Premium
How will plant pathogens adapt to host plant resistance at elevated CO 2 under a changing climate?
Author(s) -
Chakraborty Sukumar,
Datta Somnath
Publication year - 2003
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2003.00842.x
Subject(s) - cultivar , biology , fecundity , inoculation , population , colletotrichum gloeosporioides , microclimate , host (biology) , horticulture , pathogen , colletotrichum , botany , resistance (ecology) , agronomy , ecology , microbiology and biotechnology , demography , sociology
Summary• To better understand evolution we have studied aggressiveness of the anthracnose pathogen, Colletotrichum gloeosporioides , collected from Stylosanthes scabra pastures between 1978 and 2000 and by inoculating two isolates onto two cultivars over 25 sequential infection cycles at ambient (350 ppm) and twice‐ambient atmospheric CO 2 in controlled environments.• Regression analysis of the field population showed that aggressiveness increased towards a resistant cultivar, but not towards a susceptible cultivar, that is no longer grown commercially.• Here we report for the first time that aggressiveness increased on both cultivars after a few initial infection cycles at twice‐ambient CO 2 as isolates adapted to combat enhanced host resistance, while at ambient CO 2 this increased steadily for most cycles as both cultivars selected for increased aggressiveness. Genetic fingerprint and karyotype of isolates changed for some CO 2 ‐cultivar combinations, but these were not related to changed aggressiveness.• At 700 ppm fecundity increased for both isolates, and this increased population size, in combination with a conducive microclimate for anthracnose from an enlarged plant canopy under elevated CO 2 , could accelerate pathogen evolution.