Alternate wetting and drying irrigation increases water and phosphorus use efficiency independent of substrate phosphorus status of vegetative rice plants.
Alternate wetting and drying irrigation increases water and phosphorus use efficiency independent of substrate phosphorus status of vegetative rice plants.
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DOI：
10.1016/j.plaphy.2020.06.017
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
J. Acosta-Motos;S. Rothwell;Margaret J Massam;A. Albacete;Hao Zhang;I. Dodd
中科院分区：
文献类型：
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作者：
J. Acosta-Motos;S. Rothwell;Margaret J Massam;A. Albacete;Hao Zhang;I. Dodd
为了提高作物资源的利用效率，需要采用较少灌溉和化肥的可持续水稻种植方法。干湿交替灌溉作为一种节水灌溉技术已得到广泛推广，但其与磷营养的相互作用却很少引起人们的关注。营养水稻植株在两种磷水平下生长，施肥（HP）或不施肥（LP），连续淹水（CF）或灌溉（awd）。本研究评估了处理对基质磷素生物利用度（通过薄膜扩散梯度- DGT-P测量）、植物与基质水分关系以及叶面植物激素状态的影响，同时评估了植物体内磷素的分配情况。不同灌溉处理下的茎部生物量和叶面积取决于基质磷状态（P与灌溉的交互作用显著），LP降低了这些变量，但对AWD的影响不显著。AWD维持了DGT-P浓度，增加了最大根长，但降低了根磷浓度和磷吸收量。基质干燥降低了气孔导度（gs）和叶片水势（Ψleaf），但增加了再淹。AWD提高了叶片脱落酸（ABA）、异戊基腺嘌呤（iP）和1-氨基环丙烷-1-羧酸（ACC）浓度，降低了反式玉米蛋白（tZ）和赤霉素A1 （GA1）浓度。低磷增加了ACC和茉莉酸（JA）浓度，降低了赤霉素A4 （GA4）浓度。在所有处理中，气孔导度与叶片ABA浓度呈负相关，与GA1浓度呈正相关。AWD处理下水稻植株茎部激素浓度的变化与水分和磷利用效率（WUE和PUE）的提高有关。
Sustainable approaches to rice cultivation that apply less irrigation and chemical fertilisers are required to increase crop resource use efficiency. Although alternate wetting and drying (AWD) has been widely promoted as a water-saving irrigation technique, its interactions with phosphorus (P) nutrition have attracted little attention. Vegetative rice plants were grown with two phosphorus levels, fertilised (HP)orun-fertilised (LP), and either continuous flooding (CF)orAWD irrigation. Treatment effects on substrate P bioavailability (measured by Diffusive Gradients in Thin films – DGT-P), plant and substrate water relations, and foliar phytohormone status, were assessed along with P partitioninginplanta. Shoot biomass and leaf area under different irrigation treatments depended on substrate P status (significant P x irrigation interaction), since LP decreased these variables under CF, but had no significant effect on plants grown under AWD. AWD maintained DGT-P concentrations and increased maximal root length, but decreased root P concentrations and P offtake. Substrate drying decreased stomatal conductance (gs) and leaf water potential (Ψleaf) but re-flooding increasedgs. AWD increased foliar abscisic acid (ABA), isopentenyl adenine (iP) and 1-aminocyclopropane-1-carboxylic acid (ACC) concentrations, but decreasedtrans-zeatin (tZ) and gibberellin A1 (GA1) concentrations. Low P increased ACC and jasmonic acid (JA) concentrations but decreased gibberellin A4 (GA4) concentrations. Across all treatments, stomatal conductance was negatively correlated with foliar ABA concentration but positively correlated with GA1 concentration. Changes in shoot phytohormone concentrations were associated with increased water and phosphorus use efficiency (WUE and PUE) of vegetative rice plants grown under AWD.