de Dios Pablo, Matilla Angel Jesús, Gallardo Mercedes
Lab. de Fisiología Vegetal, Fac. de Biología, Edificio de Ciencias Experimentales, Universidad de Vigo, Pontevedra, Spain.
J Plant Physiol. 2006 Jan;163(1):86-97. doi: 10.1016/j.jplph.2005.03.007.
The flower opening of damson plum (Prunus insititia L.) was accompanied by an increase in the content of free-polyamines (PA) in the sepals, petals and sex organs, the ovary being most active in accumulating spermine (Spm). The fertilization process and senescence brought on a decline in ovarian Spm, but stimulated putrescine (Put) and spermidine (Spd) content in the sepals. The endocarp of this climacteric fruit produced only ethylene at the end of the S1 phase and throughout S2, in which there was a great richness in ACC and MACC. The greatest amounts of ACC and MACC were observed in the ripening mesocarp and epicarp. The contribution of the endocarp and epicarp to the total ACC in the developing fruit was very similar. During flowering and S1 and S2 phases, Spd was the most abundant PA; in contrast, during S3 and S4 Put was most abundant. The mesocarp contributed the most to the total content in PA throughout the fruit development. The control of SAM distribution towards ethylene and/or PA appears to differ during the development of the endocarp, as the only peak of free-Put (detected in S2) coincided with the highest ACC accumulation and ethylene production. On the contrary, in S3 it is probable that SAM was transformed preferentially into PA, given that free-Spd and Spm, hardly detectable in S1 and S2, peaked in this phase in which there was no gas production.
西洋李（Prunus insititia L.）开花时，萼片、花瓣和性器官中的游离多胺（PA）含量增加，子房在积累精胺（Spm）方面最为活跃。受精过程和衰老导致子房Spm含量下降，但刺激了萼片中腐胺（Put）和亚精胺（Spd）的含量。这种跃变型果实的内果皮仅在S1期结束时和整个S2期产生乙烯，其中ACC和MACC含量丰富。在成熟的中果皮和外果皮中观察到最大量的ACC和MACC。内果皮和外果皮对发育中果实总ACC的贡献非常相似。在开花期以及S1和S2期，Spd是最丰富的PA；相反，在S3和S4期，Put最丰富。在整个果实发育过程中，中果皮对PA总含量的贡献最大。在内果皮发育过程中，SAM向乙烯和/或PA的分配控制似乎有所不同，因为游离Put的唯一峰值（在S2期检测到）与最高的ACC积累和乙烯产生同时出现。相反，在S3期，SAM可能优先转化为PA，因为在S1和S2期几乎检测不到的游离Spd和Spm在该阶段达到峰值，而此阶段没有气体产生。
