Role of Proline in Mitigating the Deleterious Effects of Heat Stress in Chillies

Shahbazi Akram, C. M. Ayyub, M. Shahzad, A. Shahzad
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引用次数: 5

Abstract

Summary Chilli is a spicy crop which belongs to family Solanaceae. As a vegetable crop, it is considered as one of the major cultivated crops in the world seriously affected by the climatic changes, including elevation in temperature. Therefore, in this research various morpho-physiological characteristics of chilli were studied for heat tolerance under the influence of exogenous application of proline. This research was carried out in a growth room of the Institute of Horticultural Sciences, University of Agriculture, Faisalabad, Pakistan. Four chilli genotypes were evaluated under the applied conditions. Seeds were grown in plastic pots. Heat stress (40/32 ºC day and night temperature) was applied 30 days after the emergence. Foliar spray of proline (0, 5 and 10 mM) was applied during heat stress, and after 7 days of stress the plants were harvested. The results revealed that the inhibition of chilli growth by heat stress was successfully mediated by proline application. Morphological attributes such as the number of leaves per plant, root and shoot length, plant fresh and dry weight were reduced in response to heat stress, and physiological attributes such as photosynthetic rate, water use efficiency and chlorophyll contents were also reduced in response to heat stress, except transpiration rate and stomatal conductance, which increased under heat stress and showed recovery by proline application. Exogenous application of proline promoted tolerance against heat stress in chilli genotypes and enhanced growth. All the observed traits exhibited recovery in response to proline stimulus, indicating the role of proline in mitigating the consequences of heat stress. Recovery also depends on genetic capability of various cultivars.
脯氨酸在缓解辣椒热胁迫中的作用
辣椒是一种辣味作物,属于茄科。作为一种蔬菜作物,它被认为是世界上受气温升高等气候变化影响严重的主要栽培作物之一。因此,本研究对外源脯氨酸对辣椒耐热性的影响进行了多种形态生理特性的研究。这项研究是在巴基斯坦费萨拉巴德农业大学园艺科学研究所的一个生长室内进行的。在应用条件下对4种辣椒基因型进行了评价。种子在塑料盆里种植。热应激(40/32ºC昼夜温度)在羽化后30天施加。在热胁迫期间叶面喷施0、5和10 mM脯氨酸,胁迫7 d后收获植株。结果表明,脯氨酸的应用成功地介导了热胁迫对辣椒生长的抑制。除蒸腾速率和气孔导度在热胁迫下升高并通过脯氨酸处理恢复外,单株叶片数、根冠长、植株鲜重和干重等形态指标在热胁迫下降低,光合速率、水分利用效率和叶绿素含量等生理指标也在热胁迫下降低。外源应用脯氨酸可提高辣椒基因型对热胁迫的耐受性,促进辣椒生长。这些性状在脯氨酸刺激下均有恢复,说明脯氨酸在缓解热应激中的作用。恢复也取决于不同品种的遗传能力。
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