Localized phosphorus promotes nutrient productivity of Brassica chinensis genotype with strong root morphological plasticity
文献类型: 外文期刊
第一作者: Gao, Wei
作者: Gao, Wei;Ruan, Yunze;Zhang, Deshan;Tang, Xiaoyan
作者机构:
关键词: Root morphology; Root exudation; Phosphorus (P); Localized P supply; Vegetable cropping system; Brassica chinensis
期刊名称:SCIENTIA HORTICULTURAE ( 影响因子:4.3; 五年影响因子:4.5 )
ISSN: 0304-4238
年卷期: 2023 年 310 卷
页码:
收录情况: SCI
摘要: Crops adjust root morphological and/or exudation traits in response to phosphorus (P) availability and localized P, governing crop productivity. However, how the intraspecific plasticity of root P-acquisition strategies influences plant adaptation to localized P fertilization across doses remains obscure. Root P-acquisition traits were assessed in Brassica chinensis L. Xiaqing and Yanchun grown in soil with four mineral P fertilization levels (0, 15, 24, and 30 kg P ha(-1)) and with broadcasted and localized P across two levels (15 and 24 kg P ha(-1)) to characterize efficient strategies in relation to large plant P productivity. The Xiaqing genotype stimulated the growth of roots with large specific lengths and increased the exudation of acid phosphatase and carboxylates under 15 kg P ha(-1) fertilization compared to those in 24 and 30 kg P ha(-1) soil. Conversely, Yanchun only increased root elongation in 15 kg P ha(-1) soil compared with crops in soil fertilized with 30 kg P ha(-1). Xiaqing and Yanchun stimulated local root growth in P-rich soil with 15 and 24 kg P ha(-1), but with longer roots in the former than the latter genotype. Localized P at the 15 kg P ha(-1) level, compared with 24 kg P ha(-1), increased root length density in the patchy soil zone and promoted P acquisition in Xiaqing and Yanchun. In conclusion, the Xiaqing genotype exhibited strong root plasticity in response to low and localized P application compared with the Yanchun genotype. Nutrient-efficient genotype coupling with localized fertilization is important to increase crop yield and save fertilizer in vegetable cropping systems.
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