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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