Pulse-wheat rotation: pulse crops effects on wheat endophytic bacteria, and feedback on wheat yield
Date
2012-03-13
Authors
Yang, C.
Hamel, C.
Gan, Y.
Vujanovic, V.
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Presentation
Degree Level
Abstract
Crop rotation is a common cultivation strategy and the legacy of a previous crop on biotic soil
properties could feedback on the productivity of the following crop due to the mutual influence
existing between plants and their biological environment. Polymerase chain reaction and 454 GS
FLX pyrosequencing of amplicons were used in this study to determine the effects of genotype
and termination time of previous pulse crops on the productivity and endophytic bacterial
community colonizing the roots of durum wheat. In 2008-09, when chickpea plants (late
maturing plant) were terminated as early as yellow pea (In July), all three genotypes of chickpea
passed a sol biota to durum wheat that formed endophytic bacterial community which was similar
to that formed following yellow pea, an early maturing plant. These four endophytic bacterial
communities were different from those formed in wheat roots following late-terminated chickpea
crops. Additionally, late terminated pulse crops (September) led to the formation of endophytic
bacterial communities highly dominated by Firmicutes. These communities were less diverse
than those formed after early-terminated pulse crops, which were dominated by Actinobacteria.
High durum wheat yield was associated with the production of fewer heads m-2 and with the
abundance of endophytic Actinobacteria and Acidobacteria. In contrast, low grain yield was
associated with the abundance of endophytic Firmicutes. The effect of termination time was weak
in 2009-2010, which was probably overridden by the extremely high amount of precipitation
received during this period. The results demonstrate an important biotic legacy of crop
termination time in agro-ecosystems, by influencing the endophytic bacterial colonization on the
following crop. Environmental conditions appear as a key factor for the expression of this effect
of crop termination time in agroecosystems.
Description
Keywords
Citation
Degree
Department
Program
Advisor
Committee
Part Of
Soils and Crops Workshop