Effects of drought stress on photosynthesis and chlorophyll fluorescence images of soybean (Glycine max) seedlings

Abstract

The main purpose of this research is to provide a theoretical foundation for the screening of drought-resistant soybean varieties and to establish an efficient method to detect the PSII actual photochemical quantum yields efficiently. Three soybean varieties were compared in this experiment after 15 d when they were planted in a greenhouse. These varieties were then exposed to light drought stress (LD) and serious drought stress (SD) conditions. With five times' measurement, chlorophyll fluorescence and soil-plant analysis development considered as the main basis for this study. Several parameters in SD conditions significantly reduced, such as net photosynthetic rates (Pn), stomatal conductance (Gs), PSII primary light energy conversion efficiency (Fv/FM), PSII actual photochemical quantum yields [Y(II)], photochemical quenching coefficient (qP) and non-photochemical quenching coefficient (qN). The soybeans in the seedling stage adapted to the inhibitory effect of drought stress on photosynthesis through stomatal limitation. Under serious drought stress, non-stomatal limitation damaged the plant photosynthetic system. The amplitudes of Pn and Y(II) of drought-resistant Qihuang 35 were lower than those of the two other varieties. Based on the data of this study, a new method had been developed to detect Y (II) which reflected the photosynthetic capacity of plant, R=0.85989, u=0.048803 when using multiple linear regression, and R=0.84285, u=0.054739 when using partial least square regression. of drought stress on photosynthesis and chlorophyll fluorescence images of soybean (Glycine max) seedlings. Int J Agric & Biol Eng, 2018; 11(2): 196-201.

Peer Review #1 of "Drought stress strengthens the link between chlorophyll fluorescence parameters and photosynthetic traits (v0.1)"

“…The strengthening relationship between A n and ChlF ratio has been observed in previous studies (Murchie & Lawson 2013;Su et al 2015). For example, Wang et al (2018) found a significant linear relationship between A n and F v /F m in the soybean experiment under drought conditions. Batra et al (2014) found similar results by studying the ChlF ratio characteristics of mung beans under drought conditions.…”

Foliar application of urea and potassium chloride minimizes terminal moisture stress in lentil (Lens culinaris L.) crop

“…Drought stress causes drastic reduction in leaf chlorophyll content, affecting the photosynthetic efficiency of plants, reducing dry matter accumulation and poor grain yield (Wang et al, 2018). In this study, a significant increase (p < 0.05) in plant height, number of branches per plant, number of pods per plant and biomass as well as seed yield with agrochemical application as compared to control was observed.…”

The Physiological responses of four soybean varieties and their effect to the yield in several saturated soil culture modification

“…The lack of water could impede the plant growth because water has so many functions for photosynthesis, nutrient and plant assimilates distribution. The decline of photosynthesis in drought-stressed the plant is associated with the stomata restriction (Wang et al 2018) lead to the limitation of carbon assimilation and finally reduce soybean pod production (Stolf et al 2009).…”