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Previously, we obtained the sweetpotato somatic hybrid KT1 from a cross between sweetpotato ( Ipomoea batatas  (L.) Lam.) cv. Kokei No. 14 and its drought-tolerant wild relative  I .  triloba  L. KT1 not only inherited the thick storage root characteristic of Kokei No. 14 but also the drought-tolerance trait of  I .  triloba  L. The aim of this study was to explore the molecular mechanism of the drought tolerance of KT1. Four-week-old  in vitro -grown plants of KT1, Kokei No. 14, and  I .  triloba  L. were subjected to a simulated drought stress treatment (30% PEG6000) for 0, 6, 12 and 24 h. Total RNA was extracted from samples at each time point, and then used for transcriptome sequencing. The gene transcript profiles of KT1 and its parents were compared to identify differentially expressed genes, and drought-related modules were screened by a weighted gene co-expression network analysis. The functions of ABI-like protein and Ca 2+ -ATPase, two proteins screened from the cyan and light yellow modules, were analyzed in terms of their potential roles in drought tolerance in KT1 and its parents. These analyses of the drought responses of KT1 and its somatic donors at the transcriptional level provide new annotations for the molecular mechanism of drought tolerance in the somatic hybrid KT1 and its parents.

plos one

Involvement of an ABI-like protein and a Ca2+-ATPase in drought tolerance as revealed by transcript profiling of a sweetpotato somatic hybrid and its parents Ipomoea batatas (L.) Lam. and I. triloba L.