Effects of Cadmium Stress on Growth,Physiology and Biochemistry of Different Ploidy of Populus ussuriensis

doi:10.7525/j.issn.1673-5102.2020.05.011

Abstract

Abstract: The same year cutting seedlings of different ploidy of Populus ussuriensis Kom. were studied. They were treated with different concentrations of CdCl₂ solution, and the effects of different cadmium concentrations on the growth, physiology and biochemistry of three ploidy of P.ussuriensis were studied. The cadmium stress significantly inhibited the growth of the three ploidy seedlings. With the increase of cadmium concentration, the seedlings height and ground diameter decreased significantly compared with the control seedlings. The water content of diploid and tetraploid leaves showed a downward trend with the increase of cadmium concentration, while the water content of triploid leaves increased at low concentrations and decreased at high concentrations. The enzyme activities of catalase(CAT) and superoxide dismutase(SOD) in triploid and tetraploid increased when the cadmium concentration was low and decreased when the cadmium concentration was high, while the enzyme activity in the diploid showed a downward trend. These showed that the three types of ploidy had better tolerance when the concentration of cadmium was low. Under high cadmium concentration stress, the amounts of water content, chlorophyll content, CAT and MDA of the triploid were higher than these parameters of the tetraploid by 5.47%, 25.47%, 8.59% and 28.47%, respectively, and were higher than the diploid(CK) by 23.47%, 44.63%, 17.23% and 31.48%, respectively. All the above indicated that the triploid of P.ussuriensis had the least membrane damage and the strongest antioxidant capacity under cadmium stress, and had better resistance to heavy metal cadmium. This study could provide theoretical basis for breeding in heavy metal polluted areas.

Key words: Populus ussuriensis Kom. polyploid, cadmium stress, physiological indicators

CLC Number:

S792.113

SONG Zi-Wen, LIU Huan-Zhen, MA Xiao-Yu, SUN Guo-Yu, YI Jia-Xin, ZHANG Chun-Hua, YOU Yuan-Xiang, WANG De-Qiu, LI Kai-Long. Effects of Cadmium Stress on Growth,Physiology and Biochemistry of Different Ploidy of Populus ussuriensis[J]. Bulletin of Botanical Research, 2020, 40(5): 728-734.

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