Channel: GPhase

Category: Entertainment

Tags: geotropismnegative gravitropismgravitropismnegative geotropismgerminationmustardtime lapseplantplant responseshootplant reacts to gravitydemonstrationtimelapseplant response to gravity

Description: Negative gravitropism demonstration showing how mustard shoots react to change in pot position. Gravitropism is growth or movement response to gravity, observed in plants and fungus. Its is also called – geotropism. Just like phototropism, gravitropism can be positive or negative. To put it simply – positive gravitropism makes plants point same direction as gravity is puling – down, while negative gravitropism is directed upwards. Plants, well, at least mustard, are ridiculously sensitive to light. Before landing on last setup version for this demonstration, I've tried: using direct light from flash, indirect light from flash (both on weakest power setting), indirect light from 3,5 W 2700K light bulb (lowest wattage I could find for wide spectrum light bulb). In all cases plants pointed toward light source. Though, response was a lot weaker, compared to positive phototropism video (youtu.be/DhITXtENPrU). I ended up using indirect light from 3,1 W red light bulb, since phototropic response to red light is normally masked by gravitropic response (nph.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8137.2010.03211.x). For this reason video is desaturated. Light were places in front of plants but pointed away from them and towards the panel to diffuse light. Exposure times were 1 min 15 s with ISO 200 and f/8. Oh, and yeah, all of this was done in a wardrobe, with all gaps covered to avoid external light. It is a big wardrobe. Plants on the right are control group. Most likely reason why all motion ceases in the end – plants ran out of energy. Sequence of images for this video was edited and exported with Capture One, save up to 10% using coupon code: AMBGPHASE Music: Isolated by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/by/4.0/) Source: incompetech.com/music/royalty-free/index.html?isrc=USUAN1100792 Artist: incompetech.com