Biophysical Phenomics: Evaluation of the Impact of Mycorrhization with Piriformospora indica

Influence of the root endophyte Piriformospora indica on the plant water relations, gas exchange and growth of Chenopodium quinoa at limited water availability

“…Another aspect that deserves further comment is that ETR max /A gross ratio of inoculated plants was lower, particularly under strained water conditions (Table 3), indicative of a lower potential for ROS accumulation in these plants compared to mock-treated ones. These results concur with several earlier studies, which have shown that mutualistic interaction with P. indica could improve gas exchange capacity of the host plants, minimize the harmful impact of stress on their photosynthetic concert and alter their metabolism to preserve the photosynthetic machinery against ROS production and consequently enhances their drought resistance (Kumar et al, 2009;Trivedi et al 2014b;Tsimilli-Michael & Strasser, 2013;Xu et al, 2016).…”

Special issue in honour of Prof. Reto J. Strasser - Revisiting JIP-test: An educative review on concepts, assumptions, approximations, definitions and terminology

“…The JIP-test was also extended to include the following ways for the comparison of a stressed sample with the nonstressed (control), with respect to the events reflected in the OJ, OI, JI, and IP phases (Strasser et al 2004(Strasser et al , 2007Tsimilli-Michael and Strasser 2013b (Strasser et al 2007). Hence, these subtractions provide a simple semiquantitative way to visualise the impact of stress; however, they should not be considered as providing additional information to those derived from the calculated parameters.…”

“…The difference kinetics ∆W(OJ),t reveals the K-band, denoted so because its peak is at ∼ 300 µs, where the K-step appears in the OKJIP transient (Strasser et al 2004); moreover, when the above data processing was first introduced and this band was detected, it was attributed, like the K-step, to an inactivation of OEC that, if minor, would not be recognised in the raw fluorescence transient (see subsection 'The K-step'). The K-band may also result from a bigger, compared to the control sample, functional PSII antenna size resulting in a steeper OJ rise (Yusuf et al 2010, Tsimilli-Michael andStrasser 2013b). However, OEC inactivation results also in a lower P-step, while a bigger functional antenna does not affect it; this can be used as a criterion for deducing which of the two is reflected in the K-band, without excluding the possibility that they coexist, with a relative contribution that depends on stress severity.…”

“…It is powerful, by rapidly screening thousands of samples, for comparison and detection of stress effects; there are hundreds of publications on heat/drought/salinity/lightintensity/heavy-metals-contamination effects (that could not be cited here, given the aim of the review and the limited space available). There are also many publications on the detection and early diagnosis of beneficial effects, like those caused by mycorrhization (e.g., Strasser et al 2007, Tsimilli-Michael and Strasser 2008b, 2013b. It can also provide access to mechanisms, but cannot go further to elucidate them if it is not used together with other types of measurements, e.g., of physiological parameters, chlorophyll content, gas-exchange data, modulated reflection at 820 nm.…”

The effect of ozone and drought on the photosynthetic performance of canola

“…The transients in leaves were induced by red light (peak at 650 nm) of 3 000 μmol photons m −2 s −1 provided by an array of three light-emitting diodes, and recorded for 1 s with 12 bit resolution. The data acquisition was at every 10 μs (from 10 μs to 0.3 ms), every 0.1 ms (from 0.3 to 3 ms), every 1 ms (from 3 to 30 ms), every 10 ms (from 30 to 300 ms) and every 100 ms (from 300 ms to 1 s) (Strasser et al 2004;Tsimilli-Michael and Strasser 2013). The first reliable data are considered to be at 10 μs.…”