PROHEXADIONE-CALCIUM, A GIBBERELLIN BIOSYNTHESIS INHIBITOR, CAN REDUCE VEGETATIVE GROWTH IN 'BING' SWEET CHERRY TREES

2005 ◽  
pp. 447-452 ◽  
Author(s):  
D. Manríquez ◽  
B. Defilippi ◽  
J. Retamales
Keyword(s):  
Vegetative Growth ◽  
Sweet Cherry ◽  
Gibberellin Biosynthesis ◽  
Biosynthesis Inhibitor ◽  
Prohexadione Calcium ◽  
Cherry Trees

scholarly journals Direct and apparent residual effects of prohexadione - calcium applied to young cropping sweet cherry trees

2012 ◽  
Vol 63 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Tadeusz Jacyna ◽  
Tomasz Lipa
Keyword(s):  
Sweet Cherry ◽  
Fruit Shape ◽  
Residual Effects ◽  
Tree Trunk ◽  
Flower Bud ◽  
Internode Growth ◽  
Carry Over ◽  
Prohexadione Calcium ◽  
Fruit Diameter ◽  
Cherry Trees

The same young cropping 'Regina' sweet cherry trees were foliar treated with prohexadione-calcium (Pro- Ca) in two consecutive years at a concentration of [ 125, 125 x 2, 250 ]-(A) and [ 250, 375, 500 ]-(B) mg ProCa l<sup>-1</sup>, respectively. The following year some trees from A-treatments were left untreated to observe carry-over effects (C). None of A-treatments influenced tree trunk, shoot extension and internode growth, whereas B-treatments reduced shoot extension and internode length, simultaneously increasing flower bud density, particularly by 500 mg ProCa l<sup>-1</sup>. There were no carry-over effects produced by C-trees, except some retardation in shoot extension. None of the treatments influenced the tree cropping level. Fruit diameter was reduced by A-treatments, but fruit shape (L/D ratio) and mass were reduced by treatments B, and such reduction was also exhibited by C-trees (residual effects).

scholarly journals Controlling Floral Initiation and Vegetative Growth of Apple with Prohexadione Calcium (BAS-125W), an Experimental GA-biosynthesis Inhibitor

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 557E-558 ◽  
Author(s):  
Christopher L. Owens ◽  
Eddie W. Stover
Keyword(s):  
Vegetative Growth ◽  
Shoot Growth ◽  
Tree Size ◽  
Floral Initiation ◽  
Biosynthesis Inhibitor ◽  
Nursery Stock ◽  
Bud Set ◽  
Terminal Bud ◽  
Prohexadione Calcium ◽  
Ga Biosynthesis

Early fruit production and control of tree size are important factors in the economic viability of high-density apple orchards. A horticultural tool permitting growers to induce terminal budset should provide greater control over the balance between vegetative growth and reproduction, increasing orchard production and profitability. With this goal, the experimental GA-biosynthesis inhibitor, BAS-125W, is being evaluated for effects on enhancing floral initiation and controlling tree size in young orchards. In nursery stock, the effect of inducing earlier terminal budset is also being studied for influence on storage carbohydrates and performance after planting. Studies in 1996 showed that 250 ppm BAS-125W induced terminal bud set on actively growing second-leaf `Macoun', `Delicious', and `Fuji' trees. Seven application dates from 17 June to 9 Sept. were compared to determine how time of treatment would effect degree and distribution of flowering the following year. Terminal budset typically occurred 2 weeks after application, with shoot growth resuming in 4 to 5 weeks. At two dates, treatment of growing tips only was compared with entire tree application to distinguish the direct effect of GA-inhibition on floral initiation from the effect of redistributing photosynthate. Treatment from 17 June to 29 July significantly reduced total annual shoot growth compared to the untreated controls, while later treatments had no significant effect on shoot length. Treatments of nursery stock with BAS-125W on 1 Sept. accelerated terminal bud set by at least 7 days compared to untreated controls of both `Fuji' and `Golden Delicious'. Effects of treatments on flowering and tree growth in 1997 will be discussed.

Leaf removal and prohexadione-calcium can modify Camarosa strawberry nursery plant morphology for plasticulture fruit production

2005 ◽  
Vol 85 (3) ◽  
pp. 665-670 ◽  
Author(s):  
J. Y. Reekie ◽  
P. R. Hicklenton ◽  
J. R. Duval ◽  
C. K. Duval ◽  
P. C. Struik
Keyword(s):  
Active Ingredient ◽  
Plant Morphology ◽  
Fruit Production ◽  
Gibberellin Biosynthesis ◽  
Fragaria Ananassa ◽  
Biosynthesis Inhibitor ◽  
Nursery Practices ◽  
Nursery Plant ◽  
Bare Root ◽  
Prohexadione Calcium

Mowing and the application of a new gibberellin biosynthesis inhibitor, prohexadione-calcium (ProCa), were studied as methods to modify the bare-root transplant morphology of Camarosa strawberry (Fragaria × ananassa Duchesne) in a Nova Scotia nursery. The effect these nursery practices had on fruit production in annual hill plasticulture was also determined. In one experiment Camarosa plants were sprayed with ProCa at an active ingredient concentration of 62.5 mg L-1 on Aug. 22, Sep. 05, or Sep. 19, 2001 and 2002, corresponding, respectively, to growing degree days (10°C base) of 800, 894 and 965 in 2001 and 726, 821 and 908 in 2002. Application on Aug. 22 increased production of daughter plants, especially those of marketable size, by increasing the number of daughters per meter of runner and allocating more dry matter to marketable daughters. In a second experiment, field plots were mowed and/or treated with ProCa at an active ingredient concent ration of 62.5 mg L-1 on Sep. 05 or Sep. 19, 2001 and 2002. All plants were dug in early October, shipped to Dover, Florida, and transplanted into plasticulture for fruit production. At digging, plants that had been mowed or treated with ProCa on Sep. 05 were reduced in plant height and total leaf area compared with untreated plants. Plants that were treated both with ProCa and mowed were the shortest. Fruit yield was higher from treated than from untreated plants. In 2001, the treatments increased early fruit production. Key words: Fragaria × ananassa, mowing, gibberellin biosynthesis inhibitor, phenology, height control

scholarly journals Influence of Regulated Deficit Irrigation and Environmental Conditions on Reproductive Response of Sweet Cherry Trees

Plants ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 94 ◽  
Author(s):  
Victor Blanco ◽  
Pedro José Blaya-Ros ◽  
Roque Torres-Sánchez ◽  
Rafael Domingo
Keyword(s):  
Leaf Area ◽  
Vegetative Growth ◽  
Deficit Irrigation ◽  
Sweet Cherry ◽  
Fruit Set ◽  
Irrigation Treatment ◽  
Regulated Deficit Irrigation ◽  
Reproductive Response ◽  
Floral Differentiation ◽  
Cherry Trees

The reproductive response of fifteen year old sweet cherry trees (Prunus avium L.) combination ‘Prime Giant’/SL64 under Mediterranean climate to deficit irrigation was studied in a commercial orchard in south-eastern Spain for four seasons. Three irrigation treatments were assayed: (i) control treatment, irrigated without restrictions at 110% of seasonal crop evapotranspiration; (ii) sustained deficit irrigation treatment, irrigated at 85% ETc during pre-harvest and post-harvest periods, and at 100% ETc during floral differentiation, and (iii) regulated deficit irrigation treatment, irrigated at 100% ETc during pre-harvest and floral differentiation and at 55% ETc during post-harvest. The duration and intensity of the phenological phases of sweet cherry trees, including cold accumulation, flowering, fruit set or fruit and vegetative growth, were assessed to ascertain whether the different irrigation strategies imposed affect the trees’ reproductive response (fruit yield, fruit size, leaf area, fruit physiological disturbances, and starch and soluble carbohydrates stock) in the same season or have a negative effect in the next season. Deficit irrigation did not advance, enhance or penalize flowering, fruit set or fruit growth. Neither did it diminish carbohydrate concentration in roots or cause an increase in the number of double fruits, which was more linked to high temperatures after harvest. However, deficit irrigation decreased vegetative growth and consequently the leaf area/fruit ratio, which, when it fell below 180 cm2 fruit−1, affected cherry size.

scholarly journals Vegetative Growth Responses of Citrus Nursery Trees to Various Growth Retardants

2010 ◽  
Vol 20 (1) ◽  
pp. 197-201 ◽  
Author(s):  
Smit le Roux ◽  
Graham H. Barry
Keyword(s):  
Vegetative Growth ◽  
Foliar Application ◽  
Shoot Length ◽  
Internode Length ◽  
Citrus Limon ◽  
Gibberellin Biosynthesis ◽  
Growth Responses ◽  
Biosynthesis Inhibitors ◽  
Nursery Trees ◽  
Prohexadione Calcium

As part of a larger study to improve rind color of citrus (Citrus spp.) fruit, this initial study was conducted to determine the concentration of various gibberellin-biosynthesis inhibitors required to elicit a biological response in citrus trees, as measured by vegetative growth. Paclobutrazol and GA3 were included as control treatments at concentrations known to elicit growth-retarding or growth-promoting effects, respectively. Repeated (×4) foliar applications of GA3 (at 64 ppm) increased growth of ‘Eureka’ lemon (Citrus limon) shoots by 63%, with no significant effect on rootstock and scion diameters. Repeated foliar applications of prohexadione-calcium (ProCa) at various concentrations (100, 200, 400, or 800 ppm) as well as uniconazole (at 500 or 1000 ppm) and paclobutrazol (at 0.25%) had no effect on rootstock or scion diameters 8 months after the first application. The high concentrations of ProCa (800 ppm) and uniconazole (1000 ppm), and the paclobutrazol treatment (0.25%) reduced shoot length compared with the control. Uniconazole at 1000 ppm resulted in the most growth retardation, which resulted in 34% shorter shoot length than the control. Although the number of nodes on the longest shoot did not differ from the untreated control, internode length differed significantly among treatments. ProCa at 400 and 800 ppm, uniconazole at 1000 ppm, and paclobutrazol at 0.25% significantly reduced internode length relative to the control by 31%, 56%, 50%, and 28%, respectively. Vegetative growth of ‘Eureka’ lemon nursery trees was retarded following the repeated (×4) foliar application of gibberellin-biosynthesis inhibitors. ProCa at 400 to 800 ppm and uniconazole at 1000 ppm were identified as prospective treatments for further field studies to test their effects on rind color enhancement of citrus fruit.

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