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When fast shoot extension is insufficient to allow the plant to re-surface, the expenditure in energy and respirable substrates needed to support the faster underwater growth may threaten survival.
Under CID-Stage I and CID-Stage II, rice was characterized by faster shoot elongation, larger single leaf area extension, and more total dry mass, as a higher photosynthetic rate was maintained during and after submergence.
They further selected two contrasting genotypes, one with slow shoot elongation (DV85; 0.3 cm) and the other with faster shoot elongation (Kinmaze; 3.1 cm), and crossed them to develop a set of 81 recombinant inbred lines.
This suggests that fast shoot growth in response to shade and submergence cues are not only phenotypically very similar (Pierik et al. 2010), but that they also share a conserved downstream signalling pathway.
In a single field season in North Carolina, all populations showed low post-reproductive survival regardless of vegetative size after flowering, so there may be little or no net fitness cost for a faster shoot reproductive transition.
Indeed, while overexpression of IPT in plants resulted in faster shoot formation, shorter internodes, loss of apical dominance, delay of leaf senescence, higher photosynthetic rates and accumulation of tZ and its riboside [ 13- 16], Arabidopsis ipt deficient plants showed strong inhibition of shoot growth, elongation of primary and lateral roots, and reduction of tZ and iP contents [ 17].
The very fast shoot growth frequently seen in lianas under natural conditions (Teramura et al., 1991) may, however, be also partly attributed to their ability to place apical meristems and leaves quickly in favourable (i.e. well-lit) locations and overgrow and shade their competitors, rather than to their inherently faster relative growth rate (Gartner, 1991).
