摘要
以林业废弃物山核桃果皮中提取的胡桃醌0.06mg/L喷洒牡丹叶面为处理,探讨7—8月份胡桃醌对改善夏季大田生长的牡丹叶片光合性能和减轻光合抑制的效应.结果显示:处理后的牡丹叶片与对照相比,光合速率的Pn最高值分别提高10.5%和12.8%,8月份的Pn最高值比对照推迟1h在10∶00出现,光合午休大大减轻;叶片的气孔导度变化不大、但Ci明显下降;PSⅡ光化学效率Fv/Fm降低20%和26%;ΦPSⅡ下降18.1%和19.9%;在10∶00—13∶00点光照最强阶段,叶绿素qP分别下降10%和11.6%,NPQ分别上升17.3%和14.3%.结果表明,胡桃醌减轻了夏季强光对牡丹叶片叶绿体光合机构的伤害,提高了牡丹叶片对光能的利用率.
This paper studies the effects of the Juglone on improving the photosynthesis of the peony growing in the summer field, and alleviating the photosynthesis inhibition in the two months of July and August, by using the 0. 06mg/L Juglone extracted from the C. cathayensis exocarp, one kind of the forestry waste, to insufflate the peony leaf surface. The research results show that ,by comparing the peony leaf after procession with the control group, the Pn summit values of the photosynthetic rate improve by 10. 5% and 12. 8% respectively, and the photosynthesis noon-break is greatly shortened;the stomatal conductance variance of the leaf is not big, but the Ci content decreases significantly;the PSII photochemical efficiency of Fv/Fm reduces by 20% and 26% respectively; ΦPSII decreases by 18. 1% and 19. 9% respectively;between the time period 10 am and 1 pm, when the sunlight is the most sufficient, the contents of the chlorophyll qP decrease by 10% and 11. 6% respectively,and the contents of the NPQ increase by 17. 3% and 14. 3% respectively. The research results show that Juglone could greatly reduce the summer sunlight harm on the photosynthetic system of the peony leaf chloroplast, and improve the light utilization rate of the peony leaf.
出处
《合肥学院学报（自然科学版）》
2014年第1期63-66,72,共5页
Journal of Hefei University :Natural Sciences
基金
安徽省高校省级自然科学基金重点项目(KJ2010A293)
合肥学院人才基金项目(10RC03)基金资助
关键词
山核桃果皮
胡桃醌
牡丹
夏季
光合抑制
C. cathayensis Exocarp
Juglone
Peony
summer
photoinhibition
