Elements of Plant Science
Elements of Plant Science ABAS 1610
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This 13 page Class Notes was uploaded by Ayden Heidenreich on Wednesday September 23, 2015. The Class Notes belongs to ABAS 1610 at Middle Tennessee State University taught by Nathan Phillips in Fall. Since its upload, it has received 30 views. For similar materials see /class/212963/abas-1610-middle-tennessee-state-university in Agricultural & Resource Econ at Middle Tennessee State University.
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Date Created: 09/23/15
Climate and Plant Responses ABAS 1610 Elements of Plant Science Dr Nate Phillips Primary Reference Hartmann s Plant Science Chapter 4 McMahon MJ Kofranek AM and VE Rubatsky Climate vs weather 0 Climate prevailing weather conditions Intensity and duration of solar radiation Temperature Rainfall Wind speed and direction Weather actual values of climatic variables Regional Climate Solar radiation Factors modifying climate Altitude Land or water Barriers to air circulation Macroclimate Microclimate Climate 9 vegetation Human impact Heat islands Forest clearance Dust and pollutants Ecotypes Plants evolved for optimal success in their natural environments Ecotypes within species adaptation Wild and cultivated We can improved a cultivated plants success by exploiting this ecotypic variation Allium acuminatum germination germination 100 80 60 40 20 Allium acuminatum 8 12 weeks at 3 C 20 24 A brandeqei seedling RGR BMW12 C Blow15 C amid12 C EIrnid lET mhigh12 f3 highlE C Figure 5 Mean A brandegei seedling relative growth rates mg gquot1 d4 for three intervalsi during the active growth phase Within each time interval mean RGR S den ted H letter are not significantly different P lt 005 Solar radiation Largest energy input Spectrum from ultraviolet to infra red 40 is between 400 and 700nm Intensity Highest at equator 90 degree angle Decreases at higher and lower latitudes Solar Intensitv Solar intensity decreases at higher and lower latitudes because At the equator angle of sun 909 relative to the earth s surface Radiation travels the least distance through atmosphere and reaches minimum surface area at the equator The intensity at noon at 409 N is about 60 what it is at the equator 0 100 200 300 Wm2 Figure 4 2 Solar energy reaching the earth s surface So lar radiation passes through more air and is spread over a wider area at higher latitudes Source Michael Knee Daylength and seasonality The earth revolves once every 24 hours Daylength average is 12 hours Variation results from tilt of the axis 145 degrees Summer solstice North pole tilted towards the sun Winter solstice North pole tilted away from the sun Spring and Autumn equinox 12 hours everywhere Plant adaptation Plants adapt to prevailing light conditions Species below canopies adapted to less lower light conditions 0 Biological clock Photoperiodism Short day and long day plants Short and long is relative
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