Chemical “pinching” of pot chrysanthemums with 2,3-dihydro-5,6-diphenyl-1,4-oxathiin

Menhenett, Roger

doi:10.1016/0304-4238(78)90073-0

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…1) . First, GA20 (like GA 3 and GA9 ) is very active in promoting internode extension in this chrysanthemum system soon after its application, and second, pretreatment with daminozide, but not dipyridyl, severely limits the response to GA20 as well as to GA 9 . The daminozide-GA3 interaction was such that, at flowering, 1 pg of GA 3 had virtually eliminated the retardant effect on stem length, while 10µg of GA 3 induced extension growth which closely approached the control + 10µg GA3 value .…”

Section: Resultsmentioning

confidence: 99%

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Interactions of daminozide, 2, 2?-dipyridyl, and gibberellins A3, A9 and A20, in stem extension inChrysanthemum morifolium Ramat: an indication that daminozide may not inhibit the responses to GA9 or GA20 by blocking gibberellin hydroxylation

Menhenett¹

1982

Plant Growth Regul

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Interactions between the growth retardant daminozide (a substituted succinamic acid) and a subsequent application (1 or 10µg) of either gibberellin A 3 , A 9 or A . ., on stem extension in Chrysanthemum morifolium cv. Bright Golden Anne, indicated that pre-treatment of plants with daminozide largely prevented the response to GA,, as well as to GA 9 . The daminozide-GA3 interaction on total stem length was dependent upon the dose of GA 3 such that, by flowering time, 1 µg of GA 3 had virtually eliminated the retardant effect, while 10 µg of GA 3 increased stem length to a value similar to that achieved by control shoots receiving 10 µg of GA 3 . In contrast, prior application of 2, 2'dipyridyl (an inhibitor of hydroxylation in some plant and animal systems) had no significant influence on the time courses of response to any of the GAs . In the absence of daminozide (and 2, 2'-dipyridyl) all three GAs were very active in promoting internode extension soon after their application . If 2, 2'-dipyridyl can block hydroxylation reactions in chrysanthemum tissues, the results do not support the hypothesis that daminozide restricts GA 9 -( or GA, a -) induced stem elongation by preventing the hydroxylation of GA9 .

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Section: Resultsmentioning

confidence: 99%

“…Plant material and cultural conditions These have been described before [9,10,11] . In brief, rooted cuttings of C. morifolium cv .…”

Section: Methodsmentioning

confidence: 99%