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"From Kozlowski and Borger (1971).

'Values are means ± SEM (n = 50). Seedlings were grown from seed for 32 days at 23-25°C and a light intensity of 750 lux (1.6 X 10-' ergs/cmVsec); they were subsequently grown for 44 days at indicated temperatures and a light intensity of 13,000 lux (2.6 X 104 ergs/cmVsec). At 10°C, 27 of 50 plants had expanded primary needles; at 15°C, 48 of 50 plants had expanded primary needles.

"From Kozlowski and Borger (1971).

'Values are means ± SEM (n = 50). Seedlings were grown from seed for 32 days at 23-25°C and a light intensity of 750 lux (1.6 X 10-' ergs/cmVsec); they were subsequently grown for 44 days at indicated temperatures and a light intensity of 13,000 lux (2.6 X 104 ergs/cmVsec). At 10°C, 27 of 50 plants had expanded primary needles; at 15°C, 48 of 50 plants had expanded primary needles.

Table 2.7 Effect of Light Intensity on Initiation and Expansion of Primary Needles of Red Pine« 4

Average number of visible primary needles after: Treatment 32 days 39 days 46 days 53 days 60 days

6480 lux (1.3 X 3.9 ± 0.24 7.6 ± 0.24 12.3 ± 0.30 17.3 ± 0.39 21.7 ± 0.48 104 ergs/cm2/ sec), 25°C

13,000 lux (2.6 X 7.4 ± 0.14 11.8 ± 0.32 16.3 ± 0.38 21.6 ± 0.43 25.3 ± 0.52 104 ergs/cm2/ sec), 25°C

"From Kozlowski and Borger (1971).

'Values are means ± SEM. Time intervals indicate number of days after sowing.

Figure 2.16 Effects of reexposure of red pine seedlings to light, after various periods of dark treatment, on elongation of primary needles. From Sasaki and Kozlowski (1970).

Table 2.8 Growth and Compositional Changes of Ten-Day-Old Green Ash Cotyledons and Seedlings with Endosperm Removed at Two-Day Intervals»

Cotyledon

Intact total non-

Table 2.8 Growth and Compositional Changes of Ten-Day-Old Green Ash Cotyledons and Seedlings with Endosperm Removed at Two-Day Intervals»

Cotyledon

Intact total non-

Seedling age (days)

Endosperm

Cotyledon length (cm)

Cotyledon dry weight (mg/ cotyledon)

seedling dry weight

(mg)

Cotyledon protein (mg/cotyledon)

Cotyledon lipids (mg/cotyledon)

structural carbohydrates (mg/cotyledon)

Cotyledon chlorophyll (mg/cotyledon)

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