Growth cessation

Bohlenius, H., Huang, T., Charbonnel-Campaa, L., Brunner, A.M., Jansson, S., Strauss, S.H., and Nilsson, O., CO/FT regulation module controls timing of flowering and seasonal growth cessation in trees, Science, 312, 1040-1043, 2006. 

The effect of medium osmolarity on the growth of GS-NSO cells was investigated by Bibila et al. [17]. Gell growth was reduced when the osmolarity was increased to 400 mOsm and completely inhibited above 500 mOsm. The specific production rate increased as the osmolarity was increased from the baseline of 270 mOsm to 300 and 400mOsm. However, as a direct result of reduced growth, the cultures at 400 mOsm reached a lower product concentration than the controls. Zhou et al. [2] noted that increases in osmolarity below 450 mOsm had little impact upon productivity, but above this level there was a rapid increase in the specific production rate. However, growth cessation occurred at this elevated osmolarity. 

The discrepancy of theoretical and experimental results at t > 4 min and reaction rate reduction is due to physical aspects of process, but not chemical ones, that follows from the mentioned above growth cessation. The reaction rate reduction is linked with cluster joining probability p reduction [117]. Let us note, that in this case aggregation process will be realized not by means of chemical reaction, but by interpenetration and physical joining of clusters (macromolecular coils) [113]. 

The growth/temperature relationships in GA-sensitive dwarfs of Oryza and Zea are modified towards higher temperatures for growth cessation [17]. Similar studies on Rht i have revealed no differences in growth/temperature relationships, indicating that the dwarfism has a different physiological basis from that pertaining in maize and rice. 

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