Temperature and Duration of Exposure on Chilling Injury of Safflower

D. Kereilwe, V. Emongor, Goitseone Malambane
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Abstract

Chilling injury is one of the major abiotic stresses which influence the production and quality of the most economically important crops of tropical and subtropical origin. Although safflower is cold tolerant, the level of tolerance significantly differs with phenological stages. This problem poses a major threat to safflower growers in countries with Mediterranean type of climate. Therefore, a study was undertaken to identify the low temperature and duration of exposure which causes chilling injury at blooming stage. The results showed that chilling incidence occurred when safflower plants were exposure to 0 and 4°C for duration of 8 and 12 hours. Plants exposure to 4°C for 8 hours did not develop chilling injury, however plants exposed to 0°C for 12 hours all suffered from chilling. Hence the lower the chilling temperature and the longer the length of exposure, the more the chilling occurrence and severity in safflower.
温度和暴露时间对红花冷害的影响
冷害是影响热带和亚热带重要经济作物生产和品质的主要非生物胁迫之一。红花虽然具有耐寒性,但耐寒程度随物候期的不同而有显著差异。这个问题对地中海型气候国家的红花种植者构成了重大威胁。为此,开展了一项研究,以确定引起花期冷害的低温和低温暴露时间。结果表明,当红花在0°C和4°C环境中暴露8和12小时时,发生了冷害。4°C低温处理8小时的植株未发生冷害,0°C低温处理12小时的植株均发生冷害。因此,低温温度越低,暴露时间越长,红花的冷害发生和严重程度越高。
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