Table 5.
Pearson’s correlation coefficients between the Rubisco kinetic parameters at 25 °C and 4 °C and either the percentage of Rubisco in the total soluble protein, 13C isotope discrimination, or pH compensation point, considering (A) all 17 seaweed populations together, and (B) the 14 red and brown seaweed populations (all possessing form ID Rubiscos) alone
(A) Data from all populations analyzed together | ||||||
25 °C | 4 °C | |||||
K c | k cat c | k cat c /K c | K c | k cat c | k cat c /K c | |
δ 13 C alga | 0.505* | 0.57* | 0.1 | 0.502* | 0.601* | 0.514* |
pH compensation point | 0.455 | 0.637* | 0.488 | 0.554* | 0.65* | 0.519 |
[Rubisco]/ [TSP] | –0.34 | –0.519* | –0.575* | –0.476 | –0.513* | –0.339 |
(B) Data from red and brown algal species (Form ID Rubiscos) | ||||||
25 °C | 4 °C | |||||
K c | k cat c | k cat c /K c | K c | k cat c | k cat c /K c | |
δ 13 C alga | 0.01 | 0.27 | 0.26 | 0.13 | 0.44 | 0.518 |
pH compensation point | –0.15 | 0.669* | 0.806** | 0.41 | 0.777** | 0.573 |
[Rubisco]/ [TSP] | 0.42 | –0.545 | –0.768** | –0.549 | –0.536 | –0.29 |
k cat c/Kc, carboxylation efficiency; kcatc, carboxylase turnover rate; Kc, Michaelis–Menten affinity constant for CO2; [Rubisco]/[TSP], percentage of Rubisco in the total soluble protein; δ13Calga, 13C isotope discrimination. *P<0.05, **P<0.01, ***P<0.001.