Germination behaviour of Conyza bonariensis to constant and alternating temperatures across different populations
Supiciche, María L.
Chantre, Guillermo R.
MetadataShow full item record
Conyza bonariensis is one of the most problematic weed species throughout the world. It is considered highly noxious due to its interference with human activities, and especially the competition it poses with economically important crops. This research investigated the temperature requirements for seed
germination of four populations of C. bonariensis with distinct origin and the influence of daily alternating temperatures. For this, a set of germination tests were performed in growth chambers to explore the effect of constant and alternating temperatures. Seeds of the four populations (from Lleida, Badajoz and Seville, Spain and Bahía Blanca, Argentina) were maintained at constant temperatures ranging from 5 to 35°C. The final germination and cardinal temperatures (base, optimum and maximum) of each population were obtained. We also tested the influence of daily alternating temperatures on final germination. To do so, seeds were exposed to two temperature regimes: 5/15, 10/20, 15/25, 20/30 and 25/35°C night/day temperature (intervals increasing 5°C, with constant oscillation of 10°C) and to 18/22, 16/24, 14/26, 12/28 and 10/30°C night/day temperature (intervals with average of 20°C, but increasing the oscillation in 4°C between intervals). In general, all populations behaved similarly, with the highest germination percentages occurring in the optimum temperature range (between 21.7°C and 22.3°C) for both constant and alternating temperatures. In general, climatic origin affected germination response, where seeds obtained from the coldest origin exhibited the highest germination percentage at the lowest temperature assayed. In addition, we observed that the alternating temperatures can positively affect total germination, especially in oscillations that were further from the average optimum temperature (20°C), with high germination percentage for the oscillations of 15/25, 20/30, 18/22, 16/24, 14/26, 12/28 and 10/30°C in all populations. The cardinal temperatures obtained were significantly different across the populations. These results provide information that will facilitate a better understanding of the behaviour of Conyza and improve current field emergence models.
Is part ofAnnals of Applied Biology, 2019. In press
Showing items related by title, author, creator and subject.
Efficiency, profitability and carbon footprint of different management programs under no-till to control herbicide resistant Papaver rhoeas Recasens i Guinjuan, Jordi; Royo-Esnal, Aritz; Valencia-Gredilla, Francisco; Torra Farré, Joel (MDPI, 2020-04-01)The present work examines the effects of different integrated weed management (IWM) programs on multiple herbicide-resistant Papaver rhoeas populations in terms of effectiveness, profitability and carbon footprint. With ...
Growth environment but not seed position on the parent plant affect seed germination of two Thlaspi arvense L. populations Gesch, Russell W.; Royo-Esnal, Aritz; Edo-Tena, Eva; Recasens i Guinjuan, Jordi; Isbell, T.A.; Forcella, Frank (Elsevier, 2016)Thlaspi arvense L is a common weed found in most temperate regions throughout the world that also shows excellent potential for domestication as an oilseed crop. The complexity of T. arvense seed dormancy presently makes ...
Temperature and light requirements for germination and emergence of three arable Papaveraceae species Torra Farré, Joel; Royo-Esnal, Aritz; Recasens i Guinjuan, Jordi (2016)This research investigated the temperature and light requirements for seed germination and emergence patterns of pinnate poppy, violet horned-poppy, and nodding hypecoum, three annual Papaveraceae species found in arable ...