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首页> 外文期刊>Plant Breeding and Seed Science >Sensitivity of ‘Monika’ Cucumis sativus seedlings to low temperature and induction of chilling tolerance
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Sensitivity of ‘Monika’ Cucumis sativus seedlings to low temperature and induction of chilling tolerance

机译：'Monika'Cucumis sativus 幼苗对低温的敏感性和耐寒性

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The aim of the research was to investigate the chilling sensitivity of cucumber seedlings and to alleviate its negative effects by short-term shock temperature applied during seeds imbibition, before radicle protrusion. The chilling sensitivity was investigated depending on initial root length (1, 3, 5 and 7 mm) and duration of chilling exposure (0, 1, 3, 7, 14, 21 days) at 0°C and was evaluated by measurements of roots and hypocotyls growth, electrolyte leakage and dehydrogenases activity. To assess whether short-term shock temperature applied before radicle protrusion can increase chilling tolerance in cucumber seedlings the seeds were imbibed at 25°C for 16 h, exposed to temperatures of 0; 2,5; 5; 35; 40, 45°C for 0; 0,5; 1; 2; 4 h.The obtained results indicated that cucumber seedlings sensitivity depended on duration of chilling expo-sure and initial root length during which the seedlings were subjected to these conditions. Chilling sensitivity were manifested by drop in the roots and hypocotyls elongation, reduction in dehydrogenases activity and membrane integrity expressed by electrolyte leakage. Seedlings with 1 mm roots was relatively tolerant to 3 days of chilling at 0°C. Their chilling sensitivity increased as roots elongated. Seedling with 3, 5, 7 mm of roots subjected to chilling suffered a subsequent 71, 75 and 81% of growth inhibition, respectively.The presented results showed that a short-term of low (0; 2,5 or 5°C) or high (35; 40 or 45°C) temperature treatments applied before radicle protrusion i.e. after 16 h of seeds imbibition significantly counteracted the negative effects of chilling on seedlings. The best results expressed by increased length and the number of roots were obtained when imbibed seeds were exposed to 45°C for 2 and 4 h. The increased chilling tolerance of cucumber seedlings induced as early as at the stage of seed imbibition, before radicle protrusion indicates on the possibility of application of this method in practice. The positive response of such treatment on cucumber chilling tolerance are discussed.
机译：该研究的目的是研究黄瓜幼苗的冷敏性，并通过在胚根突出之前在种子吸收过程中施加的短期休克温度减轻黄瓜幼苗的冷害。根据初始根部长度（1、3、5和7 mm）和在0°C下的暴露于冷害的持续时间（0、1、3、7、14、21天）研究冷敏性，并通过测量根部进行评估和下胚轴生长，电解质泄漏和脱氢酶活性。为了评估在胚根伸出之前施加的短期休克温度是否可以提高黄瓜幼苗的耐寒性，将种子在25°C的温度0下吸收16 h; 2,5; 5; 35; 40，45°C为0; 0,5; 1; 2; 4 h。所得结果表明，黄瓜幼苗的敏感性取决于低温暴露的持续时间和幼苗在这些条件下的初始根长。根部下降和下胚轴伸长，脱氢酶活性降低和电解质渗漏表示的膜完整性表现出对低温的敏感性。根为1毫米的幼苗在0°C的寒冷条件下可耐受3天。随着根的伸长，它们的寒冷敏感性增加。根部3、5、7毫米的幼苗受冷后分别遭受71％，75％和81％的生长抑制，结果表明短期处于低温（0; 2,5或5°C）在胚根突出之前（即种子吸水16小时后）或高温（35; 40或45°C）处理可显着抵消冷藏对幼苗的不利影响。当将吸收的种子暴露于45°C 2和4 h时，获得最佳的结果，即增加的长度和根的数量。早在种子吸收阶段，在胚根突出之前诱导的黄瓜幼苗的耐寒性提高，表明该方法在实践中的应用可能性。讨论了这种处理对黄瓜耐寒性的积极反应。

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