Department of Biological Sciences, University of Newcastle, 2308, N.S.W., Australia.
Planta. 1979 Jan;146(1):107-12. doi: 10.1007/BF00381262.
(14)C-photosynthate transfer in decapitated stems of P. vulgaris plants, treated with IAA (indol-3yl-acetic acid), appeared, as ascertained by microautoradiography, to be restricted to cells of sieve-element appearance. The IAA-induced promotion of photosynthate transport was found not to depend on any artifacts caused by the decapitation procedure. Rather, decapitation primarily served the purpose of removing photosynthate sources above the point of hormone application which otherwise suppressed the expression of the IAA effect on acropetal photosynthate transport. Furthermore, by manipulating stem levels of endogenous auxins with the inhibitor of polar auxin transport, 1-(2(1)-carboxyphenyl)-3-phenylpropane-1,3-dione (ACP1.55), evidence was obtained indicating that photosynthate transfer to the shoot apex depended, at least in part, on endogenous levels of auxins at site(s) remote from the apical sink (i.e. shoot apex).
去顶的普通豚草植物茎切段中 C-同化物的转移，经放射自显影术确定，似乎仅限于筛管细胞。发现 IAA 诱导的同化物运输促进作用并不依赖于去顶过程中任何假象的产生。相反，去顶主要是为了去除激素施加点以上的同化物源，否则这些源会抑制 IAA 对向顶同化物运输的作用。此外，通过用极性生长素运输抑制剂 1-(2-(1)-羧基苯基)-3-苯基丙烷-1,3-二酮（ACP1.55）来操纵茎内内源生长素的水平，获得了证据表明，向茎尖的同化物转移至少部分取决于远离顶端汇（即茎尖）的部位的内源生长素水平。
