Effect of Cycocel 750 SL on Germination and Initial Development of Some Sorghum Species

Irena A. Golubinova1*, Bogdan N. Nikolov2, Slaveya Т. Petrova2,3, Iliana G. Velcheva2, Ekaterina G. Valcheva3, Plamen A. Marinov-Serafimov1
1 - Instute of Forage Crops, Scientific Department of Breeding and Seed Production of Forage Crops, 89 Gen. Vladimir Vazov Street. 89, Pleven, 5800, BULGARIA
2 - Plovdiv University "Paisii Hilendarski", Faculty of Biology, Department of Ecology and
Environmental Conservation, 24 Tzar Asen Street, Plovdiv, 4000, BULGARIA
3 - Agricultural University, Faculty of Agroecology and Plant Protection, Department of Agroecology and Environmental Protection, 2 Mendeleev Blvd., Plovdiv, 4000, BULGARIA
*Corresponding author: golubinova@abv.bg
Abstract.  During the period 2018-2019, a laboratory test was carried out to determine the effect of Cycocel 750 SL (750 g/l chlormequat chloride) on germination and initial development of selected samples of Sorghum species: Sorghum bicolor L., Sorghum sudanense (Piper.) Stapf. and Sorghum vulgare var. technicum Körn. Cycocel 750 SL is usually applied as plant growth regulator with retardant activity on wheat (Triticum sp.) but some authors have observed a stimulatory effect on germination and root elongation of many crops when it was applied for pre-sowing treatment of seeds. We found, that the combined application of Cycocel 750 SL (as pre-sowing treatment and foliar application) in concentrations 0.75-3.8% w/v leads to the enhanced germination of seeds as well as to the significant decrease of shoot-to-root ratio (expressed by the Coefficient of allometry, CA) in all experimental variants in comparison with the control one. Shoot development was significantly inhibited in all cases while the root growth was depressed only at lower concentration applied (0.75% w/v) and stimulated by higher doses of Cycocel (1.5-3.8% w/v). Seedling vigor index (SVI) revealed 24-48% higher values after the Cycocel 750 SL application on S. vulgare var. technicum (2.6% w/v), S. bicolor (2.6% w/v) and S. sudanense (3.0% w/v).
Key words: hormo-priming, germination rate, plant growth regulators, crops.

Ecologia Balkanica, 2020, Volume 12, Issue 1 pp. 11-19
Article № eb.19150 [Full text - PDF]pdf

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