Experiments on Phyllotaxis. II. The Effect of Displacing a Primordium

摘要: Part 1.— Introduction. (1) Nature and Purpose of the operations, Methods. Experiments on Lupinusalhus were reported previously in which arrangement subsequent leaves was changed as a result isolation from stem apex region next leaf or but one due to arise (Snow Sn o w , 1931). The results led conclusion that each new leaf-primordium arises first space attains both certain minimum width distance below (p. 36), strongly supports v n It e r so ’s theory phyllotaxis (1907). purpose present experiments test this further by means different operation performed same plant. previous paper will therefore be taken again working hypothesis, an attempt made explain basis it. In slight vertical cut radial plane through area primordium arise, other words presumptive Ix (for terminology see section 4). sometimes extended downwards little way area, probably never reached more than very above This considered suitable method for testing conclusions following reasons. Firstly, if centres primordia only positions allow room their stipules, indicated 23), any arising contact with sides wound should at some it, consequently normal position centre Ix. Secondly, these displacements, also changed, they accordance hypothesis