Dormancy acclimation physiological changes that lead

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Unformatted text preview: dormancy. dormancy. Acclimation: physiological changes that lead to Acclimation: cold hardiness. cold Many temperate species require cold period Many before dormancy can break. before Nastic Movements (p. 678; 639) 639 Rapid, reversable plant movements Nyctinastic Movements up & down movements of leaves in Nyctinastic response to daily light/ dark cycles. Movement results from changes in size of parenchyma cells Movement in the pulvinus: (A joint-like thickening at a leaf/leaflet base). pulvinus (A Thigmonastic movements: Response to mechanical Thigmonastic Response stimulation. stimulation. Sudden loss of turgor in cells of pulvinus. Result: leaves/ leaflets close rapidly Mimosa sp., Venus flytrap. Neptunia: a native mimosa Open Closed Open Closed Heliotropism: Solar Tracking (p. 680) (p. Many species: Daily Many movements orient leaves or flowers parallel or perpendicular to sun’s rays. to • Cotton • Many legumes • Sunflowers • Arctic rose (video we'll see). Movements involve pulvinus at Movements leaflet /leaf/ flower base. leaflet Focus Plant 6: Thigmonastic Movements Focus Mimosa Sensitive Briars East Texas natives: Common along roadsides & in fields. East Bipinnate compound leaves. Bipinnate Pink “powderpuff” inflorescences: stamens of individual flowers Pink collectively main showy feature. collectively Several similar species: M. strigillosa, M. Hystricina, M. Nutallii. Several Touch triggers rapid closure of leaves. Discourages browsing by deer, etc. Open Mimosa strigillosa Closed The End The Mimosa Nutallii. Version 12.10...
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This document was uploaded on 03/28/2014 for the course BIO 131 at Stephen F Austin State University.

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