Synergistic effects of some plant growth regulators on in vitro shoot proliferation of korarima (Aframomum corrorima (Braun) Jansen)

The synergistic effects of some plant growth regulators was investigated upon shoot proliferation and growth of korarima (Aframomum corrorima (Braun) Jansen), an important culinary and medicinal plant species native to Ethiopia. Cultures were initiated from axillary bud explants of rhizome using Murashige and Skoog (1962) (MS) medium added with 5% coconut water (CW). The use of 0.5 mg/l thidiazuron (TDZ) in combination with 3 mg/l paclobutrazol (PBZ) gave about 26 shoots/explant (about 12.6-fold than the control) within eight weeks time. Shoot multiplication was also enhanced when TDZ at 0.5 mg/l was simultaneously used with either 2 mg/l imazalil (IMA) or 3 mg/l N6-benzyladenine (BA) in the culture medium. Subsequent shoot elongation and development of functional roots was attained after one to three monthly-subcultures on a plant growth regulator (PGR)-free basal medium. The protocol developed from the present study could be used for the large-scale multiplication of A. corrorima by tissue culture

Productivity growth and business model innovation

Organizational factors have been identified as a possible explanation for total factor productivity and hence the Solow paradox. We posit that business model innovation is a major organizational factor. However, there has not been any systematic study on how business model innovation affects productivity growth rates. We introduce a novel approach of measuring business model innovation using change in the net asset turnover ratio. The study shows that business model innovation contributes significantly to productivity growth across firms in the UK between 2003 and 2017. The study provides empirical support that business model innovation could partially explain the Solow productivity paradox