Differential leaf gas exchange performance of mango cultivars infected by different isolates of Ceratocystis fimbriata

作者：da Silva Bispo Wilka Messner; Araujo Leonardo; Moreira Wiler Ribas; Silva Leandro de Castro; Rodrigues Fabricio Avila^*

来源：SCIENTIA AGRICOLA, 2016, 73(2): 150-158.

DOI：10.1590/0103-9016-2015-0022

• Mangifera indica
• mango wilt
• photosynthesis
• vascular disease

Caused by the vascular fungus Ceratocystis fimbriata, mango wilt is considered to be one of the most serious threats in mango-producing regions worldwide. However, changes in leaf gas exchange level and the mechanisms underlying host responses to this fungal infection remain poorly described. This study aimed to evaluate potential changes in the leaf gas exchange of different mango cultivars (Uba, Espada, Haden and Tommy Atkins) in response to two Brazilian isolates of C. fimbriata (CEBS15 and MSAK16) to non-invasively assess cultivar variability in relation to the basal level of resistance to mango wilt. Both isolates, regardless of the cultivar, caused reductions in stomatal conductance and, thus, a reduction in CO2 assimilation via diffusive limitations. Taking into account the full length of the internal lesion and the radial colonization of the stem tissues, both isolates showed equivalent aggressiveness when inoculated into the Haden and Tommy Atkins cultivars. Conversely, when compared to the CEBS15 isolate of C. fimbriata, the MSAK16 isolate was more aggressive in cv. Espada and less aggressive in cv. Uba.

• 出版日期2016-4