McGlasson W B, Poovaiah B W, Dostal H C
Department of Horticulture, Purdue University, West Lafayette, Indiana 47907.
Plant Physiol. 1975 Oct;56(4):547-9. doi: 10.1104/pp.56.4.547.
Leaf segments of tomato plants (Lycopersicon esculentum Mill.) of a normal strain and of two nonripening mutants rin and nor were aged in darkness. Respiration in leaf segments of all strains followed a climacteric-like pattern which was accompanied by a similar pattern of ethylene production. l-Methionine-U-(14)C vacuum-infiltrated into leaf segments at the beginning of the climacteric-like rise in respiration was metabolized to ethylene and CO(2) during the subsequent 48 hours to about the same extent in all strains. Pericarp disks of immature fruits of all strains also metabolized l-methionine-U-(14)C to ethylene and CO(2) to about the same extent during the first 48 hours following cutting and vacuum infiltration. Conversion of methionine to ethylene in disks was much more efficient than in aging leaf segments. The apparent capacity for increased production of ethylene in aging leaf segments and in response to wounding in pericap disks of rin and nor is contrasted with the absence of a respiratory climacteric and an associated large increase in ethylene production during natural aging of intact fruits of these two strains.
正常品系以及两个非成熟突变体rin和nor的番茄植株（Lycopersicon esculentum Mill.）的叶片切段在黑暗中进行老化处理。所有品系叶片切段的呼吸作用都呈现出类似跃变的模式，同时伴随着类似的乙烯生成模式。在呼吸作用出现类似跃变上升的开始阶段，通过真空渗入叶片切段的L-甲硫氨酸-U-（14）C在随后的48小时内代谢为乙烯和二氧化碳，所有品系的代谢程度大致相同。所有品系未成熟果实的果皮圆片在切割和真空渗入后的最初48小时内，也将L-甲硫氨酸-U-（14）C代谢为乙烯和二氧化碳，代谢程度大致相同。圆片中甲硫氨酸向乙烯的转化比老化叶片切段中更高效。与这两个品系完整果实自然老化过程中不存在呼吸跃变以及乙烯生成没有相关大幅增加形成对比的是，rin和nor的老化叶片切段中乙烯生成增加的表观能力以及果皮圆片对创伤的响应。
