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held in storage, and then replanted into a new location. Not surprisingly, the loss of a large proportion of biomass usually results in major physiological changes within the tree until an adequate root system is rebuilt. Meanwhile, poor root

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A late-storage root-forming mutant (`KM95-A68') of sweetpotato [Ipomoea batatas (L.) Poir.] was characterized to clarify the genetic and physiological mechanisms of storage root formation. This mutant originated from a somaclonal mutation of `Kokei No. 14'. Storage roots of `KM95-A68' are rare and, when formed, develop 2 or 3 weeks later than those of `Kokei No. 14' from which it originated. Morphological characteristics of the canopy and leaf photosynthetic rates of `KM95-A68' were similar to those of `Kokei No. 14'. No apparent differences were observed in the anatomy of root cross sections of `KM95-A68' and `Kokei No. 14'. An apparent increase in the root zeatin riboside (ZR) levels were observed in `Kokei No. 14' at storage root formation. Root ZR levels differed between `Kokei No. 14' and `KM95-A68'. The onset of increase in root ZR levels was delayed by 2 or 3 weeks in `KM95-A68' in comparison to `Kokei No. 14'. Maximum root ZR levels in `Kokei No. 14' were 2.2 times higher in comparison to `KM95-A68'. This appeared to be a factor in delayed storage root formation of `KM95-A68'. Results of reciprocal grafts of `KM95-A68' and `Kokei No. 14' indicated that the late storage root-forming characteristic of `KM95-A68' is a characteristic that arises from the root itself.

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early season (first 20 d) has a direct and significant impact on storage root initiation and thus final yield. Sweetpotato is grown as a rain-fed crop in Mississippi and subjected to fluctuating soil moisture conditions in the field. Sweetpotato is also

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phenological models for optimizing storage root formation. Literature Cited Artschwager, E. 1924 On the anatomy of sweet potato root with notes on internal breakdown J. Agr. Res. 23 157 166 Belehu, T. Hammes, P.S. Robbertse, P.J. 2004 The origin and structure

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μm. Expt. 2: The sequence of events during adventitious root development. The anatomy of stem segments during rooting was investigated to identify the sites of initiation of root primordia and to make a temporal record of the progress of

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failure of individual sweetpotato clones when planted as root pieces. Understanding the developmental physiology and morphology of storage roots in sweetpotato has been useful for indentifying the relationship between root anatomy and yield of sweetpotato

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( Lawrence et al., 1986 ; Overstreet, 2013 ). Cracks induced by the nematodes can also provide an opportunity for decay organisms to enter the root and cause secondary storage rots. Current management options for Meloidogyne spp. in sweetpotatoes include

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vegetative and reproductive sinks ( Hicklenton, 1990 ; Williams, 1988 ). Manipulation of sinks capacity may enhance sweetpotato yield through assimilates repartitioning. The sweetpotato is a storage root and a major carbohydrate sink. Suppressing the growth

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) first suggested the link between lateral root (LR) development and storage root formation. Growing conditions during the transition from primary to secondary growth directly influence the onset of storage root formation, which is marked by the appearance

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In sweetpotato ( Ipomoea batatas ), knowledge about the factors that determine SRL is of scientific and practical importance because SRL helps to determine storage root size and shape ( Lowe and Wilson, 1974 ). In the processing industry, especially

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