| 引用本文: | 王一博,牛晓丽,代智光,等.局部灌水下6-BA对玉米幼苗生长和内源化学信号的影响[J].灌溉排水学报,2023,42(1):16-23. |
| WANG Yibo,NIU Xiaoli,DAI Zhiguang,et al.局部灌水下6-BA对玉米幼苗生长和内源化学信号的影响[J].灌溉排水学报,2023,42(1):16-23. |
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| 摘要: |
| 【目的】明确局部灌水下6-BA对玉米幼苗生长和内源化学信号的影响。【方法】设置了无水分胁迫对照处理（正常灌水，CK）、前期均匀供水后局部供水（局部亏水，PD）、前期均匀供水后局部供水+6-BA（PDT）、前期均匀水分胁迫后局部复水（局部复水，PR）、前期均匀水分胁迫后局部复水+6-BA（PRT）共5个处理，研究局部灌水下喷施6-BA对玉米生长指标和根系、茎部木质部汁液和叶片化学信号的影响。【结果】与CK相比，PD处理显著提高了玉米幼苗供水侧根系干质量、地上部干质量和叶面积，但不利于亏水侧根系干质量的增长，同时提高了叶片、供水侧根系和木质部汁液玉米素（ZA）、硝态氮（NO3-）和可溶性蛋白（Cpr）量，并降低了脱落酸（ABA）量；PR处理显著降低了玉米幼苗两侧根系干质量、地上部干质量和叶面积，另外降低了叶片、两侧根系和木质部汁液ZA、NO3-、Cpr量，并提高了ABA量。与PD、PR处理相比，PDT、PRT处理均提高了玉米幼苗两侧根系干质量、地上部干质量和叶面积以及不同生长部位ZA、NO3-、Cpr量，并降低了不同部位ABA量，有利于强化玉米整体的补偿生长。【结论】前期充分灌水后局部亏水处理更有利于刺激玉米的补偿生长，在局部灌水基础上额外喷施6-BA能够强化玉米幼苗整体的补偿生长效果，各化学信号对玉米生长发育调节作用不同。 |
| 关键词: 局部灌水；6-BA；生长指标；化学信号；补偿生长 |
| DOI：10.13522/j.cnki.ggps.2022163 |
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| Effects of 6-BA on Growth and Endogenous Chemical Signals of Maize Seedlings under Partial Irrigation |
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WANG Yibo, NIU Xiaoli, DAI Zhiguang, ZHAO Ben, MA Tiancheng, WANG Jiachen, WANG Zhihao
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1. Henan University of Science and Technology, Luoyang 471003, China;
2. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】The synthetic cytokinin 6-benzyladenine (6-BA) is an exogenous regulator to promote plant growth, and the purpose of this paper is to study the effect of 6-BA on growth of maize seedlings watered by different irrigations.【Method】We compared two irrigation treatments each having two 6-BA treatments (with and without adding 6-BA): partial water deficit irrigation following a uniform sufficient irrigation (PD for without 6-BA, and PDT for with 6-BA), and partial sufficient irrigation after a uniform deficit irrigation (PR for without 6-BA, PRT for with 6-BA). Sufficient irrigation without 6-BA addition was taken as the control (CK). In all treatments, the concentration of 6-BA was 10 mg/L. For each treatment, we measured the physiological traits of the crop. 【Result】Compared with CK, PD significantly increased dry root weight on the irrigated side, dry weight of the above-ground parts and the leaf area, but it did not have a noticeable impact on dry root weight on the not-irrigated side; it increased the contents of zeatin (ZA), nitrate nitrogen (NO3-) and soluble protein (Cpr) in the leaves, xylem sap and roots on the irrigated side, but reduced the content of abscisic acid (ABA). PR significantly reduced the weight of dry roots on both sides, weight of dry aboveground parts and leaf area, as well as the contents of ZA, NO3- and Cpr in leaves, xylem sap and roots on both sides, but it increased the content of ABA. Compared with PD and PR, PDT and PRT increased dry weight of the roots on both sides, dry weight of shoots and the leaf areas, as well as the contents of ZA, NO3- and Cpr in the plant, but reduced ABA thereby facilitating compensatory growth of the crop. 【Conclusion】Partial water deficit irrigation followed a sufficient uniform irrigation is optimal for maize seedling growth, and combined with praying 6-BA, it can further boost compensatory growth of the crop. |
| Key words: partial irrigation; 6-BA; growth index; chemical signal; compensatory growth |
