Key Laboratory of Sweetpotato Biology and Genetic Breeding

Tongshan, China

Key Laboratory of Sweetpotato Biology and Genetic Breeding

Tongshan, China
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Liu M.,Xuzhou Sweetpotato Research CenterJiangsu | Liu M.,Key Laboratory of Sweetpotato Biology and Genetic Breeding | Zhang A.,Xuzhou Sweetpotato Research CenterJiangsu | Zhang A.,Key Laboratory of Sweetpotato Biology and Genetic Breeding | And 8 more authors.
HortScience | Year: 2017

Potassium (K+) is an essential nutrient element for the growth and development of sweetpotato [Ipomoea batatas (L.) Lam.]. To investigate growth and physiological responses to K+deficiency during early growth stage of sweetpotato, two representative cultivars with different tolerance to K+deficiency were chosen. The seedlings of ‘Xushu 32’ (tolerance to K+deficiency) and ‘Ningzishu 1’ (sensitive to K+deficiency) were cultured in three different K+concentrations (K0: 0 mmol·L‑ K+; K1: 5 mmol·L-1K+; and K2: 20 mmol·L-1K+, the control) of nutrient solution. Results showed that the extreme K+deficiency (K0) significantly reduced the total dry weight, leaf number, root length, and chlorophyll content (CCI) compared with K2. However, the growth traits of ‘Xushu 32’ were less suppressed than those of ‘Ningzishu 1’. The net photosynthetic rate (Pn), stomatal conductance (gS), and transpiration rate (Tr) of ‘Ningzishu 1’ were significantly decreased in K0 and K1 (low K+), whereas ‘Xushu 32’ showed no significant change in K1 treatment. Increasing minimal fluorensence (F0) of ‘Ningzishu 1’ comes with decreased maximum quantum efficiency of photosystem II (PSII) photochemistry (Fv/Fm) and photochemical quenching (qP) at K0 treatment. However, all the chlorophyll fluorescence parameters in ‘Xushu 32’ were nonsignificantly changed by K+deficiency (K0 and K1). These results suggest that ‘Xushu 32’ could maintain a better growth state to adapt to K+deficiency stress, which may be mainly because of a lighter affected photosynthesis and a less damaged PSII reaction center. © 2017, American Society for Horticultural Science. All rights reserved.


Tang Z.-H.,Nanjing Agricultural University | Tang Z.-H.,Chinese Academy of Agricultural Sciences | Tang Z.-H.,Key Laboratory of Sweetpotato Biology and Genetic Breeding | Zhang A.-J.,Chinese Academy of Agricultural Sciences | And 9 more authors.
Acta Physiologiae Plantarum | Year: 2015

Potassium (K+) is an essential mineral element affecting plant growth and development. The aim of this study was to investigate the physiological response to K+ deficiency in three sweet potato (Ipomoea batatas [L.] Lam.) cultivars with differing K+ utilization efficiencies (KUE). The effects on plant growth status, physiological characteristics, leaf ultrastructure, and photosynthesis were examined. The results showed that K+ deficiency significantly decreased total biomass productivity, root yield, photosynthetic efficiency, and chlorophyll (Chl) content, while increased leaf sucrose and proline content of the three cultivars. K+ deficiency caused acute damage to chloroplast ultrastructure associated with leaf Chl biosynthesis and photosynthate accumulation, and also disturbed the protective enzymes involved in the antioxidative defense system. Compared with the other two cultivars, Xushu32 had higher root yield and better growth performance under K+ deficiency, which was mainly attributed to its high KUE and greater carbohydrate conversion and net photosynthetic efficiency. As a whole, these data suggest that greater tolerance to K+ deficiency among sweet potato genotypes is associated to the capability to mount a stronger physiological stress response during growth. © 2015, Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków.

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