Poster: Vegetative Development
Abs #
424: Physiological and anatomical characterization of a late storage root-forming mutant of sweetpotato
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Presenter: |
Nakatani, Makoto , mnakatan@affrc.go.jp |
Authors | Nakatani, Makoto (A) Tanaka, Masaru (B) Yoshinaga, Masaru (C) | | Affiliations: |
(A): National Institute of Crop Science
(B): National Agricultural Research Center for Kyushu Okinawa Region
(C): Agriculture,Forestry and Fisheries Research Council
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We characterized a late storage root-forming mutant, eKM95-A68f, to clarify the physiological mechanisms of storage root formation in sweetpotato (Ipomoea batatas (L) Lam.). This mutant originated from a somaclonal mutation of cultivar eKokei No. 14f. The storage roots of eKM95-A68f were rare and, if formed, develop two or three weeks later than those which originated eKokei No. 14f. The morphological characteristics of the canopy and leaf photosynthetic rates of eKM95-A68f were similar to those of the original cultivar. No apparent differences were observed in the anatomical characteristics of root cross sections of eKM95-A68f and eKokei No. 14f. An apparent increase in the root zeatin riboside (ZR) level was observed in eKokei No. 14f at storage root formation. Root ZR level differed between clones eKokei No.14f and eKM95-A68f. The onset of increase in root ZR level was delayed by two or three weeks in eKM95-A68f in comparison to eKokei No.14f. Maximum root ZR level in eKokei No.14f was 2.2 times higher in comparison to eKM95-A68f. This appeared to be a factor in the delayed storage root formation in eKM95-A68f. Although no apparent increase in root abscisic acid (ABA) level was observed in eKM95-A68f, an apparent increase in storage root ABA level was observed in eKokei No.14f two or three weeks after their storage root formation. This may suggest the involvement of ABA in the active accumulation of photosynthates in storage roots. The results of experiments using reciprocal grafts of eKM95-A68f and eKokei No. 14f indicated that the late storage root-forming characteristic of eKM95-A68f is a characteristic that arises from the root itself.
