ABSTRACT

Little is known about actual temperature regimes experienced by potato during the critical period of tuber bulking and their impact on plant and tuber growth outside the cool temperate production regions. We analysed the temperature data of potato growing regions in Western Australia (WA) and six other non-traditional potato growing regions for the number of days with maximum temperatures above 25, 30 or 35°C and their occurrence during tuber bulking. As anticipated, days with 25°C increased between 1985 and 2014 in all locations in WA. Surprisingly, across the other six locations, only Beersheba (Israel) showed a significant trend of increasing temperatures. Then, in a greenhouse experiment, we investigated how 1, 3, 6 and 9 days of 30°C applied shortly after tuber initiation influenced plant and tuber growth of potato cv. Royal Blue. Tuber mass and leaf area decreased linearly with increased duration of 30°C. In conclusion, potato grown in WA and other locations already experience growth limiting temperatures during tuber bulking and the frequency of hot days is increasing. Considering climate change and the expansion of potato production into non-traditional areas, more detailed examination of temperature regimes in other warm growing regions could be important for industry planning.

摘要

关于马铃薯在块茎膨大关键时期所经历的实际温度状况及其对冷温带产区以外的植物和块茎生长的影响知之甚少。我们分析了西澳大利亚（WA）马铃薯种植区和其他六个非传统马铃薯种植区的最高温度高于 25、30 或 35°C 的天数及其在块茎膨化期间的发生情况。正如预期的那样，1985 年至 2014 年间，西澳所有地区气温为 25°C 的天数都增加了。令人惊讶的是，在其他六个地点，只有贝尔谢巴（以色列）表现出明显的气温升高趋势。然后，在温室实验中，我们研究了在块茎萌生后不久应用 30°C 的 1、3、6 和 9 天如何影响马铃薯品种的植物和块茎生长。宝蓝色。块茎质量和叶面积随着 30°C 持续时间的增加呈线性下降。总之，在西澳和其他地区种植的马铃薯在块茎膨化期间已经经历了生长限制温度，并且炎热天气的频率正在增加。考虑到气候变化和马铃薯生产向非传统地区的扩张，更详细地检查其他温暖种植区的温度状况对于行业规划可能很重要。