Abstract For seven days of wheat growth, caryopsis remained the main source of 5-n-alkylresorcinols with C19 and/or C21 homolog as a main compound. Shoot contained small amount of these phenolic lipids; their average content was 3.23% of level obtained in the whole seedling. Moreover, 41.38% of resorcinolic lipids of seven-day-old shoot was accumulated in part of leaf covered by coleoptile. Interestingly, a removal of 1.07% of the primary pool of kernel alkylresorcinols by short-term washing (10 s) of wheat seed with acetone before planting decreased their level only in seed of seven-day old seedling. Compared to the respective controls, this treatment did not affect the amount of these lipids in the green part of seedling that proved that de novo synthesis of 5-n-alkylresorcinols takes place in shoots. The very similar homolog profiles of these lipids in four- and seven-day-old shoots turned out to be markedly less diversified than those found in respective seed samples. Compared to the mature wheat caryopsis, the rise in the content of very-long-chain homologs was observed only in the oldest shoot. Their increased accumulation was probably connected with formation of cuticular layer providing the defensive barrier against various phytopathogens.

中文翻译：

---

监测小麦幼苗发育过程中 5-n-烷基间苯二酚的变化

摘要 在小麦生长 7 天中，颖果仍然是 5-n-烷基间苯二酚的主要来源，其中 C19 和/或 C21 同源物是主要化合物。芽中含有少量这些酚类脂；它们的平均含量是整个幼苗获得水平的 3.23%。此外，7 天龄芽的间苯二酚脂质有 41.38% 积累在被胚芽鞘覆盖的部分叶片中。有趣的是，通过在种植前用丙酮短期洗涤（10 秒）小麦种子去除 1.07% 的主要谷粒烷基间苯二酚，仅在 7 天龄幼苗的种子中降低了它们的水平。与各自的对照相比，这种处理不影响幼苗绿色部分中这些脂质的量，这证明 5-n-烷基间苯二酚的从头合成发生在枝条中。这些脂质在 4 天和 7 天大的枝条中非常相似的同系物谱结果证明其多样性明显低于各自种子样品中发现的那些。与成熟的小麦颖果相比，仅在最老的枝条中观察到极长链同源物含量的增加。它们的积累增加可能与表皮层的形成有关，提供了针对各种植物病原体的防御屏障。