Abstract Detail



Physiology

Kriss , Tayler J [1], Maricle, Brian [2].

Greening rate and photosynthetic development of leaves in corn and bean.

Development of light use and CO2 uptake in photosynthesis has not been studied in young plants while transitioning from an etiolated to a green state. To examine these phenomena, plants were germinated and grown in darkness for two weeks. Then the plants were introduced to sunlight conditions in a greenhouse so plants would start chlorophyll production. Plants were measured daily from 0 to 10 days in sunlight and photosynthetic capacity was determined with fluorescence, gas exchange, and chlorophyll concentration. It took 5 days of sunlight exposure for chlorophyll concentrations to reach maximum levels in corn and bean. In corn and bean, photosynthesis and stomatal conductance reach maximum levels at 6 days of sunlight exposure. Maximum fluorescence of corn in light was measured at 7 days of sunlight and at 6 days in bean. Intercellular CO2 concentration in corn fell 64.8% from day 1 to 8, whereas a 26.3% decrease was observed in bean. Measurements are planned for several more species to compare developmental differences between C3 and C4 photosynthetic type leaves.


1 - Fort Hays State University , Department of Biological Sciences, 600 Park St #1, Hays, KS 67601, Hays, KS, 67601, USA
2 - Fort Hays State University, Department of Biological Sciences, 600 Park St , Hays, KS 67601, Hays, KS, 67601, United States

Keywords:
chlorophyll fluorescence
greening
photochemistry
Leaf Development
gas exchange.

Presentation Type: Poster
Number: PPH002
Abstract ID:870
Candidate for Awards:None


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