Abstract
McClendon, John H. (U. Delaware, Newark.) The relationship between the thickness of deciduous leaves and their maximum photosynthetie rate. Amer. Jour. Bot. 49(4): 320–322. Illus. 1962.—Data of Willstätter and Stoll (25°, saturating light and CO2) are used to show that it is useful to plot photosynthetie rate per unit area as a function of the density thickness (g/cm2; fresh wt) of the leaves. Data for 23 species were plotted together. If P is photosynthetie rate, T the total density thickness, E the density thickness of the epidermis, a linear relation is found using the maximum values of P, such that P = R (T - E), where R is about 30 (mg CO2) (hr)-1 (g F.W.)-1. Using this expression, 15 species were represented by values of R over 23, while very young leaves, aurea2 leaves and a few others fell in the range 8–16. A mean value of E was taken, from other data, to be about 3 × 10-3 g/cm2, while T ranged from 10 to 40 × 10-3 g/cm2, and P ranged from 0.2 to 0.8 (mg CO2) hr-1 cm-2 for “normal” leaves.
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Claims 6
Claim · model-written summary
Maximum photosynthetic rate per area was linearly related to leaf density thickness after accounting for epidermis thickness.
- Taxon
- Deciduous Leavest0
- Organ / stage
- Leavest0
- Outcome
- photosynthetie ratee1
- Value
- 30 (mg CO2) (hr)-1 (g F.W.)-1e0
Not reportedDirection
Verbatim
e0“a linear relation is found using the maximum values of P, such that P = R (T - E), where R is about 30 (mg CO2) (hr)-1 (g F.W.)-1”
t0“Deciduous Leaves”
e1“If P is photosynthetie rate, T the total density thickness, E the density thickness of the epidermis”
Claim · model-written summary
Fifteen species had R values over 23.
Verbatim
e0“15 species were represented by values of R over 23”
t0“Deciduous Leaves”
Claim · model-written summary
Very young leaves, aurea2 leaves and a few others had R values of 8–16.
Verbatim
e0“very young leaves, aurea2 leaves and a few others fell in the range 8–16”
t0“Deciduous Leaves”
Claim · model-written summary
The mean epidermal density thickness used was about 3 × 10-3 g/cm2.
Verbatim
e0“A mean value of E was taken, from other data, to be about 3 × 10-3 g/cm2”
t0“Deciduous Leaves”
Claim · model-written summary
Normal leaves had total density thickness from 10 to 40 × 10-3 g/cm2.
Verbatim
e0“T ranged from 10 to 40 × 10-3 g/cm2”
t0“Deciduous Leaves”
Claim · model-written summary
Normal leaves had photosynthetic rates from 0.2 to 0.8 (mg CO2) hr-1 cm-2.
Verbatim
e0“P ranged from 0.2 to 0.8 (mg CO2) hr-1 cm-2 for “normal” leaves”
t0“Deciduous Leaves”