Growth and physiological changes of walnut seedlings under different nutrient deficiency conditions

Huang Xiaohui; Wu Jiaojiao; Wei Liben; Wang Yushu; Feng Dalan; Zhang Hong

doi:10.12171/j.1000-1522.20220024

Journal of Beijing Forestry University > 2023 > 45(9): 33-41. > DOI: 10.12171/j.1000-1522.20220024

Huang Xiaohui, Wu Jiaojiao, Wei Liben, Wang Yushu, Feng Dalan, Zhang Hong. Growth and physiological changes of walnut seedlings under different nutrient deficiency conditions[J]. Journal of Beijing Forestry University, 2023, 45(9): 33-41. DOI: 10.12171/j.1000-1522.20220024

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Growth and physiological changes of walnut seedlings under different nutrient deficiency conditions

1.
Chongqing Academy of Forestry, Chongqing Key Laboratory of the Three Gorges StorehouseDistrict Forest Ecology Protects and Restores, Chongqing 400036, China
2.
College of Forestry, Sichuan Agricultural University, Chengdu 611130, Sichuan, China

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Received Date: January 12, 2022
Revised Date: March 21, 2022
Accepted Date: June 13, 2023
Available Online: June 14, 2023
Published Date: September 24, 2023

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Abstract

Abstract

Objective This paper studies the phenotypic characteristics, growth and physiological characteristics of walnut seedlings under different nutrient deficiency conditions, so as to provide a theoretical basis for scientific and efficient management of walnut seedlings.
Method Pot experiment was conducted to study the phenotypic characteristics and growth physiological changes of walnut seedlings deficient in N, P, K, Ca and Mg.
Result (1) The leaf symptoms and occurrence time of walnut seedlings with different element deficiency treatments were different. Among them, the symptom of N deficiency appeared the earliest, Mg deficiency followed, and K deficiency appeared the latest. The aboveground biomass of seedlings lacking N and Mg decreased by 66.5% and 48.6%, respectively compared with CK, and root biomass decreased by 48.0% and 55.0%, respectively compared with CK; (2) The photosynthetic pigment content, net photosynthetic rate and stomatal conductance of walnut seedlings treated with element deficiency were significantly lower than those of CK. Among them, the photosynthetic pigment content of seedlings lacking N and Mg decreased the most, and the net photosynthetic rate and stomatal conductance of walnut seedlings lacking Ca and Mg decreased the most; (3) The chlorophyll fluorescence parameters of walnut seedlings treated with element deficiency showed significant differences, but in general, the chlorophyll fluorescence parameters of each element deficiency treatment were different. The values of Φ_PSII, ETR, F_v/F_mand qP were significantly lower than those of CK, and the value of NPQ was significantly higher than that of CK, among which the change of P-deficient treatment was the most obvious; (4) The contents of IAA and ABA in walnut seedlings treated with element deficiency were significantly higher than those of CK, while the contents of Spm and Spd were significantly lower than those of CK, especially in N deficiency treatment.
Conclusion Element deficiency has certain effects on photosynthetic efficiency and endogenous hormones of seedlings, and the effects of N deficiency, Mg deficiency and Ca deficiency are the most obvious. Therefore, in the management of walnut seedlings, we should pay attention to the observation of seedling growth, diagnose and identify the deficiency of elements as soon as possible, especially N, Ca and Mg elements that are easy to appear and have obvious symptoms, and supplement them in time, so as to improve the seedling quality of walnut.
- walunt,
- nutrient deficiency,
- photosynthetic efficiency,
- hormone metabolism,
- physiological change

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Growth and physiological changes of walnut seedlings under different nutrient deficiency conditions

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