Effects of NaCl stress on the growth and chlorophyll fluorescence characteristics of poplar seedlings
In order to understand the salt-tolerance of poplar, the seedlings of poplar cultivars Nanyang No. 1 and Nanyang No. 2 bred by the Jiangsu Provincial Key Laboratory of Marine Biology were taken as the test materials to study their dry weight, water potential, chlorophyll content, chlorophyll fluorescence parameters, and light energy absorption and distribution under the stress of different concentrations NaCl. At low concentration (75 mmol · L-1 ) NaCl, the plant dry weight, chlorophyll content, qP, Yield, and ETR of Nanyang .No. 1 were significantly lower than those of Nanyang No. 2. The decrement of the water potential of Nanyang No. 1 was higher than that of Nanyang No. 2, while the Fm/Fv and Fm'/Fv' of the two cultivars had less change. At high concentration (150 mmol · L-1) NaCl, there were no significant differences in the inhibitory effects of salt stress on Nanyang No. 1 and Nanyang No. 2. Under salt stress, Nanyang No. 2 had higher average value of Pc but lower proportion of Hd than Nanyang No. 1, while the average value of Ex of the two cultivars had little difference. Above all, due to the higher activity of photosystem II , Nanyang No. 2 had higher salt-tolerance than Nanyang No. 1.
NaCl stresspoplarchlorophyll fluorescence parameterlight energy absorption and distribution.
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