Drought Induced Changes in Growth, Osmolyte Accumulation and Antioxidant Metabolism of Three Maize Hybrids.
Drought Induced Changes in Growth, Osmolyte Accumulation and Antioxidant Metabolism of Three Maize Hybrids.
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DOI：
10.3389/fpls.2017.00069
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发表时间：
2017
影响因子：
5.6
通讯作者：
Wang LC
中科院分区：
文献类型：
--
作者：
Anjum SA;Ashraf U;Tanveer M;Khan I;Hussain S;Shahzad B;Zohaib A;Abbas F;Saleem MF;Ali I;Wang LC
在气候变化的情况下，作物生产系统中干旱胁迫的后果可能比其他非生物胁迫更有害。植物在干旱胁迫下生理生化反应的变化规律可作为耐旱性的分子标记用于植物的选择和育种。本研究旨在评价3个不同玉米杂交种（东单80、皖单13和润农35）在充分供水、低水、中水和干旱条件下的表现，分别保持100、80、60和40%的田间持水量。与充分灌溉条件相比，干旱胁迫通过产生过量的活性氧（ROS）引起氧化胁迫，导致所有玉米杂交种的生长和产量形成降低;然而，干旱胁迫的负面影响在润农35中更为突出。干旱诱导的渗透调节物质积累和强的酶和非酶防御系统阻止了冬单80的严重伤害。干旱胁迫下各玉米杂交种的综合表现为：冬单80 >皖单13 >润农35，减产率分别为6.39%、7.35%和16.55%。因此，这些生化性状和差异的生理反应可能有助于开发耐旱基因型，可以承受水分亏缺条件下最小的产量损失。
Consequences of drought stress in crop production systems are perhaps more deleterious than other abiotic stresses under changing climatic scenarios. Regulations of physio-biochemical responses of plants under drought stress can be used as markers for drought stress tolerance in selection and breeding. The present study was conducted to appraise the performance of three different maize hybrids (Dong Dan 80, Wan Dan 13, and Run Nong 35) under well-watered, low, moderate and SD conditions maintained at 100, 80, 60, and 40% of field capacity, respectively. Compared with well-watered conditions, drought stress caused oxidative stress by excessive production of reactive oxygen species (ROS) which led to reduced growth and yield formation in all maize hybrids; nevertheless, negative effects of drought stress were more prominent in Run Nong 35. Drought-induced osmolyte accumulation and strong enzymatic and non-enzymatic defense systems prevented the severe damage in Dong Dan 80. Overall performance of all maize hybrids under drought stress was recorded as: Dong Dan 80 > Wan Dan 13 > Run Nong 35 with 6.39, 7.35, and 16.55% yield reductions. Consequently, these biochemical traits and differential physiological responses might be helpful to develop drought tolerance genotypes that can withstand water-deficit conditions with minimum yield losses.