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Li G.L.,Inner Mongolia Agricultural University | Wu H.X.,Inner Mongolia Research Institute for Water Conservancy | Sun Y.Q.,Inner Mongolia Agricultural University | Zhang S.Y.,Inner Mongolia Agricultural University
Russian Journal of Plant Physiology | Year: 2013

We compared the parameters of chlorophyll fluorescence between two sugar beet (Beta vulgaris L.) species differing in drought tolerance. Our results indicated that there were different responses to the drought stress of these sugar beet species. In drought-tolerant sugar beet, the F0 increased slightly, while qN increased substantially, indicating that these plants can protect PSII reaction centers from the damage. Fv/Fm and qP decreased slightly during the initial period of drought stress; this suggests that there is a slight impact of drought stress on the openness of PSII reaction centers, and thus the plants did not suffer seriously. This was further shown by the decreased Yield and electron transfer rate. The parameters of chlorophyll fluorescence were stable and can be used as an important indicator for sugar beet seedlings in the early drought tolerance. © 2013 Pleiades Publishing, Ltd.

Li G.,Inner Mongolia Agricultural University | Wu H.,Inner Mongolia Research Institute for Water Conservancy | Sun Y.,Inner Mongolia Agricultural University | Zhang S.,Inner Mongolia Agricultural University
Sugar Tech | Year: 2015

Many plants accumulate betaine in response to water stress. The betaine aldehyde dehydrogenase (BADH) is the key enzyme in betaine biosynthesis in plants and can be regulated by BADH gene. A pot experiment was conducted to compare the relation of betaine content and BADH gene expression in two sugarbeet (Beta vulgaris L.) varieties differing in drought tolerance. We observed an evident correlation between the transcript up-regulation and the betaine accumulation under water stress. Results showed that the betaine content and BADH gene expression in the drought tolerant variety, was significantly increased under drought stress. The betaine accumulation and BADH gene expression might function as one response to eliminate the negative effects of drought and may play a critical role in maintaining photosynthetic activity in sugarbeet plants under water stress. © 2015 Society for Sugar Research & Promotion

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