving MTE and BTE had (i) 76 to 73% less shoot vertical growth and 77 to 75% less clippings, (ii) 40 to 38% higher total nonstructural carbohydrate content, (iii) 60 to 50% higher root mass and 51 to 46% higher root viability, and (iv) 48 to 42% higher photosynthesis. Results suggested that monthly or bimonthly repeated application of TE at 0.048 or 0.096 kg a.i. ha -1 greatly enhanced the shade tolerance of Diamond zoysiagrass.