ABSTRACT

Potato (Solanum tuberosum L.) under Mediterranean climate may be affected by internal brown spot, non-pathogenic disorder of flesh tissues leading to a dramatic depreciation of tubers. Its aetiology is still clarifying; however, some abiotic stressors, such as the high temperatures, heat and drought are noticed as crucial factors exacerbating the physiological decline. With the aim of escaping the potato growth stages most prone to the physiopathy, shortening cropping cycle by KCl-induced potato canopy desiccation was experimented on two field trials. Experimental field treatments were two consecutive KCl foliar applications, respectively at thirty and twenty days before harvesting, at 113 and 75 g L⁻¹, that were compared to the water-sprayed control. Salt solution spraying injured above-ground parts ending potato’s growth early reducing incidence of tuber internal browning, on average, between 30% and 50% at low and high KCl concentration, respectively. The non-sensitive cultivar Agria proved the most productive, whereas Ricciona di Napoli resulted strongly defected by the physiopathy. Under low-irrigation regime, IBS occurrence was reduced of about 39%. The reduction of the transpiration flow and growth cycle likely decreased internal brown spot under KCl vine desiccation, as well as the role of KCl on tuber ripening dynamics cannot be overlooked.

摘要

地中海气候下的马铃薯（Solanum tuberosum L.）可能受内部褐斑，非致病性肉体组织紊乱的影响，导致块茎急剧下降。其病因仍在澄清。但是，人们注意到一些非生物胁迫源，例如高温，高温和干旱是加剧生理衰退的关键因素。为了逃避最容易发生生理病害的马铃薯生长阶段，在两个田间试验中试验了通过氯化钾诱导的马铃薯冠层干燥缩短了种植周期。实验田间处理是分别在收获前三十天和二十天分别以113和75 g L ^-1连续施用两次KCl叶面，将其与喷水对照进行比较。用盐溶液喷洒受伤的地上部分，可以使马铃薯的生长提前结束，从而降低块茎内部褐变的发生率，在低和高KCl浓度下，平均分别降低30％至50％。不敏感的品种Agria被证明是最有生产力的，而Ricciona di Napoli则因生理疾病而严重缺损。在低灌溉条件下，IBS的发生减少了约39％。蒸腾流量和生长周期的减少可能会降低KCl藤干条件下内部褐斑的发生，以及KCl在块茎成熟动力学上的作用也不容忽视。