Impact of water supply on photosynthesis, water use and carbon isotope discrimination of sugar beet genotypes

Stomatal Behavior of Cowpea Genotypes Grown Under Varying Moisture Levels

“…δ 13 C, which provides an integration of the environmental conditions during the period of CO 2 assimilation [6], differed with moisture level. δ 13 C values were more negative under well-watered conditions compared to water-limited conditions, which corroborates the findings of many other studies on C 3 plants [13,27,28]. Less negative δ 13 C values under SD were attributed to lower 13 C discrimination due to the partial closure of the stomata occurring under soil drying.…”

“…In addition, stomata are generally known to be more open early in the season than at its end [22] hence the decrease of gs with DAP. Another interesting observation was the gs observed under WW in this study were relatively lower than those observed in intercropped sorghum and cowpea [23] and in sugar beet [13]. However, they were in the same range as those reported by [24] in cowpea and by [25] in wheat.…”

“…Thus, cowpea discriminated more against 13 C-CO 2 when soil moisture was more readily available compared to when the soil moisture was limited, resulting in more negative δ 13 C values being observed under well-watered conditions. In the first season, differences in leaf δ 13 Under WW, TV2 maintained a higher WUE biomass (in magnitude) followed by IT2, while TV1 had the lowest WUE biomass . Even though no genotypic differences were observed in the 2016, however in magnitude, TV1 consistently had the lowest WUE biomass under all moisture level.…”

“…Carbon isotope composition has also been shown to be related to WUE [12]. According to Bloch, Hoffmann [13], plants with a lower 13 C-CO 2 discrimination tend to be efficient water users. The advantage of measuring carbon isotope composition is that it provides an integrated measure of the plant's growing conditions as opposed to instantaneous measurements provided by gs measurements.…”

Effect of osmotic stress on growth and osmolytes accumulation in sugar beet (Beta vulgaris L.) plants

“…These results suggested that twomonth-old sugar beet plants display the drought tolerance to some extent, which can be due to increased ability for maintaining adequate water uptake by lateral root. There was also evidence that water deficit of leaf can inhibit the activity of photosystem II and the rate of CO 2 assimilation (Bloch et al 2006, Monti et al 2006), which in turn could decrease photosynthesis. Therefore, the growth of sugar beet plants inhibited by drought was probably associated with the reduction of photosynthesis rate, and loss of cellular turgor in leaf under osmotic stress.…”