Characterization of Adventitious Root Development in Sweetpotato
| Autor: | Nurit Firon, Amnon Schwartz, Don R. La Bonte, Arthur Villordon, Yanir Kfir, Etan Pressman |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | HortScience. 44:651-655 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.44.3.651 |
| Popis: | Additional index words. storage root development, storage root anatomy, Ipomoea batatas Abstract. Adventitious roots of 'Beauregard' and 'Georgia Jet' sweetpotato were observed and anatomically characterized over a period of 60 days of storage root development. The majority of 'Beauregard' and 'Georgia Jet' adventitious roots sampled at 5 to 7 days after transplanting (DAT) possessed anatomical features (five or more protoxylem elements) associated with storage root development. The majority of 'Beauregard'(86%)and'GeorgiaJet'(89%)storagerootssampledat60to65DATwere traced directly to adventitious roots extant at 5 to 7 DAT. The two varieties, however, differed in the timing in which regular and anomalous cambia were formed. Regular vascular cambium development, i.e., initiation and completion, was observed in both varieties at 19 to 21 DAT. Formation of complete regular vascular cambium was negligible for 'Beauregard' (4%) in comparison with 'Georgia Jet' (32%) at 26 to 28 DAT. However, anomalous cambia development adjacent to xylem elements was greater in 'Beauregard' (30%) in comparison with 'Georgia Jet' (13%). Nearly 40% to 50% of samples in both varieties showed extensive lignification in the stele region. At 32 to 35 DAT, 62% to 70% of the adventitious roots for both varieties had either been initiated (developed anomalous cambium) or were lignified. The remaining adventitious roots showed intermediate stages of vascular cambium development. The adventitious root count increased up to 19 to 21 DAT and then remained constant up to 32 to 35 DAT. These accumulatedresults suggestthatthe initialstages ofadventitiousrootdevelopment are critical in determining storage root set in sweetpotato. |
| Databáze: | OpenAIRE |
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