The Physiological Basis of Heterosis for Potassium Uptake of Hybrid Millet


Hybrid millet Zhang and its parental cultivars were studied for their potassium (K) uptake and accumulation characteristics and related physiological mechanisms. Hydroponic culture was performed with two K levels (i.e., high and low) set up. At high K level, hybrid millet showed heterobeltiosis in K accumulation and leaf K content, and it also had higher H+-ATPase activity, respiration rate, root oxidant activity and root K+ influx rate than its parental cultivars. All these lay the physiological foundation of heterosis for potassium uptake of hybrid millet. At low K level, the hybrid millet had a lower H+-ATPase activity and a higher K efflux rate than its parental cultivars, thus heterobeltiosis in K accumulation or leaf K content was not observed. Therefore, high level K fertilizer application is recommended for hybrid millet cultivation as it is favorable for hybrid millet to display heterosis in K uptake and K accumulation.

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Liu, Z. , Liu, B. , Zhang, H. , Li, G. , Zhang, Y. and Guo, X. (2014) The Physiological Basis of Heterosis for Potassium Uptake of Hybrid Millet. American Journal of Plant Sciences, 5, 2006-2014. doi: 10.4236/ajps.2014.513215.

Conflicts of Interest

The authors declare no conflicts of interest.


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