Modified Gibberellins Retard Growth of Cool‐Season Turfgrasses†

Autor: R. W. King, Lloyd T. Evans, Cheryl Blundell, L.N. Mander, J.T. Wood
Rok vydání: 1997
Předmět:
Zdroj: Crop Science. 37:1878-1883
ISSN: 1435-0653
0011-183X
DOI: 10.2135/cropsci1997.0011183x003700060036x
Popis: 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.
Databáze: OpenAIRE
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