Modified Gibberellins Retard Growth of Cool‐Season Turfgrasses†
Modified Gibberellins Retard Growth of Cool‐Season Turfgrasses†
复制标题
改性赤霉素延缓冷季型草坪草的生长†
DOI：
10.2135/cropsci1997.0011183x003700060036x
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Wood
中科院分区：
文献类型：
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作者：
R. King;C. Blundell;L. T. Evans;L. Mander;J. Wood
几种抑制枝条伸长的修饰赤霉素已被评估为草坪草生长抑制剂。二氯甲烷 16,17-二氢 GA 5 (DMDGA 5 ) 有效抑制冷季草、羊茅、早熟禾和多年生黑麦草的生长。在三个季节的三个独立田间试验中，草皮生长（每周切割干重）减少高达 70%。这种抑制持续长达 5 周，然后恢复以控制生长速率，并且通常会出现短暂的生长增强。 DMDGA 5 抑制草坪生长的程度与商业草坪草阻滞剂 Trinexapac-eth（商业配方为 Primo，诺华公司，巴塞尔，瑞士）相同。在对在受控环境条件下生长的迷你草坪进行的研究中，在至少 4 周内，每日用水量也减少了 25% 至 30%。在受控条件下生长的两个草地早熟品种（cvs Holt 和 Bronco）的分离植株，长日照时的叶片伸长率比短日照时的伸长率高出三倍多。抗倒酯和 DMDGA 5 都阻断了大部分生长增加，相关衍生物 16,17-二氢 GA 5 也是如此。由于这些化合物抑制赤霉素生物合成，看来长日照下的额外生长是由于赤霉素含量的增加所致。
Several modified gibberellins which inhibit shoot elongation have been assessed as turfgrass growth retardants. Dichloro-methano 16,17-dihydro GA 5 (DMDGA 5 ) effectively inhibited growth of the cool season grasses, Festuca arundinacea Schreb., Poa pratensis L., and Lolium perenne L. Turf growth (weekly cutting dry weight) was reduced by up to 70% in three separate field trials over three seasons. This inhibition lasted up to 5 wk before recovery to control growth rates and, often, there was then a transient enhancement of growth. DMDGA 5 inhibited turf growth to the same extent as did the commercial turfgrass retardant, Trinexapac-ethyl (commercially formulated as Primo, Novartis, Inc., Basel, Switzerland). Daily water use was also 25 to 30% less over at least 4 wk in studies with mini-swards growing in controlled environment conditions. With isolated plants of two cultivars of P. pratensis (cvs Holt and Bronco) grown in controlled conditions leaf elongation rates were more than three-fold greater in long than short daylengths. Both Trinexapac-ethyl and DMDGA 5 blocked most of this growth increase as did a related derivative, 16,17-dihydro GA 5 . Since these compounds inhibit gibberellin biosynthesis it appears that the extra growth in long days arises from an increase in gibberellin content.