文献类型： 外文期刊

作者： Ruan, Li ¹ ; Cheng, Hao ³ ; Ludewig, Uwe ⁴ ; Li, Jianwu ¹ ; Chang, Scott X. ¹ ;

作者机构： 1.Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Sericulture & Tea, Hangzhou 310021, Peoples R China

3.Chinese Acad Agr Sci, Natl Ctr Tea Improvement, Tea Res Inst, Hangzhou 310008, Peoples R China

4.Univ Hohenheim, Inst Crop Sci, Nutr Crop Physiol, Fruwirthstr 20, D-70593 Stuttgart, Germany

5.Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada

关键词： cellulose decomposition; F1 hybrid population; low-K tolerant; organic acids; root development

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 15 期

页码：

收录情况： SCI

摘要： Root foraging enables plants to obtain more soil nutrients in a constantly changing nutrient environment. Little is known about the adaptation mechanism of adventitious roots of plants dominated by asexual reproduction (such as tea plants) to soil potassium heterogeneity. We investigated root foraging strategies for K by two tea plants (low-K tolerant genotype "1511" and low-K intolerant genotype "1601") using a multi-layer split-root system. Root exudates, root architecture and transcriptional responses to K heterogeneity were analyzed by HPLC, WinRHIZO and RNA-seq. With the higher leaf K concentrations and K biological utilization indexes, "1511" acclimated to K heterogeneity better than "1601". For "1511", maximum total root length and fine root length proportion appeared on the K-enriched side; the solubilization of soil K reached the maximum on the low-K side, which was consistent with the amount of organic acids released through root exudation. The cellulose decomposition genes that were abundant on the K-enriched side may have promoted root proliferation for "1511". This did not happen in "1601". The low-K tolerant tea genotype "1511" was better at acclimating to K heterogeneity, which was due to a smart root foraging strategy: more roots (especially fine roots) were developed in the K-enriched side; more organic acids were secreted in the low-K side to activate soil K and the root proliferation in the K-enriched side might be due to cellulose decomposition. The present research provides a practical basis for a better understanding of the adaptation strategies of clonal woody plants to soil nutrient availability.