TY - JOUR
T1 - The influence of phosphorus on leaf function, cadmium accumulation and stress tolerance of poplar leaves under cadmium exposure
AU - Qiu, Wenwen
AU - Xu, Ting
AU - Li, Xiang
AU - Zhang, Yinyan
AU - Ren, Ruohan
AU - Heng, Qimeng
AU - Chen, Wenyi
AU - Zhang, Senyan
AU - Wang, Mengran
AU - Kou, Lili
AU - Jiang, Yuping
AU - Cui, Can
AU - Dou, Wenjie
AU - Li, Kunpeng
AU - Dong, Hao
AU - Zhang, Lijuan
AU - He, Haoran
AU - Chen, Yinglong
AU - Fan, Junfeng
AU - Zhang, Yi
N1 - Funding Information:
This project was financially supported by the National Key Research and Development Program of China (Grant No. 2021YFD2201200 ), the National Science Foundation of China ( 32171823 ), the Key R&D Program of Shaanxi Province (Grant No. 2020NY-055 ), and the Key R&D Program of Shaanxi Province (Grant No. 2020NY-120 ).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12
Y1 - 2022/12
N2 - A pot experiment was conducted to evaluate the effect of phosphorus (P) availability on leaf function, cadmium accumulation and stress tolerance of poplar leaves under cadmium exposure. The pot experiment consisted of two-factors including three Cd treatments and two P treatments, and a clone of Populus × euramericana was used as plant material. Leaf development and gas exchange were less inhibited by Cd exposure than that by P deficiency. Under different P levels, Cd accumulation increased with the increasing intensity and duration of Cd exposure, while Cd accumulation in leaves was inhibited by P deficiency. With sufficient P nutrition, Cd content and Cd concentration of leaves reached 300 μg plant−1 and 32 μg g−1 DW, respectively. Cd was preferentially enriched in leaf veins to avoid Cd poisoning in photosynthetic apparatus. In the absence of Cd exposure, P promoted WUEi via increasing photosynthesis rate. In contrast, P nutrition promoted WUEi under Cd exposure via regulating stomata aperture and reducing water loss via transpiration. The activities of antioxidants including GR and CAT were enhanced by P addition, as a result of the elevated expression of related genes (Gr chl, Gr cyt, Cat2, Cat3). The mechanisms underlying the promotive effect of P on leaf function and Cd tolerance are elucidated. Phosphorus promotes leaf function and Cd tolerance of poplar by enhancing photosynthetic process, stomatal regulation and antioxidant defense. Phosphorus shortage reduced the levels of phytohormones, while P addition contributes to stress tolerance via promoting the levels of phytohormones including ABA, JA and IAA. Salicylic acid (SA) promotes stress tolerance under Cd exposure via affecting the inducement of antioxidant enzymes. The improved Cd tolerance of leaves facilitates leaf carbohydrate production, promotes Cd bio-extraction and benefits xylem development of poplars growing under Cd exposure.
AB - A pot experiment was conducted to evaluate the effect of phosphorus (P) availability on leaf function, cadmium accumulation and stress tolerance of poplar leaves under cadmium exposure. The pot experiment consisted of two-factors including three Cd treatments and two P treatments, and a clone of Populus × euramericana was used as plant material. Leaf development and gas exchange were less inhibited by Cd exposure than that by P deficiency. Under different P levels, Cd accumulation increased with the increasing intensity and duration of Cd exposure, while Cd accumulation in leaves was inhibited by P deficiency. With sufficient P nutrition, Cd content and Cd concentration of leaves reached 300 μg plant−1 and 32 μg g−1 DW, respectively. Cd was preferentially enriched in leaf veins to avoid Cd poisoning in photosynthetic apparatus. In the absence of Cd exposure, P promoted WUEi via increasing photosynthesis rate. In contrast, P nutrition promoted WUEi under Cd exposure via regulating stomata aperture and reducing water loss via transpiration. The activities of antioxidants including GR and CAT were enhanced by P addition, as a result of the elevated expression of related genes (Gr chl, Gr cyt, Cat2, Cat3). The mechanisms underlying the promotive effect of P on leaf function and Cd tolerance are elucidated. Phosphorus promotes leaf function and Cd tolerance of poplar by enhancing photosynthetic process, stomatal regulation and antioxidant defense. Phosphorus shortage reduced the levels of phytohormones, while P addition contributes to stress tolerance via promoting the levels of phytohormones including ABA, JA and IAA. Salicylic acid (SA) promotes stress tolerance under Cd exposure via affecting the inducement of antioxidant enzymes. The improved Cd tolerance of leaves facilitates leaf carbohydrate production, promotes Cd bio-extraction and benefits xylem development of poplars growing under Cd exposure.
KW - Cadmium
KW - Leaf function
KW - Phosphorus
KW - Phytoremediation
KW - Poplar
UR - https://www.scopus.com/pages/publications/85139303354
U2 - 10.1016/j.envexpbot.2022.105087
DO - 10.1016/j.envexpbot.2022.105087
M3 - Article
AN - SCOPUS:85139303354
SN - 0098-8472
VL - 204
JO - Environmental and Experimental Botany
JF - Environmental and Experimental Botany
M1 - 105087
ER -
SDG 15 Life on Land