de Oliveira Isadora Rubin, Crizel Giseli Rodrigues, Severo Joseana, Renard Catherine M G C, Chaves Fabio Clasen, Rombaldi Cesar Valmor
UFPel, Universidade Federal de Pelotas, CDTec, Programa de Pós-graduação em Biotecnologia, C.P. 354, CEP 96010-000, Pelotas, RS, Brazil.
UFPel, Universidade Federal de Pelotas, FAEM, Departamento de Ciência e Tecnologia Agroindustrial, Programa de Pós-graduação em Ciência e Tecnologia de Alimentos, C.P. 354, CEP 96010-900, Pelotas, RS, Brazil.
Plant Physiol Biochem. 2016 Nov;108:391-399. doi: 10.1016/j.plaphy.2016.08.012. Epub 2016 Aug 13.
Ultraviolet C (UV-C) radiation is known for preventing fungal decay and enhancing phytochemical content in fruit when applied postharvest. However, limited knowledge is available regarding fruit responses to preharvest application of UV-C radiation. Thus, the effects of UV-C radiation on photosynthetic efficiency, dry matter accumulation and partitioning, fruit yield and decay, phytochemical content, and relative transcript accumulation of genes associated with these metabolic pathways were monitored in strawberry (Fragaria x ananassa Duch.) cv. Camarosa. A reduction in photosynthetic efficiency was followed by a decrease in light harvesting complex LhcIIb-1 mRNA accumulation as well as a decrease in yield per plant. Phenylalanine ammonia lyase activity, phenolic, anthocyanin, and L-ascorbic acid contents were higher in UV-C treated fruit. In addition, preharvest UV-C treatment reduced microorganism incidence in the greenhouse and on the fruit surface, increased the accumulation of β-1,3-Gluc and PR-1 mRNA, and prevented fruit decay.
紫外线C（UV-C）辐射在采后应用时，以防止果实真菌腐烂和提高果实植物化学成分含量而闻名。然而，关于果实对采前UV-C辐射的反应，目前了解有限。因此，在草莓（Fragaria x ananassa Duch.）品种Camarosa中，监测了UV-C辐射对光合效率、干物质积累与分配、果实产量与腐烂、植物化学成分含量以及与这些代谢途径相关基因的相对转录积累的影响。光合效率降低之后，光捕获复合体LhcIIb-1 mRNA积累减少，单株产量也下降。UV-C处理的果实中苯丙氨酸解氨酶活性、酚类、花青素和L-抗坏血酸含量更高。此外，采前UV-C处理降低了温室和果实表面的微生物发生率，增加了β-1,3-葡聚糖和PR-1 mRNA的积累，并防止了果实腐烂。
