However, this calculation is unnecessary since power coefficients ( c_{text{p}} ) is ( c_{{{text{p}}_hbox{max} }} ) for the OPTS.
According to the OPTS, ( omega_{{{text{r}}_{text{pu}}}} ) can be calculated through the solution of ( partial C_{text{p}} /partial omega_{{{text{r}}_{text{pu}}}} = 0 ).
Phylogenetic analyses of plant OPT members have revealed two distant clades: the yellow stripe-like (YSL) proteins and the OPTs.
The OPTs genes are non-randomly distributed across the Populus and Vitis chromosomes, and a high proportion of the OPT genes may be derived from tandem duplications.
One possible explanation may be that, in LD conditions, grape plants need more transporters (such as the OPTs) to transport more oligonucleotide peptides for increased carbohydrate synthesis.
Further analyses of functional divergence and adaptive evolution show that, while purifying selection may have been the main force driving the evolution of the OPTs, some of critical sites responsible for the functional divergence may have been under positive selection.
