Phenology and reproductive biology of Avena ludoviciana in relation to combined heat and drought stress

The phenology and reproductive biology of four Avena ludoviciana biotypes were studied under 1) an ambient temperature treatment (23/12°C day/night) with 100% PAWC (control); 2) an elevated temperature treatment (29/23°C day/night) with 100% PAWC (heat stress); 3) an ambient temperature treatment (23/12°C day/night) with 60% PAWC water stress); and 4) an elevated temperature treatment with a 60% PAWC (combined heat and water stress). Seeds of the biotypes, Biloela 1 (−24.3547, 150.4977) and Biloela 2 (−24.3504, 150.4977) were collected from the northern zone, and Toobeah (−28.3679, 149.5219) and Jandowae (−26.6672, 151.0246) were collected from the southern zone of the Northern Grains Region of Australia. The study was conducted for two years at The University of Queensland Gatton campus.

本研究以4个卢多维克燕麦（Avena ludoviciana）生物型为对象，探究其物候学与生殖生物学特性，共设置4组处理：1）常温昼夜温度（昼23℃/夜12℃）结合100%植物有效含水量（PAWC，Plant Available Water Capacity）的对照组；2）高温昼夜温度（昼29℃/夜23℃）结合100% PAWC的热胁迫组；3）常温昼夜温度（昼23℃/夜12℃）结合60% PAWC的水分胁迫组；4）高温昼夜温度结合60% PAWC的温水复合胁迫组。供试生物型的种子分别采自澳大利亚北部谷物种植区：Biloela 1（坐标-24.3547, 150.4977）与Biloela 2（坐标-24.3504, 150.4977）采自该区域北部，Toobeah（坐标-28.3679, 149.5219）与Jandowae（坐标-26.6672, 151.0246）采自该区域南部。本实验于澳大利亚昆士兰大学加顿校区开展，实验周期为两年。