摘要
研究了不同光照强度对黑暗贮藏后的西瓜种苗质量及生理指标的影响。结果表明:从处理时间来看,短期黑暗(2 d)的西瓜幼苗在随后6 d的光照恢复中生长较好,而黑暗6 d的种苗在光照恢复过程中地上部干重和可溶性蛋白含量虽缓慢增加,但始终显著低于对照水平。从恢复时间看,短期光照恢复(2 d)降低了叶片电解质渗透率,其中80μmol.m-2.s-1的弱光恢复效果优于300μmol.m-2.s-1的正常光照;之后随着恢复时间延长(6 d),300μmol.m-2.s-1的处理显著降低了幼苗叶片的电解质渗透率,促进地上部物质迅速积累,种苗质量及生理活性都得到了明显的改善。由此可知,略高于光饱和点的弱光对由黑暗转入光下的西瓜幼苗具有明显的光保护和缓苗作用,但实际生产操作中应注意调控适宜的弱光恢复时间,及时转入正常光照下以保证种苗的恢复效率。
In order to facilitate the manipulation for stored seedlings,the effect of light intensity on physiological characteristics of watermelon after storage was investigated.The results showed that the growth and quality of watermelon seedlings with short-term darkness could be recovered close to control plants after 6 days＇ illumination.In contrast,plants with long-term darkness（stored for 6 days）showed significant differences from the control level,though their shoot dry weight and soluble protein increased slowly.During the course of short-term illumination（recovered for 2 days）,the electrolyte diosmosis declined,and the recovery was better at 80 ·m^-2·s^-1FD than at 300 ·m^-2·s^-1FD.After 6 days of illumination,soluble protein at 300 ·m^-2·s^-1FD accumulated and electrolyte leakage rate decreased rapidly,the ability and quality of physiological indexes gradually exceeds those in 80 ·m^-2·s^-1FD.These results showed that a low light illumination which approximate to the light compensate point of plants was benefit for the recovery of stored seedlings in very first days,but it＇s essential to definite a proper time range to ensure the matter accumulation and plant growth of plus seedlings after storage in darkness.
出处
《北方园艺》
CAS
北大核心
2010年第15期160-164,共5页
Northern Horticulture
基金
国家"863"计划重大资助项目(2006AA10A311)
上海市农业成果转化资助项目(093919N0600)
上海市教育委员会重点学科建设资助项目(B209)
关键词
光照强度
西瓜种苗
贮藏
恢复
light intensity
watermelon seedlings
storage
recovery
