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TitleEffect of light intensity on growth, photosynthesis and nitrate reductase in hybrid poplars
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Effect of light intensity on growth, photosynthesis and nitrate reductase in hybrid poplars
	Festus Ejilayo Fasehun
		Recommended Citation
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Page 1

Retrospective Theses and Dissertations
Iowa State University Capstones, Theses and



Effect of light intensity on growth, photosynthesis
and nitrate reductase in hybrid poplars
Festus Ejilayo Fasehun
Iowa State University

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Recommended Citation
Fasehun, Festus Ejilayo, "Effect of light intensity on growth, photosynthesis and nitrate reductase in hybrid poplars " (1975).
Retrospective Theses and Dissertations. 5414.
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Page 2


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Page 47


(Figure 6, Tables 10, 12 and 13). Both height and dry weight

response to light intensity treatment were similar to each

other in all the clones. Clone 5323 had the best growth (both

height and total dry weight), while clone 5326 had the

poorest growth under all the light intensities tested. All

three clones accumulated the least dry weight and were shortest

when grown under the lowest light intensity. With increasing

light intensity, there were marked increases in height, dry

weight accumulation, and percentage of total dry matter in the

roots (Tables 10 and 14). The clones differed in percentage

of total dry weight in the roots and shoot/root ratios under

the different light intensities.

Leaf photosynthesis

The light intensity under which the clones were grown in

the greenhouse did not have a consistent effect on mean photo-

synthetic rates expressed as milligrams per hour per unit leaf

area, but did affect dark respi'ition rates (Table 16). In

general, increased light intensity during growth resulted in

increased dark respiration rates=

As expected, as light intensity of measurement increased,

so did photosynthetic rates of the leaves, especially in leaf

age 20 (Table 15). The clones differed in photosynthetic response

to light intensity. In all the clones, leaf age 20 had higher

Page 48

Figure 6. Dry weight of Populus x euramericana clones grown

for 13 weeks under 3 light intensities (fall 1973).

Page 93


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Page 94


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