Co-Authors:
Villordon, A., LSU AgCenter Sweet Potato Research Station, 130 Sweet Potato Road, Chase, LA 71324, United States
Clark, C., LSU AgCenter Department of Plant Pathology and Crop Physiology, 302 Life Sciences Building, Baton Rouge, LA 70803-2120, United States
la Bonte, D., LSU AgCenter School of Plant, Environmental, and Soil Sciences, 137 J. C. Miller Hall, Baton Rouge, LA 70803-2120, United States
Firon, N., Institute of Plant Sciences, The Volcani Center, Agricultural Research Organization, P. O. Box 6, Bet Dagan, 50250, Israel
Abstract:
This study aimed to investigate the effect of 1-methylcyclopropene (1-MCP) on adventitious rooting in two sweetpotato cultivars. Experiments with 'Beauregard' and 'Evangeline' sweetpotato cuttings revealed differential adventitious root (AR) emergence responsesto1-MCP application. 'Beauregard'AR count and length decreased with 1-MCP application in two of four experiments. In contrast, 1-MCP did not influence 'Evangeline' root count. However, 'Evangeline' root length decreased in three of four experiments. Trypan blue staining of 'Beauregard' nodal tissue with delayed AR primordia emergence showed localized dead tissue in the general area where ARs emerge. The degree of staining appeared to correspond with the stage of AR emergence with the staining becoming more intense around the time an AR primordium eventually emerged through a crack in the epidermis. This response agrees with reported results of ethylene-mediated AR emergence in other plant species. These results also appear to suggest that 'Beauregard' and 'Evangeline' cuttings differ in ethylene sensitivity. This represents the first evidence of genotype-specific ethylene involvement in adventitious rooting of sweetpotato cuttings.
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הדגשת קישורים
חסימת אנימציה
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