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Diurnal and Seasonal Photosynthesis in Two Asparagus Cultivars with Contrasting Yield

^a Dep. of Plant and Microbial Sciences, Univ. of Canterbury, Private Bag 4800, Christchurch, New Zealand
^b New Zealand Institute of Crop and Food Research, P.O. Box 4704, Christchurch, New Zealand

View larger version (23K): [in a new window]   Fig. 1. Diurnal and seasonal changes in the rate of net photosynthesis (A) and stomatal conductance (gs) between ASP-69 (•) and ASP-03 (). Results are means of six replicates ± SE. Significant differences between ASP-69 and ASP-03 are indicated as *, P < 0.05; **, P < 0.01; ***, P < 0.001.

View larger version (21K): [in a new window]   Fig. 2. Relationship between stomatal conductance (gs) and net photosynthetic rate by plotting individual values of maximum net photosynthetic rate from each measuring days against concurrent stomatal conductance values.

View larger version (41K): [in a new window]   Fig. 3. Seasonal changes in (a) maximum photochemical efficiency Fv/Fm, (b) total chlorophyll content, (c) chlorophyll a/b ratio and (d) soluble protein content measured between 1100 to 1200 h in cladophylls of ASP-69 (closed bar) and ASP-03 (open bar). Results are means of six replicates ± SE. Significant differences between ASP-69 and ASP-03 are indicated as *, P < 0.05; **, P < 0.01; ***, P < 0.001. Different letters within cultivars indicate statistically different values P < 0.05 as determined by Tukey's test.