CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2022, Vol. 44 ›› Issue (5): 1048-1056.doi: 10.19802/j.issn.1007-9084.2021215

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Effect of water stress in different phases on photosynthetic characteristics of drought-avoidant soybean

Chun-juan YAN1(), Shu-hong SONG1, Chang-ling WANG1, Xu-gang SUN1, Yong-qiang CAO1, Li-jun ZHANG1, Li ZHANG1, Xiao-yang HUO2, Wen-bin WANG1()   

  1. 1.Crop Institute of Liaoning Academy of Agricultural Science, Shenyang 110161, China
    2.R&D Service Center of Shenyang Modern Agriculture, Shenyang 110034, China
  • Received:2021-08-18 Online:2022-10-25 Published:2022-10-31
  • Contact: Wen-bin WANG E-mail:yanchunjuan1983@163.com;wbwang@163.com


Drought is one of the major natural disasters that limit the formation of soybean yield. Application of drought-avoidant varieties is an effective way to alleviate the loss of soybean yield under drought stress. Drought avoidance resistance refers to the ability of plants to maintain high water potential under drought stress. To better understand the mechanism of drought avoidance, two soybean hybrids with contrasting drought avoidance, Liaodou 14 (drought-avoidant) and Liaodou 21 (drought-sensitive) under water stress were evaluated, in order to reveal the photosynthetic regulation mechanism of drought-avoidant genotype soybean. The results showed that water control in each period and soil moisture significantly affected the net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) of soybean plants. Drought limited the plant’s Pn, Tr, Gs, and intercellular CO2 concentration (Ci). In general, the average Tr of Liaodou 21 was higher than that of Liaodou 14. With the increase in soil water content, the intercellular CO2 concentration of plants generally gradually increased. The initial fluorescence (F0 ) value of soil drought (W1) treatment was higher than other water treatments. The F0 value was the lowest when the water was controlled at pod stage (R3-R5). Drought stress reduced the maximum photochemical efficiency (Fv/Fm), electrons transport rate (ETR) and actual photochemical efficiency (ΦPSⅡ ) of plants. When soil moisture was controlled at the same stage, the maximum fluorescence yield (Fm) and Fv/Fm of Liaodou 14 were higher than those of Liaodou 21. On the drought stress condition, Liaodou 14 can maintain a lower transpiration rate and higher Fm and Fv/Fm value than that of Liaodou 21. This could be an important photosynthetic factor for drought-avoidant genotype to resist drought stress.

Key words: soybean, water stress, drought- avoidant variety, photosynthesis characteristics

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