Effects of drought stresson chlorophyll fluorescence properties and seedling growth of quinoa seedlings
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DOI:10.7606/j.issn.1000-7601.2019.04.23
Key Words: quinoa  seedling growth  drought stress  chlorophyll fluorescence  chlorophyll content
Author NameAffiliation
LIU Wen-yu Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China 
YANG Fa-rong Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China 
HUANG Jie Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China 
WEI Yu-ming Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China 
LI Jian-rong Ningxia Agricultural Technology Extension Station, Yinchuan, Ningxia 750001, China 
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Abstract:
      Using quinoa varieties Longli No.1, No.2, No.3, No.4 and Baili seedlings as experimental materials, we conducteda pot experiment with a set of different degreesof drought stress.After 15 days, plant height, root length, biomass, leaf chlorophyll contents, Fo, Fm, Fv/Fm, Fv/Fo, and other indexes were determined to study the effects of drought stress on chlorophyll fluorescence properties and seedling growth. The results showed that: (1) with aggravation of drought stress, plant height, aboveground fresh weight, and dryweight decreased compared with CK. The plant height of five quinoa varieties decreased by 30.64%、28.36%、32.67%、37.88%, and 38.09%, respectively, under SD treatment.The aboveground fresh weight decreased by 63.60%,6073%, 59.74%,55.92%, and 61.74%, respectively, and the aboveground dry weight decreased by 62.96%,52.63%, 29.41%, 35.71%and 60.00%, respectively. Root length, underground fresh weight,and drought weight increased and then decreased. (2) The contents of chlorophyll a, chlorophyll b, chlorophyll, and chlorophyll a/b of five different quinoa varieties seedlings increased and then decreased, unde SD treatment, the contents of chl a in quinoa variety of ‘L-2’,‘L-3’ and ‘L-4’ were decreased 28.48%,33.66% and 17.99%, the contents of chl b were decreased 47.80%,45.08% and 13.90%, the chl contents were decreased 33.22%,36.20% and 15.99. (3) With aggravation of drought stress, FoFm Fv/Fm and Fv/Fo of quinoa seedlings leaves decreased compared with CK, Fo decreased by 30.61%,14.56%,31.28%,24.39%,24.16% and Fm decreased 19.11%,16.56%,16.76%,17.67%,22.19% under SD treatment,respectively. Fv/Fm and Fv/Fo of different quinoa varieties were also decreased with the aggravation of drought stress, compared with CK, Fv/Fm and Fv/Fo decreased by 5.73%,4.29%,7.81%,4.58%,3.85% and 19.40%,14.93%,24.02%,11.34%,12.11%under SD treatments, respectively. (4) NPQ of different quinoa varieties increased compared with CK.It increased by 74.79%,161.54%,104.55%,200.00%, and 196.00%under SD treatments,respectively. In conclusion, because chloroplast was damaged, chlorophyll biosynthesis was inhibited and photosynthetic yield reduced, seedling growth was inhibited and aboveground biomass decreased. In aspects of seedling growth and chlorophyll fluorescence properties in seedling leaves of different quinoa varieties, the performance [JP3]of quinoa variety L-2 was better than other varieties, so indicated that Longli No.2 had a stronger ability to adapt the drought stress.
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