International Institutes for Earth System Science, Nanjing University, Nanjing 210023, China.
Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 200023, China.
Int J Environ Res Public Health. 2018 Apr 24;15(5):839. doi: 10.3390/ijerph15050839.
Drought has been one of the most important limiting factors for crop production, which deleteriously affects food security worldwide. The main objective of the present study was to quantitatively assess the effect of drought on the agronomic traits (e.g., plant height, biomass, yield, and yield components) of rice and wheat in combination with several moderators (e.g., drought stress intensity, rooting environment, and growth stage) using a meta-analysis study. The database was created from 55 published studies on rice and 60 published studies on wheat. The results demonstrated that drought decreased the agronomic traits differently between rice and wheat among varying growth stages. Wheat and rice yields decreased by 27.5% and 25.4%, respectively. Wheat grown in pots showed greater decreases in agronomic traits than those grown in the field. Rice showed opposite growing patterns when compared to wheat in rooting environments. The effect of drought on rice increased with plant growth and drought had larger detrimental influences during the reproductive phase (e.g., blooming stage, filling stage, and maturity). However, an exception was found in wheat, which had similar decreased performance during the complete growth cycle. Based on these results, future droughts could produce lower yields of rice and wheat when compared to the current drought.
干旱是影响作物生产的最重要限制因素之一，对全球粮食安全造成了不利影响。本研究的主要目的是使用荟萃分析研究定量评估干旱对水稻和小麦农艺性状（例如株高、生物量、产量和产量构成因素）的影响，并结合几种调节剂（例如干旱胁迫强度、根系环境和生长阶段）。该数据库是由 55 项关于水稻的已发表研究和 60 项关于小麦的已发表研究创建的。结果表明，干旱对不同生长阶段不同品种的水稻和小麦的农艺性状的影响不同。小麦和水稻的产量分别下降了 27.5%和 25.4%。与在田间生长的小麦相比，在盆中生长的小麦农艺性状下降幅度更大。与小麦相比，在根系环境中，水稻表现出相反的生长模式。随着植物生长，干旱对水稻的影响增加，在生殖阶段（例如开花期、灌浆期和成熟期）干旱对产量的负面影响更大。然而，在小麦中发现了一个例外，即在整个生长周期中，小麦的性能下降相似。基于这些结果，与当前干旱相比，未来干旱可能会导致水稻和小麦的产量降低。
