持续盐胁迫对制干辣椒生长的影响

摘要

以改良佳线、赤峰板椒、日本金塔三个制干辣椒品种为材料，利用不同浓度的 NaHCO3从辣椒现蕾期开始进行持续胁迫处理，定期采样测定其生长与生理指标，以确定持续盐胁迫对制干辣椒生长的影响。研究结果表明：30 mmol·L －1、60 mmol·L －1NaHCO3短期胁迫一定程度上可以促进改良佳线和日本金塔的生长；30 mmol·L －1 NaHCO3胁迫可促进改良佳线与日本金塔叶绿素合成，60 mmol·L －1 NaHCO3胁迫下，日本金塔与改良佳线叶绿素含量没有明显下降；而在低浓度盐胁迫下赤峰板椒的生长和叶绿素合成已经受到抑制，90 mmol·L －1 NaHCO3胁迫下，三种辣椒生长和叶绿素合成均受到抑制；三种辣椒的丙二醛含量和质膜透性均随胁迫浓度的加重和时间的延长表现为上升的趋势，说明盐胁迫越重，胁迫时间越长，质膜受损伤的程度越高，改良佳线与日本金塔的上升幅度要小于赤峰板椒；NaHCO3胁迫下，三种辣椒脯氨酸含量均大于对照，并且叶片内脯氨酸的积累随胁迫强度的增加而增加。与赤峰板椒相比，改良佳线与日本金塔有较强的脯氨酸积累能力。综合分析得出，改良佳线与日本金塔耐盐性良好，赤峰板椒耐盐性弱。%Three dried pepper cultivars (Gailiangjiaxian ,Chifengbanjiao ,and Ribenjinta) were used in this paper to investigate the effects salt stress on the growth the pepper by employing continual NaHCO 3 treatments at four concentra-tions during the budding period .During the treatment ,growth indicators and physiological indexes were analyzed to de-termine the sensitivities of different varieties to alkaline salt .The results indicated that short-term salinity stresses by 30 mmol·L - 1 and 60 mmol·L - 1 NaHCO3 promoted the growth of Gailiangjiaxian and Ribenjinta .30 mmol·L - 1 NaHCO3 al-so promoted the chlorophyll content of Gailiangjiaxian and Ribenjinta .Under the 60 mmol·L - 1 NaHCO3 stress ,chloro-phyll content of Gailiangjiaxianand Ribenjinta were not decreased significantly .However ,under stress of low salt concen-tration ,the growth and chlorophyll content of Chifengbanjiao became decreased .Under 90 mmol·L - 1 NaHCO3 salinity stress ,the growth and chlorophyll contents of three dried pepper varieties were all inhibited .MDA contents and mem-brane permeability of these three varieties became increased with the increase of stress level ,which indicated the more serious the salt stress ,the heavier damage the plasma membrane suffered .Chifengbanjiao accumulated more MDA than Gailiangjiaxian and Ribenjinta by the same salt concentration .Under salt stress ,the proline content of stressed peppers leaf were higher than that of CK ,and the accumulation of proline content was increased with the increase of salt stress in -tensity .Gailiangjiaxian and Ribenjintahad had stronger capacity in proline accumulation than Chifengbanjiao .After all , the results indicated that Gailiangjiaxian and Ribenjinta possessed higher tolerance to salt than Chifengbanjiao .