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根际促生菌应用于基质对水稻幼苗生长的影响
戚秀秀, 魏 畅, 刘晓丹, 张林利, 姜 瑛, 张登晓
河南农业大学资源与环境学院
摘要:
为了研究根际促生菌对水稻幼苗的促生效果,培育高效优质水稻育苗基质,本研究选用5株根际促生菌(LY5:枯草芽孢杆菌(Bacillus subtilis),LY11:解淀粉芽孢杆菌(Bacillus amyloliquefaciens),X2:摩拉维亚假单胞菌(Pseudomonas moraviensis),X3:沙芬西芽孢杆菌(Bacillus safensis),X8:绿针假单胞菌(Pseudomonas chlororaphis)分别与本实验室已筛选出的最适配比基质进行混合制作高效水稻育苗基质,以不添加促生菌为对照,在盆栽条件下,研究根际促生菌对水稻幼苗生长和代谢的影响。结果表明:①解淀粉芽孢杆菌(LY11)应用于育苗基质对水稻幼苗的促生效果及代谢活性最好。②在育苗基质中添加根际促生菌后,地上部生物量和壮苗指数均比对照显著增加,增幅分别为17.24% ~ 31.19% 和11.37% ~ 23.28%。③添加根际促生菌的育苗基质能够促进水稻幼苗根系的生长,根体积、总根长等均比对照显著增加,且改善了根系形态结构,显著提高了根系活力。④根际促生菌处理显著促进了水稻幼苗对氮磷钾养分的吸收,且氮、钾的转运系数显著提高。⑤水稻幼苗体内谷氨酰胺合成酶和蔗糖磷酸合成酶活性在促生菌处理下均显著提高。因此,根际促生菌应用于水稻育苗基质能够促进秧苗的生长并提高其代谢活性,本研究结果能够为高效优质水稻育苗基质的研发提供理论支撑。
关键词:  水稻  根际促生菌  育苗基质  根系构型  代谢活性
DOI:10.13758/j.cnki.tr.2020.05.021
分类号:S511
基金项目:国家自然科学基金项目(41907079)、国家重点研发计划项目(2018YFD0200600)、国家重点研发计划重点专项(2017YFD 0200605)和河南省科技攻关计划(国际科技合作)项目(162102410031)资助。
Effects of Plant Growth-promoting Rhizobacteria Added in Seedling Substrate on Rice Growth
QI Xiuxiu, WEI Chang, LIU Xiaodan, ZHANG Linli, JIANG Ying, ZHANG Dengxiao
College of Resources and Environmental Science, Henan Agricultural University
Abstract:
A pot experiment was conducted to study the effect of plant growth-promoting rhizobacteria (PGPR) on rice growth after added into seeding substrate, in which five PGPR were selected, included LY5 (Bacillus subtilis), LY11 (Bacillus amyloliquefaciens), X2 (Pseudomonas moraviensis), X3 (Bacillus safensis) and X8 (Pseudomonas chlororaphis), and mixed with an efficient seedling substrate, respectively. The results showed that, compared with the CK (seedling substrate without PGPR added), LY11 was the best in promoting the growth and metabolic activity of rice seedlings, PGRP treatments significantly increased the aboveground biomass and strong seedlings index by 17.24%-31.19% and 11.37%-23.28%, respectively, significantly increased the volume, length and activity of rice roots and improved the morphology and structure of rice roots, significantly increased the uptake of nitrogen, phosphorus and potassium, the transport coefficients of nitrogen and potassium, and GS and SPS activities of rice seedlings. In conclusion, the application of PGPR to rice seedling substrate is benefit to the growth and activity of rice seedlings and can produce high quality rice seedling substrate.
Key words:  Rice  PGPR  Seedling substrate  Root architecture  Metabolic activity

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