Bud Sprouting and Growth of Cyperus Rotundus L. Altered by Cytokinins

Date
1973
Authors
Teo, Christopher Kheng Hoe
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Varying concentrations of N-6-benzyl adenine (BA), indoleacetic acid (lAA), gibberellic acid (GA), abscisic acid (ABA), and 2-chloroethylphosphonic acid (ethephon) were used to induce sprouting of dormant nutsedge (Cyperus rotundus L.) tubers, BA at 50 to 300 ppm stimulated sprouting. The continuous presence of BA during the sprouting period was necessary to give significant sprout stimulation. Kinetin and 6-benzylamino-9-(tetrahydropyran- 2-yl) 9H-purine (PBA) showed similar stimulatory effects on sprouting. Neither lAA at 1, 10, or 100 ppm; GA at 10, 100, or 1000 ppm; nor ethephon at 10, 100, or 1000 ppm had stimulatory effects on sprouting. ABA reversed the stimulatory effects of BA when tubers were treated with ABA following BA treatment. Sprouting was markedly greater at 33 0 day, 25 C night than at 2k C day, 1? C night. There was no difference between cytokinin-induced sprouting in single tubers and that of tubers in intact rhizome chains. Enhanced sprouting was the same in light or darkness. Soilapplied cytokinin resulted in sprout stimulation similar to that observed in petri dishes and in sand culture. Growth of plants originating from tubers pretreated with 100 ppm BA did not differ significantly from the controls. Sustained foliar applications of BA at 100 and 200 ppm produced numerous plants with tuft-type growth habit, delayed flowering, and reduced the number of inflorescences. Numerous short, diageotropic rhizomes were produced. The acidic ether extract from purple nutsedge tubers showed the presence of inhibitory substances in the acidic ether fraction. These inhibitors were generally referred to as inhibitory. Inhibitor y6* inhibited sprouting of excised purple nutsedge buds as well as elongation of wheat coleoptile. The inhibition of bud sprouting by inhibitory was relieved by BA. Application of ABA also inhibited sprouting of the excised buds and this was similarly reversed by BA applications. Inhibitor^ mainly consisted of phenols and possibly ABA as a minor component. The suggested role of BA in enhancing sprouting of purple nutsedge tubers was to antagonize inhibitor actions. The feasibility of the use of cytokinin-like substance to precondition purple nutsedge for subsequent eradication was discussed.
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