DIADE (Diversité, Adaptation, Développement des Plantes), University of Montpellier, CIRAD (Centre de Coopération Internationale en Recherche Agronomique pour le Développement), IRD (Institut de Recherche pour le Développement), 34393 Montpellier, France.
CIRAD, UMR (Unité Mixte de Recherche) DIADE, 34398 Montpellier, France.
Genes (Basel). 2021 Oct 28;12(11):1724. doi: 10.3390/genes12111724.
The developmentally programmed loss of a plant organ is called abscission. This process is characterized by the ultimate separation of adjacent cells in the abscission zone (AZ). The discovery of an American oil palm () variant that does not shed its has allowed for the study of the mechanisms of ripe fruit abscission in this species. A comparative transcriptome analysis was performed to compare the fruit AZs of the non-shedding variant to an individual of the same progeny that sheds its ripe fruit normally. The study provides evidence for widespread perturbation to gene expression in the AZ of the non-shedding variant, compared to the normal fruit-shedding control, and offers insight into abscission-related functions. Beyond the genes with known or suspected roles during organ abscission or indehiscence that were identified, a list of genes with hormone-related functions, including ethylene, jasmonic acid, abscisic acid, cytokinin and salicylic acid, in addition to reactive oxygen species (ROS) metabolism, transcriptional responses and signaling pathways, was compiled. The results also allowed a comparison between the ripe fruit abscission processes of the African and American oil palm species at the molecular level and revealed commonalities with environmental stress pathways.
器官发育程序性丧失称为脱落。这个过程的特征是在脱落区（AZ）中相邻细胞的最终分离。发现一种不脱落的美洲油棕（）变体，从而可以研究该物种成熟果实脱落的机制。进行了比较转录组分析，以比较不脱落变体的果实 AZ 与正常脱落其成熟果实的同一后代个体。该研究提供了证据，表明与正常果实脱落对照相比，不脱落变体的 AZ 中基因表达广泛受到干扰，并提供了对与脱落相关的功能的深入了解。除了鉴定出在器官脱落或不开裂过程中具有已知或可疑作用的基因外，还列出了与激素相关功能的基因列表，包括乙烯、茉莉酸、脱落酸、细胞分裂素和水杨酸，以及活性氧物质（ROS）代谢、转录反应和信号通路。结果还允许在分子水平上比较非洲和美洲油棕物种的成熟果实脱落过程，并揭示与环境胁迫途径的共同之处。
